NASA is utilizing solid state laser technology in remote sensing systems to monitor the health of Planet Earth. NASA’s objective is the systematic characterization of the total Earth system with special attention to possible anthropogenic changes. By studying the entire Earth over extended periods of time, it may be possible to detect threatening situations, such as the ozone hole or global warming and take reasoned measures to avoid them. A workshop, held under NASA's auspices, identified which earth variables are important to the health of the planet. Of these, about half can be monitored using laser remote sensors. Included in this subset are: aerosols, water vapor, wind velocity, ozone, and greenhouse gasses. Measuring these variables from a satellite has several advantages such as global, high resolution coverage and better high altitude sensitivity.
{"title":"Laser Remote Sensing at NASA Langley","authors":"N. Barnes","doi":"10.1364/sslma.1997.thc1","DOIUrl":"https://doi.org/10.1364/sslma.1997.thc1","url":null,"abstract":"NASA is utilizing solid state laser technology in remote sensing systems to monitor the health of Planet Earth. NASA’s objective is the systematic characterization of the total Earth system with special attention to possible anthropogenic changes. By studying the entire Earth over extended periods of time, it may be possible to detect threatening situations, such as the ozone hole or global warming and take reasoned measures to avoid them. A workshop, held under NASA's auspices, identified which earth variables are important to the health of the planet. Of these, about half can be monitored using laser remote sensors. Included in this subset are: aerosols, water vapor, wind velocity, ozone, and greenhouse gasses. Measuring these variables from a satellite has several advantages such as global, high resolution coverage and better high altitude sensitivity.","PeriodicalId":348889,"journal":{"name":"Solid State Lasers: Materials and Applications","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":"134037544","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}
Q-switching of the solid-state lasers is important because it provides short duration optical pulses required for laser ranging, nonlinear studies, medicine, and other important applications. The method chosen to switch the Q of the laser cavity greatly influences the size and complexity of the system. Passive Q-switch employing a solid-state saturable absorber is economical, simple and practical. Recently, tetravalent-chromium doped crystals such as Cr4+:YAG, Cr4+:GSGG, Cr4+:Mg2SiO4 and Cr4+:YSGG have been developed, some of them can replace conventional color-center crystals as the saturable absorbers for neodymium lasers.1-4 Unlike the F2- center in LiF crystal, Cr4+ in these crystalline hosts is formed in the specific growth process, therefore it has better long-term stability.
{"title":"Diode-Pumped Passively Q-switched Nd: YLF 1.053μm Laser by Using Cr4+:YAG as a Saturable Absorber","authors":"Dal-Young Kim, Wentao Hu","doi":"10.1364/sslma.1997.fb5","DOIUrl":"https://doi.org/10.1364/sslma.1997.fb5","url":null,"abstract":"Q-switching of the solid-state lasers is important because it provides short duration optical pulses required for laser ranging, nonlinear studies, medicine, and other important applications. The method chosen to switch the Q of the laser cavity greatly influences the size and complexity of the system. Passive Q-switch employing a solid-state saturable absorber is economical, simple and practical. Recently, tetravalent-chromium doped crystals such as Cr4+:YAG, Cr4+:GSGG, Cr4+:Mg2SiO4 and Cr4+:YSGG have been developed, some of them can replace conventional color-center crystals as the saturable absorbers for neodymium lasers.1-4 Unlike the F2- center in LiF crystal, Cr4+ in these crystalline hosts is formed in the specific growth process, therefore it has better long-term stability.","PeriodicalId":348889,"journal":{"name":"Solid State Lasers: Materials and Applications","volume":"5 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":"114350895","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. Ning, Shengshu Tang, Ying Xong, Zhiwu Chang, Jianquan Yao
Pump rate density and cavity photon density are spatial distribution functions. For multi-mode laser classified rate-equations are: When system is stable ∂ΔN(x,y,z)∂t=0, ∂Si∂t=0 (2) formula is stable equation satisfied for m transverse modes.
{"title":"Output Characteristics of Diode-Laser Side-Pumped Solid-State Laser","authors":"J. Ning, Shengshu Tang, Ying Xong, Zhiwu Chang, Jianquan Yao","doi":"10.1364/sslma.1997.fa2","DOIUrl":"https://doi.org/10.1364/sslma.1997.fa2","url":null,"abstract":"Pump rate density and cavity photon density are spatial distribution functions. For multi-mode laser classified rate-equations are: When system is stable \u0000∂ΔN(x,y,z)∂t=0, ∂Si∂t=0 (2) formula is stable equation satisfied for m transverse modes.","PeriodicalId":348889,"journal":{"name":"Solid State Lasers: Materials and Applications","volume":"6 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":"117096942","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 beam quality of high average power solid-state lasers can be significantly improved using phase conjugation based on stimulated Brillouin scattering (SBS) [1] in cells with a simple focusing geometry. The relatively high SBS threshold of several 10 kW in such cells, however, limits applications e.g. in continuously pumped laser systems. The SBS-materials used up to now are toxic liquids or gases under high pressure.
{"title":"Power scaling of solid state lasers over 100 W with fiber phase conjugators","authors":"H. Eichler, A. Haase, J. Kunde, B. Liu, O. Mehl","doi":"10.1364/sslma.1997.wa6","DOIUrl":"https://doi.org/10.1364/sslma.1997.wa6","url":null,"abstract":"The beam quality of high average power solid-state lasers can be significantly improved using phase conjugation based on stimulated Brillouin scattering (SBS) [1] in cells with a simple focusing geometry. The relatively high SBS threshold of several 10 kW in such cells, however, limits applications e.g. in continuously pumped laser systems. The SBS-materials used up to now are toxic liquids or gases under high pressure.","PeriodicalId":348889,"journal":{"name":"Solid State Lasers: Materials and Applications","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":"127475123","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}
Tunable laser action at 2.3 μm is of great interest for chemical detection and remote sensing. A laser at this wavelength based on the 3H4 - 3H5 Tm3+ transition has been demonstrated in several garnet1-2 and fluoride hosts3-4. In this paper we report on comparison of laser performance of 1.5 atomic % Tm:YLF and 1.5 atomic % Tm:YAG laser crystals. Output energies of over 1 mJ at 5 Hz have been achieved and slope efficiencies of 18% and 14% were measured relative to absorbed pump power for the YLF and YAG crystals respectively.
{"title":"Comparison of pulsed laser operation of 1.5% thulium doped YAG and YLF at 2.3 μm","authors":"V. Sudesh, J. Piper","doi":"10.1364/sslma.1997.thc4","DOIUrl":"https://doi.org/10.1364/sslma.1997.thc4","url":null,"abstract":"Tunable laser action at 2.3 μm is of great interest for chemical detection and remote sensing. A laser at this wavelength based on the 3H4 - 3H5 Tm3+ transition has been demonstrated in several garnet1-2 and fluoride hosts3-4. In this paper we report on comparison of laser performance of 1.5 atomic % Tm:YLF and 1.5 atomic % Tm:YAG laser crystals. Output energies of over 1 mJ at 5 Hz have been achieved and slope efficiencies of 18% and 14% were measured relative to absorbed pump power for the YLF and YAG crystals respectively.","PeriodicalId":348889,"journal":{"name":"Solid State Lasers: Materials and Applications","volume":"14 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":"126787794","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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