In this study we are demonstrating the use of third harmonic generation (THG) and second harmonic generation (SHG) in dental sections to produce unique and high-resolution images. The porous structures and collagen within the dental sections greatly facilitate observation based on THG and SHG, respectively.
{"title":"Harmonic generation microscopy of dental sections","authors":"Chin-Jen Lin, F. Kao","doi":"10.1117/12.577285","DOIUrl":"https://doi.org/10.1117/12.577285","url":null,"abstract":"In this study we are demonstrating the use of third harmonic generation (THG) and second harmonic generation (SHG) in dental sections to produce unique and high-resolution images. The porous structures and collagen within the dental sections greatly facilitate observation based on THG and SHG, respectively.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131000947","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 Luo, Abbas Hosseini, Weiwei Liu, See Leang Chin
The backscattered fluorescence of nitrogen from long filaments generated by intense ultrafast Ti-sapphire laser pulses propagating in air is studied. It shows an exponential increase with increasing filament length, indicating amplified spontaneous emission (ASE).
{"title":"Lasing action in air induced by ultrafast laser filamentation","authors":"Qi Luo, Abbas Hosseini, Weiwei Liu, See Leang Chin","doi":"10.1364/OPN.15.9.000044","DOIUrl":"https://doi.org/10.1364/OPN.15.9.000044","url":null,"abstract":"The backscattered fluorescence of nitrogen from long filaments generated by intense ultrafast Ti-sapphire laser pulses propagating in air is studied. It shows an exponential increase with increasing filament length, indicating amplified spontaneous emission (ASE).","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133697576","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}
Pub Date : 2003-08-01DOI: 10.1109/QELS.2003.238386
I. Thomann, S. Diddams, A. Bartels, K. L. Corwin, N. Newbury, L. Hollberg, J. Nicholson, M. Yan
We present a Cr:forsterite ring laser producing 30 fs pulses at a 420 MHz repetition rate. The output is broadened in highly nonlinear fiber yielding spectra covering 1050-2200 nm. 02000 Optical Society of America OCIS codes: (060.45 10) Optical communications, (140.7090) Ultrafast lasers, (120.3940) Metrology We have developed a chromium-doped forsterite femtosecond ring laser that generates 30 fs pulses at a 420 ME-Iz repetition rate with -500 mW of average power. To our knowledge, this is the first ring configuration as well as the highest repetition rate yet reported for a femtosecond Cr:forsterite laser. The compact solid-state design and broad spectral output make this laser attractive for applications in the important 1.3-1.6 pm regime. Additional spectral broadening of the laser output in highly nonlinear optical fibers leads to supercontinuum generation, with the broadest spectra extending across an octave. The underlying optical frequency comb can be linked to existing optical frequency standards, thereby establishing a broad array of precisely known frequencies across the near infrared spectrum. Because of its importance for fiber-based communications [l], the 1.3-1.6 pm regime is a natural direction in whch to spread the new tools of femtosecond-laser-based frequency metrology [2-41. Towards this end, we have developed a high repetition rate, broadband Cr:forsterite femtosecond laser. Our laser consists of a compact, prismless 6-mirror ring cavity similar to earlier work with Tksapphire [5]. The repetition rate in this present configuration is 420 MHz, yet we believe it could readily be increased to 1 GHz. The pump is a 10 W Ytterbium fiber laser operating at 1075 nm. Intra-cavity dispersion compensation is provided by a combination of chirped and GTI (Gires-Tournois interferometer) mirrors. For the optimal dispersion compensation, we obtain a FWHM spectral width of 59 nm. This spectrum is shown as curve (iv) in Fig. l(a). External compression with chirped mirrors provides 30 fs pulses. The average power is 480 mW, implying a pulse energy of 1.1 nJ. 100
{"title":"A 420 MHz Cr:forsterite femtosecond ring laser and its use for continuum generation in the 1-2 micron range","authors":"I. Thomann, S. Diddams, A. Bartels, K. L. Corwin, N. Newbury, L. Hollberg, J. Nicholson, M. Yan","doi":"10.1109/QELS.2003.238386","DOIUrl":"https://doi.org/10.1109/QELS.2003.238386","url":null,"abstract":"We present a Cr:forsterite ring laser producing 30 fs pulses at a 420 MHz repetition rate. The output is broadened in highly nonlinear fiber yielding spectra covering 1050-2200 nm. 02000 Optical Society of America OCIS codes: (060.45 10) Optical communications, (140.7090) Ultrafast lasers, (120.3940) Metrology We have developed a chromium-doped forsterite femtosecond ring laser that generates 30 fs pulses at a 420 ME-Iz repetition rate with -500 mW of average power. To our knowledge, this is the first ring configuration as well as the highest repetition rate yet reported for a femtosecond Cr:forsterite laser. The compact solid-state design and broad spectral output make this laser attractive for applications in the important 1.3-1.6 pm regime. Additional spectral broadening of the laser output in highly nonlinear optical fibers leads to supercontinuum generation, with the broadest spectra extending across an octave. The underlying optical frequency comb can be linked to existing optical frequency standards, thereby establishing a broad array of precisely known frequencies across the near infrared spectrum. Because of its importance for fiber-based communications [l], the 1.3-1.6 pm regime is a natural direction in whch to spread the new tools of femtosecond-laser-based frequency metrology [2-41. Towards this end, we have developed a high repetition rate, broadband Cr:forsterite femtosecond laser. Our laser consists of a compact, prismless 6-mirror ring cavity similar to earlier work with Tksapphire [5]. The repetition rate in this present configuration is 420 MHz, yet we believe it could readily be increased to 1 GHz. The pump is a 10 W Ytterbium fiber laser operating at 1075 nm. Intra-cavity dispersion compensation is provided by a combination of chirped and GTI (Gires-Tournois interferometer) mirrors. For the optimal dispersion compensation, we obtain a FWHM spectral width of 59 nm. This spectrum is shown as curve (iv) in Fig. l(a). External compression with chirped mirrors provides 30 fs pulses. The average power is 480 mW, implying a pulse energy of 1.1 nJ. 100","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122427830","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}
C. Eichler, S. Schad, D. Hofstetter, W. Chow, S. Miller, A. Weimar, A. Lell, V. Harle
We studied the transient lateral mode behavior of a 2.25 µm wide InGaN/GaN-based laser diode. At the beginning of a 9 µs long current pulse, the diode heats up, undergoes a lateral mode transition and finally shows a beam steering due to lateral carrier diffusion.
{"title":"Microsecond timescale lateral mode dynamics in a narrow stripe ingan-laser","authors":"C. Eichler, S. Schad, D. Hofstetter, W. Chow, S. Miller, A. Weimar, A. Lell, V. Harle","doi":"10.1063/1.1691497","DOIUrl":"https://doi.org/10.1063/1.1691497","url":null,"abstract":"We studied the transient lateral mode behavior of a 2.25 µm wide InGaN/GaN-based laser diode. At the beginning of a 9 µs long current pulse, the diode heats up, undergoes a lateral mode transition and finally shows a beam steering due to lateral carrier diffusion.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123213786","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 poling characteristics of lithium niobate crystals under laser illumination are investigated. UV-radiation with a wavelength around 334.5 nm permanently decreases the coercive field of the crystal and can be used for domain patterning.
{"title":"Influence of illumination on the poling characteristics of lithium niobate crystals","authors":"M. Muller, M. Wengler, K. Buse","doi":"10.1063/1.1606504","DOIUrl":"https://doi.org/10.1063/1.1606504","url":null,"abstract":"The poling characteristics of lithium niobate crystals under laser illumination are investigated. UV-radiation with a wavelength around 334.5 nm permanently decreases the coercive field of the crystal and can be used for domain patterning.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121141190","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}
B.F. Aug, A. Loomis, D. Young, A. Stern, B. Felton, P. Daniels, D. J. Landers, D. Rathman, R. Heinrichs, R. Marino, D. G. Fouche, D. G. Kocher, J. Mooney, M. O'Brien, B. E. Player, B. Willard, J. Zayhowski
Lincoln Laboratory has developed 32 x 32-pixel ladar focal planes comprising silicon geiger-mode avalanche photodiodes and high-speed all-digital CMOS timing circuitry in each pixel. In Geiger mode operation, the APD can detect as little as a single photon, producing a digital CMOS-compatible voltage pulse. This pulse is used to stop a high-speed counter in the pixel circuit, thus digitizing the time of arrival of the optical pulse. This "photon-to-digital conversion" simultaneously achieves single-photon sensitivity and 0.5-ns timing. We discuss the development of these focal planes and present imagery from ladar systems that use them.
林肯实验室开发了32 x 32像素的雷达焦平面，包括硅盖革模式雪崩光电二极管和每个像素的高速全数字CMOS时序电路。在盖革模式下，APD可以检测到一个光子，产生一个数字cmos兼容的电压脉冲。该脉冲用于阻止像素电路中的高速计数器，从而将光脉冲的到达时间数字化。这种“光子到数字转换”同时实现了单光子灵敏度和0.5 ns定时。我们讨论了这些焦平面的发展，并介绍了使用它们的雷达系统的图像。
{"title":"Three-dimensional imaging with arrays of geiger-mode avalanche photodiodes","authors":"B.F. Aug, A. Loomis, D. Young, A. Stern, B. Felton, P. Daniels, D. J. Landers, D. Rathman, R. Heinrichs, R. Marino, D. G. Fouche, D. G. Kocher, J. Mooney, M. O'Brien, B. E. Player, B. Willard, J. Zayhowski","doi":"10.1117/12.532723","DOIUrl":"https://doi.org/10.1117/12.532723","url":null,"abstract":"Lincoln Laboratory has developed 32 x 32-pixel ladar focal planes comprising silicon geiger-mode avalanche photodiodes and high-speed all-digital CMOS timing circuitry in each pixel. In Geiger mode operation, the APD can detect as little as a single photon, producing a digital CMOS-compatible voltage pulse. This pulse is used to stop a high-speed counter in the pixel circuit, thus digitizing the time of arrival of the optical pulse. This \"photon-to-digital conversion\" simultaneously achieves single-photon sensitivity and 0.5-ns timing. We discuss the development of these focal planes and present imagery from ladar systems that use them.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121948974","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}
Pub Date : 2003-06-06DOI: 10.1109/QELS.2003.238377
R. Holzwarth, C. Gohle, M. Zimmermann, T. Udem, T.W. Mansch
Summary form only given. We explore the possibilities of frequency combs generated by femtosecond lasers in ultra high precision spectroscopy on atomic hydrogen at the 10/sup -14/ level and we have done fundamental tests of the fs frequency comb technique down to the 10/sup -21/ level. Further applications arise in the time domain where now the phase slip between carrier and envelope of such pulses can be controlled.
{"title":"Optical frequency metrology with femtosecond laser pulses","authors":"R. Holzwarth, C. Gohle, M. Zimmermann, T. Udem, T.W. Mansch","doi":"10.1109/QELS.2003.238377","DOIUrl":"https://doi.org/10.1109/QELS.2003.238377","url":null,"abstract":"Summary form only given. We explore the possibilities of frequency combs generated by femtosecond lasers in ultra high precision spectroscopy on atomic hydrogen at the 10/sup -14/ level and we have done fundamental tests of the fs frequency comb technique down to the 10/sup -21/ level. Further applications arise in the time domain where now the phase slip between carrier and envelope of such pulses can be controlled.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133032602","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}
Pub Date : 2003-06-06DOI: 10.1109/CLEO.2003.1297754
M. F. Pereira, A. Wacker
Nonequilibrium optical gain is computed for quantum cascade lasers. The Greens functions theory consistently treats transport and optics with the same microscopic footing, incorporating design details of the structure and many particle effects.
{"title":"Many particle theory for optical gain in quantum cascade lasers","authors":"M. F. Pereira, A. Wacker","doi":"10.1109/CLEO.2003.1297754","DOIUrl":"https://doi.org/10.1109/CLEO.2003.1297754","url":null,"abstract":"Nonequilibrium optical gain is computed for quantum cascade lasers. The Greens functions theory consistently treats transport and optics with the same microscopic footing, incorporating design details of the structure and many particle effects.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114849381","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 report polarization switching in a monolithic dual-resonator vertical-cavity laser. The light output from the top ion-implanted cavity under forward bias above threshold is partitioned into two orthogonal polarizations of the fundamental transverse mode. A reverse bias of sufficient magnitude applied to the bottom oxide-confined cavity causes the abrupt suppression of the dominant polarization and simultaneous emergence of the orthogonal polarization. We find that the electro-optic birefringence of the two polarizations increases with increasing reverse bias. We show that the mechanism of the polarization switch is consistent with wavelength-dependent loss from electroabsorption in the reverse-biased quantum wells of the oxide-confined cavity.
{"title":"Polarization switching in composite resonator vertical cavity lasers","authors":"D. Grasso, A. C. Lehman, K. Choquette","doi":"10.1063/1.1636266","DOIUrl":"https://doi.org/10.1063/1.1636266","url":null,"abstract":"We report polarization switching in a monolithic dual-resonator vertical-cavity laser. The light output from the top ion-implanted cavity under forward bias above threshold is partitioned into two orthogonal polarizations of the fundamental transverse mode. A reverse bias of sufficient magnitude applied to the bottom oxide-confined cavity causes the abrupt suppression of the dominant polarization and simultaneous emergence of the orthogonal polarization. We find that the electro-optic birefringence of the two polarizations increases with increasing reverse bias. We show that the mechanism of the polarization switch is consistent with wavelength-dependent loss from electroabsorption in the reverse-biased quantum wells of the oxide-confined cavity.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134490327","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}
M. Shih, W. Kuang, J.R. Cao, S. Choi, J. O'Brien, P. Dapkus
Mach-Zehnder interferometers were fabricated from suspended membrane photonic crystal waveguides. Transmission spectra were measured and device operation was shown to be in agreement with theoretical predictions.
{"title":"Two-dimensional photonic crystal Mach-Zehnder interferometers","authors":"M. Shih, W. Kuang, J.R. Cao, S. Choi, J. O'Brien, P. Dapkus","doi":"10.1063/1.1642758","DOIUrl":"https://doi.org/10.1063/1.1642758","url":null,"abstract":"Mach-Zehnder interferometers were fabricated from suspended membrane photonic crystal waveguides. Transmission spectra were measured and device operation was shown to be in agreement with theoretical predictions.","PeriodicalId":432096,"journal":{"name":"Conference on Lasers and Electro-Optics, 2003. CLEO '03.","volume":"294 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126783164","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：