J. Parker, M. Nutter, J. Hayden, S. Singer, I. Liberman
As the only well developed laser system potentially suitable for a laser fusion power system, it is critical that the feasibility of fusion induced by CO2 laser pulses be demonstrated. For the next 2 years (until the 10-kJ 8-beam system at LASL becomes operational), the principal tool for carrying out these investigations will be the Dual Beam Laser System (DBLS). Designed primarily as a prototype for the four modules that will comprise the 10-kJ laser system, DBLS has been upgraded to an experimental target facility by the addition of a high-contrast short-pulse oscillator and the necessary target diagnostic and handling equipment. With target experiments scheduled to begin in the spring of 1976, the DBLS is currently undergoing evaluation to establish its short-pulse performance characteristics.
{"title":"Two-beam CO2 laser system for laser induced fusion experiments","authors":"J. Parker, M. Nutter, J. Hayden, S. Singer, I. Liberman","doi":"10.1364/cleos.1976.wg2","DOIUrl":"https://doi.org/10.1364/cleos.1976.wg2","url":null,"abstract":"As the only well developed laser system potentially suitable for a laser fusion power system, it is critical that the feasibility of fusion induced by CO2 laser pulses be demonstrated. For the next 2 years (until the 10-kJ 8-beam system at LASL becomes operational), the principal tool for carrying out these investigations will be the Dual Beam Laser System (DBLS). Designed primarily as a prototype for the four modules that will comprise the 10-kJ laser system, DBLS has been upgraded to an experimental target facility by the addition of a high-contrast short-pulse oscillator and the necessary target diagnostic and handling equipment. With target experiments scheduled to begin in the spring of 1976, the DBLS is currently undergoing evaluation to establish its short-pulse performance characteristics.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134461044","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 laser amplifier, rod or disk, has a well defined aperture that limits the diameter of the beam. If one attempts to fill this entire aperture with useful energy, the interaction of the beam with the hard limiting aperture produces Fresnel diffraction rings at the edge which will propagate throughout the beam. These diffraction rings will be amplified by later amplifiers, resulting in intensity modulation detrimental to the beam propagation and even initiating self-focusing with consequent damage to optical components.
{"title":"KMSF laser subsystems","authors":"N. Moncur, B. Guscott, J. Hildum","doi":"10.1364/cleos.1976.thd2","DOIUrl":"https://doi.org/10.1364/cleos.1976.thd2","url":null,"abstract":"A laser amplifier, rod or disk, has a well defined aperture that limits the diameter of the beam. If one attempts to fill this entire aperture with useful energy, the interaction of the beam with the hard limiting aperture produces Fresnel diffraction rings at the edge which will propagate throughout the beam. These diffraction rings will be amplified by later amplifiers, resulting in intensity modulation detrimental to the beam propagation and even initiating self-focusing with consequent damage to optical components.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":" 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133017988","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}
Results of recent experiments involving guided optical waves and surface acoustic waves have demonstrated that it is possible to achieve very efficient interaction with noncollinear, coplanar Bragg diffraction in LiNbO3 substrate.1 Efficient diffraction results from the fact that both the optical and the SAW are confined in one dimension and that the frequency range of the SAW may be chosen to facilitate a good matching between the confinement of the optical waves and the penetration depth of the SAW. In particular, by employing multiple surface acoustic waves (Fig. 1), deflectors with very large diffraction efficiency-bandwidth product and excellent beam quality have been realized most recently. 1 For example, the frequency response and the light beam quality of a deflector, which has a 360-MHz bandwidth,2 are shown in Figs. 2 and 3, respectively. Total electric drive power of only 200 mW was required to diffract 50% of the incident light power. This particular deflector has deflected a light beam of a 4-mm aperture into 400 resolvable spots at a random-access switching time of 1.24 μsec. The above combination of performance figures far exceeds that obtained previously. It should be possible to achieve even better performance figures by optimizing the optical waveguide and surface acoustic wave parameters.
{"title":"High-performance guided-wave acoustooptic beam deflectors","authors":"C. Tsai","doi":"10.1364/cleos.1976.wd3","DOIUrl":"https://doi.org/10.1364/cleos.1976.wd3","url":null,"abstract":"Results of recent experiments involving guided optical waves and surface acoustic waves have demonstrated that it is possible to achieve very efficient interaction with noncollinear, coplanar Bragg diffraction in LiNbO3 substrate.1 Efficient diffraction results from the fact that both the optical and the SAW are confined in one dimension and that the frequency range of the SAW may be chosen to facilitate a good matching between the confinement of the optical waves and the penetration depth of the SAW. In particular, by employing multiple surface acoustic waves (Fig. 1), deflectors with very large diffraction efficiency-bandwidth product and excellent beam quality have been realized most recently. 1 For example, the frequency response and the light beam quality of a deflector, which has a 360-MHz bandwidth,2 are shown in Figs. 2 and 3, respectively. Total electric drive power of only 200 mW was required to diffract 50% of the incident light power. This particular deflector has deflected a light beam of a 4-mm aperture into 400 resolvable spots at a random-access switching time of 1.24 μsec. The above combination of performance figures far exceeds that obtained previously. It should be possible to achieve even better performance figures by optimizing the optical waveguide and surface acoustic wave parameters.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133385137","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}
Digitally controlled ground electrooptical systems have been designed such that all possible total system uncertainties are accounted for prior to track. The definition of total system here encompasses the satellite, earth, and station as a whole measured to common references. Considerations include utilizing stabilized oscillators to generate compensated Universal Time (UTC) thus reducing system time uncertainties to less than 2 μsec, reducing pointing uncertainties to less than 1 sec of arc with 21-bit encoders and knowledge of station geodetic location to within a small number of feet. Sensor biases and errors both static and dynamic are removed or modeled prior to track. Initially this is accomplished through a precise static (moving at sidereal rates) calibration of the mount to the celestial sphere. Data on several hundred stars are resident in the computer, and where specific stars are selected the system will continually point open loop to that reference as angular deviations are measured. With sufficient observations of a sampled distribution of known stars, the modeling constants are computed and the entire process repeated until angular deviations are zero. Slew measurements are made to determine dynamic constants. The system is then used to track known satellites and over-all system performance observed to insure that modeling is correct. A generalized block diagram is shown in Fig. 1.
{"title":"Computer controlled ground electrooptical systems for deep space operations","authors":"E. P. Schelonka","doi":"10.1364/cleos.1976.tuc1","DOIUrl":"https://doi.org/10.1364/cleos.1976.tuc1","url":null,"abstract":"Digitally controlled ground electrooptical systems have been designed such that all possible total system uncertainties are accounted for prior to track. The definition of total system here encompasses the satellite, earth, and station as a whole measured to common references. Considerations include utilizing stabilized oscillators to generate compensated Universal Time (UTC) thus reducing system time uncertainties to less than 2 μsec, reducing pointing uncertainties to less than 1 sec of arc with 21-bit encoders and knowledge of station geodetic location to within a small number of feet. Sensor biases and errors both static and dynamic are removed or modeled prior to track. Initially this is accomplished through a precise static (moving at sidereal rates) calibration of the mount to the celestial sphere. Data on several hundred stars are resident in the computer, and where specific stars are selected the system will continually point open loop to that reference as angular deviations are measured. With sufficient observations of a sampled distribution of known stars, the modeling constants are computed and the entire process repeated until angular deviations are zero. Slew measurements are made to determine dynamic constants. The system is then used to track known satellites and over-all system performance observed to insure that modeling is correct. A generalized block diagram is shown in Fig. 1.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133883115","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 reports on an intracavity CdTe electrooptic modulator being developed for a 10.6-µm transmitter operating at 300 Mbps between low altitude and synchronous satellites. As the transmitter laser is a waveguide CO2 device,1 a waveguide mode of propagation in the modulator rod is used for optical confinement.2 This design, shown in Fig. 1, is a modification of the open resonator structure with an intracavity lens used in conventional transmitters. The waveguide configuration removes the limit on modulator length imposed by open resonator diffraction, eliminates the safety factor in the transverse dimension of the rod, and avoids loss arising from the intracavity lens.
{"title":"Waveguide electrooptic modulator for CO2 lasers","authors":"F. Goodwin, D. Henderson, A. Reiss, J. Wilkerson","doi":"10.1364/cleos.1976.thb4","DOIUrl":"https://doi.org/10.1364/cleos.1976.thb4","url":null,"abstract":"This paper reports on an intracavity CdTe electrooptic modulator being developed for a 10.6-µm transmitter operating at 300 Mbps between low altitude and synchronous satellites. As the transmitter laser is a waveguide CO2 device,1 a waveguide mode of propagation in the modulator rod is used for optical confinement.2 This design, shown in Fig. 1, is a modification of the open resonator structure with an intracavity lens used in conventional transmitters. The waveguide configuration removes the limit on modulator length imposed by open resonator diffraction, eliminates the safety factor in the transverse dimension of the rod, and avoids loss arising from the intracavity lens.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121295056","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 are presently completing a CO2 laser designed to produce peak power in excess of 2 TW to study the scaling characteristics of pellets for laser induced fusion. The design goal of 2500 J in a 1 nsec pulse also includes other requirements, among them being that the energy on the target before the arrival of the main pulse be kept under 100 μJ. This requirement is needed to prevent the target from disintegrating before the TW pulse can compress it. Since the small signal gain in the dual-beam triple-pass amplifier is estimated to be about 108, the prepulse energy from the oscillator–preamplifier feeding the final amplifier must be less than 10−12 J. Since about 0.2 J is required to drive each half of the dual beam module, a prepulse rejection ratio better than 4 × 1011 must be achieved.
{"title":"Prepulse elimination in high-power CO2 lasers","authors":"I. Liberman, J. Hayden, S. Singer","doi":"10.1364/cleos.1976.wg5","DOIUrl":"https://doi.org/10.1364/cleos.1976.wg5","url":null,"abstract":"We are presently completing a CO2 laser designed to produce peak power in excess of 2 TW to study the scaling characteristics of pellets for laser induced fusion. The design goal of 2500 J in a 1 nsec pulse also includes other requirements, among them being that the energy on the target before the arrival of the main pulse be kept under 100 μJ. This requirement is needed to prevent the target from disintegrating before the TW pulse can compress it. Since the small signal gain in the dual-beam triple-pass amplifier is estimated to be about 108, the prepulse energy from the oscillator–preamplifier feeding the final amplifier must be less than 10−12 J. Since about 0.2 J is required to drive each half of the dual beam module, a prepulse rejection ratio better than 4 × 1011 must be achieved.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128597324","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}
J. T. Jacobs, D. Schreiber, W. Crooks, W. J. Weiche
Laser transfer printing of high resolution microfilm has been achieved. Volatile dyes were transferred from a Mylar substrate into a plastic receiver substrate. The carrier and receiver were held in contact by a simple vacuum chuck. The 70-mW He-Ne laser beam was focused onto the carrier, where it was absorbed, heating the dye and causing it to vaporize. The vapor condensed on and diffused into the plastic receiver substrate.
{"title":"Microfilm by laser transfer printing","authors":"J. T. Jacobs, D. Schreiber, W. Crooks, W. J. Weiche","doi":"10.1364/cleos.1976.tud7","DOIUrl":"https://doi.org/10.1364/cleos.1976.tud7","url":null,"abstract":"Laser transfer printing of high resolution microfilm has been achieved. Volatile dyes were transferred from a Mylar substrate into a plastic receiver substrate. The carrier and receiver were held in contact by a simple vacuum chuck. The 70-mW He-Ne laser beam was focused onto the carrier, where it was absorbed, heating the dye and causing it to vaporize. The vapor condensed on and diffused into the plastic receiver substrate.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"58 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116107670","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}
Electrooptical (EO) devices, such as Pockels cells, can provide effective bidirectional isolation for high-gain laser systems, such as those used for laser fusion experiments. In these systems, undesirable forward propagating radiation in the form of a precursor to the main pulse can preheat or destroy the target. Retroreflected radiation, arising from target or component surfaces, can experience sufficient amplification to destroy optical elements near the front end of the system. Protection of the target and laser from these effects is an important consideration in the design of any high-power laser irradiation system.
{"title":"Designing large aperture Pockels cells","authors":"M. Summers, B. C. Johnson","doi":"10.1364/cleos.1976.tha8","DOIUrl":"https://doi.org/10.1364/cleos.1976.tha8","url":null,"abstract":"Electrooptical (EO) devices, such as Pockels cells, can provide effective bidirectional isolation for high-gain laser systems, such as those used for laser fusion experiments. In these systems, undesirable forward propagating radiation in the form of a precursor to the main pulse can preheat or destroy the target. Retroreflected radiation, arising from target or component surfaces, can experience sufficient amplification to destroy optical elements near the front end of the system. Protection of the target and laser from these effects is an important consideration in the design of any high-power laser irradiation system.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115236495","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 ARGUS laser system is presently performing irradiation experiments leading toward laser fusion at the Lawrence Livermore Laboratory. The laser is a two-arm system with 20-cm final amplifier apertures and is capable of delivering more than 3 TW of focusable power to laser fusion targets. This capability is planned to be upgraded in the near future. In this paper we describe the physical characteristics of the laser and associated facility and some important components incorporated therein, and we shall summarize system performance to date.
{"title":"Design, construction, and initial performance of ARGUS: a two-beam laser irradiation facility","authors":"W. Simmons, G. Allen, W. Neef, E. Wallerstein","doi":"10.1364/cleos.1976.tha3","DOIUrl":"https://doi.org/10.1364/cleos.1976.tha3","url":null,"abstract":"The ARGUS laser system is presently performing irradiation experiments leading toward laser fusion at the Lawrence Livermore Laboratory. The laser is a two-arm system with 20-cm final amplifier apertures and is capable of delivering more than 3 TW of focusable power to laser fusion targets. This capability is planned to be upgraded in the near future. In this paper we describe the physical characteristics of the laser and associated facility and some important components incorporated therein, and we shall summarize system performance to date.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114624318","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}
Pulsed laser instrumentation will be discussed, emphasizing advantages and limitations of engineering designs and techniques toward achieving optimum signal-to-noise with low cost, ease of operation, and reliability in a normal laboratory environment.
{"title":"Instrumentation for pulsed laser spectroscopy","authors":"G. Klauminzer","doi":"10.1364/cleos.1976.wf6","DOIUrl":"https://doi.org/10.1364/cleos.1976.wf6","url":null,"abstract":"Pulsed laser instrumentation will be discussed, emphasizing advantages and limitations of engineering designs and techniques toward achieving optimum signal-to-noise with low cost, ease of operation, and reliability in a normal laboratory environment.","PeriodicalId":301658,"journal":{"name":"Conference on Laser and Electrooptical Systems","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127566420","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：