Kenan Wu, Yang Sun, Y. Huai, Shuqin Jia, Xi Chen, Yuqi Jin
Unstable resonator with nonuniform magnification for improving the beam uniformity of chemical oxygen iodine lasers is explored for the first time. The magnification of the resonator is a function of the radial coordinate of the polar coordinate system on the front mirror surface. A resonator was designed to have a lower magnification at the center of the resonator than at the edge. The resonator consists of two aspherical mirrors. Method for designing the resonator is given. The energy conservation law and the aplanatic condition were used to derive the designing principle of the two aspherical mirrors. The design result was fitted to polynomial form which is suitable for manufacturing. Numerical experiment was carried out to evaluate the performance of the resonator. The computation was based on coupled simulation of wave optics model and computational fluid mechanics model. Results proved the effectiveness of the design method. The design tends to enhance the intensity near the center of the output beam and cripple that near the edge. Further analysis revealed that this effect is induced because rays of light are reflected more densely at the center of the pupil than at the edge. Therefore, this design affords for a potential approach for improving the near field uniformity of chemical oxygen iodine lasers.
{"title":"Optical resonator with nonuniform magnification for improving beam uniformity of chemical oxygen iodine lasers","authors":"Kenan Wu, Yang Sun, Y. Huai, Shuqin Jia, Xi Chen, Yuqi Jin","doi":"10.1117/12.2065283","DOIUrl":"https://doi.org/10.1117/12.2065283","url":null,"abstract":"Unstable resonator with nonuniform magnification for improving the beam uniformity of chemical oxygen iodine lasers is explored for the first time. The magnification of the resonator is a function of the radial coordinate of the polar coordinate system on the front mirror surface. A resonator was designed to have a lower magnification at the center of the resonator than at the edge. The resonator consists of two aspherical mirrors. Method for designing the resonator is given. The energy conservation law and the aplanatic condition were used to derive the designing principle of the two aspherical mirrors. The design result was fitted to polynomial form which is suitable for manufacturing. Numerical experiment was carried out to evaluate the performance of the resonator. The computation was based on coupled simulation of wave optics model and computational fluid mechanics model. Results proved the effectiveness of the design method. The design tends to enhance the intensity near the center of the output beam and cripple that near the edge. Further analysis revealed that this effect is induced because rays of light are reflected more densely at the center of the pupil than at the edge. Therefore, this design affords for a potential approach for improving the near field uniformity of chemical oxygen iodine lasers.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"519 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132322875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A single-mode single frequency eye-safe pulsed all fiber laser based on master oscillator power amplification structure is presented. This laser is composed of a narrow linewidth distributed laser diode seed laser and two-stage cascade amplifiers. 0.8 m longitudinally gradient strained erbium/ytterbium co-doped polarization-maintaining fiber with a core diameter of 10 μm is used as the gain fiber and two acoustic-optics modulators are adopted to enhance pulse extinction ratio. A peak power of 160 W and a pulse width of 200 ns at 10 kHz repetition rate are achieved with transform-limited linewidth and diffraction-limited beam quality. This laser will be employed in a compact short range coherent Doppler wind lidar.
{"title":"1540-nm single frequency single-mode pulsed all fiber laser for coherent Doppler lidar","authors":"Xin Zhang, Weifeng Diao, Yuan Liu, Jiqiao Liu, X. Hou, Weibiao Chen","doi":"10.1117/12.2064725","DOIUrl":"https://doi.org/10.1117/12.2064725","url":null,"abstract":"A single-mode single frequency eye-safe pulsed all fiber laser based on master oscillator power amplification structure is presented. This laser is composed of a narrow linewidth distributed laser diode seed laser and two-stage cascade amplifiers. 0.8 m longitudinally gradient strained erbium/ytterbium co-doped polarization-maintaining fiber with a core diameter of 10 μm is used as the gain fiber and two acoustic-optics modulators are adopted to enhance pulse extinction ratio. A peak power of 160 W and a pulse width of 200 ns at 10 kHz repetition rate are achieved with transform-limited linewidth and diffraction-limited beam quality. This laser will be employed in a compact short range coherent Doppler wind lidar.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134377057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rujian Xiang, Kai Zhang, Jing Wu, Yinglei Du, Zhong-yong Luo, Zhong He, Honglai Xu
The wavefront of the output high power laser beam generated by a MOPA laser system with slab gain medium was measured and analyzed by an H-S wavefront sensor, the wavefront measured consisted the static aberration of the whole optic chain and the dynamic component caused by the laser driver. Analyzing results showed that the temporal frequency of the beam aberration was mostly less than 10Hz, but the spatial distribution of the aberration was more challengeable to the phase compensation. Due to the narrow rectangle shape of the laser gain medium and the none uniformity of the pumping and cooling, it had some local big slope cross the beam section, that caused a lot of difficulties to the aberration measuring and wavefront correcting, there were many high order components in the wide direction cross the beam, but the phase aberration was more smooth in the vertical direction. A beam expander which has different ratio in the x/y directions had been used for matching the beam aperture and the valid controlling range of the deformable mirror. An adaptive optical system consisted of an H-S wavefront sensor and a deformable mirror (DM) with 67 valid actuators which arranged in two dimensions as hexagon designed to compensate the phase aberration. The driving vector of the deformable mirror was calculated from the spot array which sampled by the H-S wavefront sensor from the target beam, the surface response of all actuators were pre-calibrated and saved as a matrix. The matrix invert method was used to calculate the driving vectors in the close loop steps. The beam quality factor β was adapted to evaluate the output beam from the adaptive optical system. Simulation and experiment results of the close loop correction about the adaptive optical system showed that the aberration was compensated to a very low level and the far field beam quality of the high power laser could reach 1.67xDL.
{"title":"Beam quality active control of a slab MOPA solid state laser","authors":"Rujian Xiang, Kai Zhang, Jing Wu, Yinglei Du, Zhong-yong Luo, Zhong He, Honglai Xu","doi":"10.1117/12.2065448","DOIUrl":"https://doi.org/10.1117/12.2065448","url":null,"abstract":"The wavefront of the output high power laser beam generated by a MOPA laser system with slab gain medium was measured and analyzed by an H-S wavefront sensor, the wavefront measured consisted the static aberration of the whole optic chain and the dynamic component caused by the laser driver. Analyzing results showed that the temporal frequency of the beam aberration was mostly less than 10Hz, but the spatial distribution of the aberration was more challengeable to the phase compensation. Due to the narrow rectangle shape of the laser gain medium and the none uniformity of the pumping and cooling, it had some local big slope cross the beam section, that caused a lot of difficulties to the aberration measuring and wavefront correcting, there were many high order components in the wide direction cross the beam, but the phase aberration was more smooth in the vertical direction. A beam expander which has different ratio in the x/y directions had been used for matching the beam aperture and the valid controlling range of the deformable mirror. An adaptive optical system consisted of an H-S wavefront sensor and a deformable mirror (DM) with 67 valid actuators which arranged in two dimensions as hexagon designed to compensate the phase aberration. The driving vector of the deformable mirror was calculated from the spot array which sampled by the H-S wavefront sensor from the target beam, the surface response of all actuators were pre-calibrated and saved as a matrix. The matrix invert method was used to calculate the driving vectors in the close loop steps. The beam quality factor β was adapted to evaluate the output beam from the adaptive optical system. Simulation and experiment results of the close loop correction about the adaptive optical system showed that the aberration was compensated to a very low level and the far field beam quality of the high power laser could reach 1.67xDL.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"9255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130855080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this research, the formation of laser-induced periodic surface structures (LIPSS) on the nickel surface by femtosecond laser pulses was investigated. In the experiment, we used a commercially available amplified Ti:sapphire laser system that generated 164 fs laser pulses with a maximum pulse energy (Ep) of 1 mJ at a 1 kHz repetition rate and with a central wavelength λ= 780 nm. To obtain a fine periodic ordering of surface nanostructures, the laser beam, through a 0.2 mm pinhole aperture positioned near the 10× objective lens, was focused onto the sample. The samples were mounted on an XYZ-translation stage and irradiated in static and line-scanning experiment. The morphology of the induced periodic structure was examined by scanning electron microscopy. The surface profile was measured by atomic force microscopy. LIPSS with a period of around 700 nm entirely covered the irradiated area. Large area of LIPSS in the nickel surface was produced in line-scanning experiment. The mechanism of the formation of LIPSS in the entire irradiated area in static irradiation was discussed. The function of a 0.2 mm pinhole aperture was studied. The regular LIPSS on the nickel surface changed the optical property of the surface. The regular LIPSS on nickel surface could be also applied on the micro-mould fabrication.
{"title":"Regular sub-wavelength surface structures induced by femtosecond laser pulses on nickel","authors":"L. Qi","doi":"10.1117/12.2063875","DOIUrl":"https://doi.org/10.1117/12.2063875","url":null,"abstract":"In this research, the formation of laser-induced periodic surface structures (LIPSS) on the nickel surface by femtosecond laser pulses was investigated. In the experiment, we used a commercially available amplified Ti:sapphire laser system that generated 164 fs laser pulses with a maximum pulse energy (Ep) of 1 mJ at a 1 kHz repetition rate and with a central wavelength λ= 780 nm. To obtain a fine periodic ordering of surface nanostructures, the laser beam, through a 0.2 mm pinhole aperture positioned near the 10× objective lens, was focused onto the sample. The samples were mounted on an XYZ-translation stage and irradiated in static and line-scanning experiment. The morphology of the induced periodic structure was examined by scanning electron microscopy. The surface profile was measured by atomic force microscopy. LIPSS with a period of around 700 nm entirely covered the irradiated area. Large area of LIPSS in the nickel surface was produced in line-scanning experiment. The mechanism of the formation of LIPSS in the entire irradiated area in static irradiation was discussed. The function of a 0.2 mm pinhole aperture was studied. The regular LIPSS on the nickel surface changed the optical property of the surface. The regular LIPSS on nickel surface could be also applied on the micro-mould fabrication.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133597483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Tian, Hong Yan, Li Chen, Yidong Ye, Jianming Li, Jiawen Luo, Fei Lu
Spectral beam combination (SBC) is a promising method to combine multiple fiber outputs for further power scaling with the capability of maintaining high beam quality, but the beam quality will be degraded with spectral linewidth broadening, because it could result in additional angular spread in the output beam. In this paper, we described theoretical calculation as well as experimental investigation on the influence of spectral linewidth broadening on beam quality. The results show that in single SBC system the spectral linewidth should be limited to less than a few GHz in order to avoid beam quality degradation, but the linewidth requirement could be decreased to more than hundreds of GHz using a pair of parallel gratings, which reveals a feasible way to increase the stimulated Brillouin scattering (SBS)-free power output of single fiber laser for overall output scaling and high beam quality.
{"title":"Investigation on the influence of spectral linewidth broadening on beam quality in spectral beam combination","authors":"F. Tian, Hong Yan, Li Chen, Yidong Ye, Jianming Li, Jiawen Luo, Fei Lu","doi":"10.1117/12.2065455","DOIUrl":"https://doi.org/10.1117/12.2065455","url":null,"abstract":"Spectral beam combination (SBC) is a promising method to combine multiple fiber outputs for further power scaling with the capability of maintaining high beam quality, but the beam quality will be degraded with spectral linewidth broadening, because it could result in additional angular spread in the output beam. In this paper, we described theoretical calculation as well as experimental investigation on the influence of spectral linewidth broadening on beam quality. The results show that in single SBC system the spectral linewidth should be limited to less than a few GHz in order to avoid beam quality degradation, but the linewidth requirement could be decreased to more than hundreds of GHz using a pair of parallel gratings, which reveals a feasible way to increase the stimulated Brillouin scattering (SBS)-free power output of single fiber laser for overall output scaling and high beam quality.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"539 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132436309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We designed one 6 degrees of freedom (DOF) parallel platform to track and observe in a certain range according to requirements of a telescope. First of all, considering about the application requirements of telescope, we determined the specific structure. After that we carried on theoretical analysis about kinematics and dynamics of the platform. Then, we build parameterized 3D model and optimized it with Adams software to ensure the platform to achieve best dynamic performance and minimum space size. Finally we did co-simulation making use of Adams and Simulink software (Matlab) to observe the platform’s tracing ability. And we analyzed the factors affecting the tracking error.
{"title":"Study about the 6-DOF parallel tracking platform","authors":"S. Tan, G. Ren, Y. Tan","doi":"10.1117/12.2065342","DOIUrl":"https://doi.org/10.1117/12.2065342","url":null,"abstract":"We designed one 6 degrees of freedom (DOF) parallel platform to track and observe in a certain range according to requirements of a telescope. First of all, considering about the application requirements of telescope, we determined the specific structure. After that we carried on theoretical analysis about kinematics and dynamics of the platform. Then, we build parameterized 3D model and optimized it with Adams software to ensure the platform to achieve best dynamic performance and minimum space size. Finally we did co-simulation making use of Adams and Simulink software (Matlab) to observe the platform’s tracing ability. And we analyzed the factors affecting the tracking error.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114321158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Qi-qi Hu, Zhi-Meng Huang, Xuan Tang, Yong-quan Luo, Da-yong Zhang
Active coherent beam combination has been a hot area of research for several years. Particular algorithm module is used to stabilize the phase difference between beamlets, and make them coherent. The phase noise increases with the raising power of laser output. Under low power condition, we simulate the phase noise of high power laser amplifier by the Arbitrary Function Generators (AFGs), and send them to the phase modulators to destabilize the phase, to test the performance of the phase lock algorithm. The experimental results show the feasibility.
{"title":"Simulation of phase noise for coherent beam combination","authors":"Qi-qi Hu, Zhi-Meng Huang, Xuan Tang, Yong-quan Luo, Da-yong Zhang","doi":"10.1117/12.2065300","DOIUrl":"https://doi.org/10.1117/12.2065300","url":null,"abstract":"Active coherent beam combination has been a hot area of research for several years. Particular algorithm module is used to stabilize the phase difference between beamlets, and make them coherent. The phase noise increases with the raising power of laser output. Under low power condition, we simulate the phase noise of high power laser amplifier by the Arbitrary Function Generators (AFGs), and send them to the phase modulators to destabilize the phase, to test the performance of the phase lock algorithm. The experimental results show the feasibility.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114801694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study results of a high-quality radiation formation in the UV and IR spectral ranges for using in lidar systems to detect the vapors of nitric oxide and complex molecules, including data radicals, are discussed. The influence of the existing cavity losses on the radiation formation in the dispersion cavity is studied.The development of KrF laser with a broad spectral band adjustment of 247.5-249.5 nm and high energy are presented about. The possibility of pulse formation with duration of 30 ns in CO2 laser is shown.
{"title":"Peculiarities of radiation formation in laser systems for remote sensing","authors":"Y. Panchenko, M. Andreev, V. Losev, A. Puchikin","doi":"10.1117/12.2065352","DOIUrl":"https://doi.org/10.1117/12.2065352","url":null,"abstract":"The study results of a high-quality radiation formation in the UV and IR spectral ranges for using in lidar systems to detect the vapors of nitric oxide and complex molecules, including data radicals, are discussed. The influence of the existing cavity losses on the radiation formation in the dispersion cavity is studied.The development of KrF laser with a broad spectral band adjustment of 247.5-249.5 nm and high energy are presented about. The possibility of pulse formation with duration of 30 ns in CO2 laser is shown.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115126355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper proposes and implements a standard interface of miniaturized high-speed image storage system, which combines PowerPC with FPGA and utilizes PCIE bus as the high speed switching channel. Attached to the PowerPC, mSATA interface SSD(Solid State Drive) realizes RAID3 array storage. At the same time, a high-speed real-time image compression patent IP core also can be embedded in FPGA, which is in the leading domestic level with compression rate and image quality, making that the system can record higher image data rate or achieve longer recording time. The notebook memory card buckle type design is used in the mSATA interface SSD, which make it possible to complete the replacement in 5 seconds just using single hand, thus the total length of repeated recordings is increased. MSI (Message Signaled Interrupts) interruption guarantees the stability and reliability of continuous DMA transmission. Furthermore, only through the gigabit network, the remote display, control and upload to backup function can be realized. According to an optional 25 frame/s or 30 frame/s, upload speeds can be up to more than 84 MB/s. Compared with the existing FLASH array high-speed memory systems, it has higher degree of modularity, better stability and higher efficiency on development, maintenance and upgrading. Its data access rate is up to 300MB/s, realizing the high speed image storage system miniaturization, standardization and modularization, thus it is fit for image acquisition, storage and real-time transmission to server on mobile equipment.
本文提出并实现了一种将PowerPC与FPGA相结合，利用PCIE总线作为高速交换通道的小型化高速图像存储系统的标准接口。安装在PowerPC上的mSATA接口SSD(Solid State Drive)实现RAID3阵列存储。同时，FPGA中还可嵌入高速实时图像压缩专利IP核，压缩率和图像质量均处于国内领先水平，使系统可以记录更高的图像数据率或实现更长的记录时间。mSATA接口SSD采用笔记本内存卡扣式设计，单手5秒即可完成更换，从而增加了重复记录的总长度。MSI(消息信号中断)中断保证了连续DMA传输的稳定性和可靠性。此外，只有通过千兆网络，才能实现远程显示、控制和上传备份功能。根据可选的25帧/s或30帧/s，上传速度可达84 MB/s以上。与现有的FLASH阵列高速存储系统相比，它具有更高的模块化程度、更好的稳定性和更高的开发、维护和升级效率。其数据访问速率可达300MB/s，实现了高速图像存储系统的小型化、标准化和模块化，适用于移动设备上的图像采集、存储和实时传输到服务器。
{"title":"PCIE interface design for high-speed image storage system based on SSD","authors":"Shiming Wang","doi":"10.1117/12.2065366","DOIUrl":"https://doi.org/10.1117/12.2065366","url":null,"abstract":"This paper proposes and implements a standard interface of miniaturized high-speed image storage system, which combines PowerPC with FPGA and utilizes PCIE bus as the high speed switching channel. Attached to the PowerPC, mSATA interface SSD(Solid State Drive) realizes RAID3 array storage. At the same time, a high-speed real-time image compression patent IP core also can be embedded in FPGA, which is in the leading domestic level with compression rate and image quality, making that the system can record higher image data rate or achieve longer recording time. The notebook memory card buckle type design is used in the mSATA interface SSD, which make it possible to complete the replacement in 5 seconds just using single hand, thus the total length of repeated recordings is increased. MSI (Message Signaled Interrupts) interruption guarantees the stability and reliability of continuous DMA transmission. Furthermore, only through the gigabit network, the remote display, control and upload to backup function can be realized. According to an optional 25 frame/s or 30 frame/s, upload speeds can be up to more than 84 MB/s. Compared with the existing FLASH array high-speed memory systems, it has higher degree of modularity, better stability and higher efficiency on development, maintenance and upgrading. Its data access rate is up to 300MB/s, realizing the high speed image storage system miniaturization, standardization and modularization, thus it is fit for image acquisition, storage and real-time transmission to server on mobile equipment.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"134 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117328736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yujun Feng, Xiao-Jun Wang, Weiwei Ke, Yinhong Sun, Kai Zhang, Yi Ma, Tenglong Li, Yanshan Wang, Juan Wu
For powers exceeding a threshold the spectral broadening in fiber amplifiers becomes a significant challenge for the development of high power narrow bandwidth fiber lasers. In this letter, we show that the spectral broadening can be partly caused by four-wave mixing(FWM) process in which the power of the central wavelength would transfer to the side ones. A practical FWM induced spectral broadening theory has been derived from the early works. A numerical model of fiber amplifier has been established and FWM process has been added to the model. During the simulation process, we find that when a 10 GHz, several watts narrow bandwidth laser is seeded into a few modes fiber laser amplifier, the FWM induced spectral broadening effect might continually increase the FWHM of the spectra of the continuum laser to 100 GHz within the amplification process to several hundred watts which has been convinced by our experiments. Some other results have also been analyzed in this paper to complete the four-wave mixing induced spectral broadening theory in fiber amplifiers.
{"title":"Numerical analysis to four-wave mixing induced spectral broadening in high power fiber lasers","authors":"Yujun Feng, Xiao-Jun Wang, Weiwei Ke, Yinhong Sun, Kai Zhang, Yi Ma, Tenglong Li, Yanshan Wang, Juan Wu","doi":"10.1117/12.2065493","DOIUrl":"https://doi.org/10.1117/12.2065493","url":null,"abstract":"For powers exceeding a threshold the spectral broadening in fiber amplifiers becomes a significant challenge for the development of high power narrow bandwidth fiber lasers. In this letter, we show that the spectral broadening can be partly caused by four-wave mixing(FWM) process in which the power of the central wavelength would transfer to the side ones. A practical FWM induced spectral broadening theory has been derived from the early works. A numerical model of fiber amplifier has been established and FWM process has been added to the model. During the simulation process, we find that when a 10 GHz, several watts narrow bandwidth laser is seeded into a few modes fiber laser amplifier, the FWM induced spectral broadening effect might continually increase the FWHM of the spectra of the continuum laser to 100 GHz within the amplification process to several hundred watts which has been convinced by our experiments. Some other results have also been analyzed in this paper to complete the four-wave mixing induced spectral broadening theory in fiber amplifiers.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124820925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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