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Optical properties of LaMgAl11O19:Cr,Nd* LaMgAl11O19的光学性质:Cr,Nd*
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35857
M. Shinn., W. Krupke, J. Caird, H. Newkirk
{"title":"Optical properties of LaMgAl11O19:Cr,Nd*","authors":"M. Shinn., W. Krupke, J. Caird, H. Newkirk","doi":"10.1063/1.35857","DOIUrl":"https://doi.org/10.1063/1.35857","url":null,"abstract":"The optical properties of Cr‐doped LaMgAl11O19 (LMAO:Cr) and LMAO:Cr,Nd have been measured. Evidence of Cr to Nd radiationless energy transfer was observed. Since LMAO:Nd may become a useful laser material, the prospect of further improving laser performance through Cr‐sensitization is discussed.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130438110","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}
引用次数: 0
High resolution laser induced fluorescence spectroscopy of highly excited vibrational levels in NaAr: A2∏r and B2∑+ NaAr: A2∏r和B2∑+中高激发振动能级的高分辨率激光诱导荧光光谱
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35726
A. Lyyra, W. P. Lapatovich, P. Moskowitz, M. Havey, R. Ahmad-Bitar, D. Pritchard
{"title":"High resolution laser induced fluorescence spectroscopy of highly excited vibrational levels in NaAr: A2∏r and B2∑+","authors":"A. Lyyra, W. P. Lapatovich, P. Moskowitz, M. Havey, R. Ahmad-Bitar, D. Pritchard","doi":"10.1063/1.35726","DOIUrl":"https://doi.org/10.1063/1.35726","url":null,"abstract":"This laser induced fluorescence study of NaAr reports the direct observation of vibrational and rotational structure of the B2∑+ state through spectroscopic means of Reference 1. Crossed laser and supersonic molecular beam technique is used. We study highly excited vibrational levels at both A2∏r and B2∑+ states. Several types of rotation induced perturbations are encountered and analyzed. Preliminary intensity calculations for the B‐X system lead us to believe that the adiabatic B2∑+ well minimum must be at smaller internuclear distance than has been estimated before. We estimate that 5.5 A < RBe < 6 A and that the B2∑+ state is at least 30 cm−1 deep. This is in agreement with the latest high resolution scattering data2.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126725175","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}
引用次数: 0
Image information transmission, storage, and acquisition using an acousto‐optic cell and optical matched filters 使用声光单元和光匹配滤波器的图像信息传输、存储和采集
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35828
D. Gregory, L. Huckabee, J. F. Hawk
{"title":"Image information transmission, storage, and acquisition using an acousto‐optic cell and optical matched filters","authors":"D. Gregory, L. Huckabee, J. F. Hawk","doi":"10.1063/1.35828","DOIUrl":"https://doi.org/10.1063/1.35828","url":null,"abstract":"An acousto‐optic beam deflector has been incorporated into a coherent VanderLugt optical correlator in an attempt to increase the volume of stored optical recognition information. The current research is limited to one dimensional deflection, however, the extension to two dimensional arrays of matched filters seems possible. The system discussed is real‐time; employing a Hughes liquid crystal light valve as an incoherent to coherent image converter. A modified liquid crystal television has also been used successfully for the same purpose.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126874378","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}
引用次数: 0
Multiphoton ionization spectroscopy of triplet states and radicals created in a supersonic beam 在超音速光束中产生的三重态和自由基的多光子电离光谱
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35728
P. M. Johnson, S. Sharpe
{"title":"Multiphoton ionization spectroscopy of triplet states and radicals created in a supersonic beam","authors":"P. M. Johnson, S. Sharpe","doi":"10.1063/1.35728","DOIUrl":"https://doi.org/10.1063/1.35728","url":null,"abstract":"Substantial quantities of triplet metastables and radicals are produced in a pulsed supersonic expansion by a pulsed electric discharge. Multiphoton ionization transititions of nitrogen molecule are seen originating from various metastable states throughout the visible and ultraviolet regions. Among these are the np←E3∑+g Rydberg transition. This constitutes the first identification of a triplet Rydberg series in nitrogen. Triplet states have also been studied in benzene. Radicals produced in the supersonic discharge include CC1, where the vibrational and rotational constants of the B state have been established by the resolution of higher vibrational levels for the first time.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126541570","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}
引用次数: 2
Anisotropies in laser‐induced chemical processes: Ejection of OH by the HONO Ã state 激光诱导化学过程中的各向异性:HONO Ã状态下OH的喷射
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35937
R. Vasudev
{"title":"Anisotropies in laser‐induced chemical processes: Ejection of OH by the HONO Ã state","authors":"R. Vasudev","doi":"10.1063/1.35937","DOIUrl":"https://doi.org/10.1063/1.35937","url":null,"abstract":"Aligned trans HONO is optically prepared in specific N=O stretching vibrational levels of the quasi‐stable A state. The ejected OH fragment is characterized by laser polarization and Doppler spectroscopy. The rotational and translational anisotropies, and the quantum state populations are probed through the A 2Σ+–X 2Π transition. The fragment is found to be rotationally aligned, and its unpaired π electron orbital lies preferentially in the plane of rotation. These effects become more pronounced at higher rotational energies. The OH translational velocity is anisotropic, resulting in characteristic Doppler‐split line shapes. These observations, together with the measured internal state populations, permit the construction of a detailed mechanism for the fragmentation process.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"18 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114016460","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}
引用次数: 0
Optically pumped molecular beam lasers 光抽运分子束激光器
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35880
B. Wellegehausen, U. Gaubatz, K. Bergmann
{"title":"Optically pumped molecular beam lasers","authors":"B. Wellegehausen, U. Gaubatz, K. Bergmann","doi":"10.1063/1.35880","DOIUrl":"https://doi.org/10.1063/1.35880","url":null,"abstract":"Investigations on Na2 and I2 dimer lasers using a supersonic molecular beam as laser active material have been performed. In the case of Na2 a threshold pump power of only 17 μW has been obtained.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"319 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122707489","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}
引用次数: 0
Enhancement of blue‐green efficiency by a spectrum convertor* 用光谱转换器提高蓝绿效率*
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35845
K. Han, C. Oh, J. Lee
{"title":"Enhancement of blue‐green efficiency by a spectrum convertor*","authors":"K. Han, C. Oh, J. Lee","doi":"10.1063/1.35845","DOIUrl":"https://doi.org/10.1063/1.35845","url":null,"abstract":"In order to enhance the efficiency of a blue‐green laser through spectrum conversion of the pumping light, a convertor dye, BBQ, was mixed in the laser dye solutions. The laser was pumped with a plasma radiation source. The maximum increase of laser output at the dye mixture of LD490+BBQ or coumarin 503+BBQ was about 80%. The enhancement is mainly due to the abundance of near uv in the pumping source, the fairly good match of the fluorescence band of convertor dye with the absorption band of the laser dye, and a small overlap of fluorescence band of laser dyes with triplet‐triplet absorption band of convertor dye.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127600308","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}
引用次数: 0
A quantum description of the free‐electron laser with a uniform magnetic field and a corrugated slow‐wave structure 具有均匀磁场和波纹慢波结构的自由电子激光器的量子描述
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35870
J. Soln
{"title":"A quantum description of the free‐electron laser with a uniform magnetic field and a corrugated slow‐wave structure","authors":"J. Soln","doi":"10.1063/1.35870","DOIUrl":"https://doi.org/10.1063/1.35870","url":null,"abstract":"A method is proposed to describe quantum mechanically the free‐electron laser with two explicit slow‐wave structures: one due to the uniform magnetic field and the other due to the metal grating. The aim of this description is to characterize the free‐electron laser capable of generating radiation in the far‐infrared/microwave spectral region.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131994854","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}
引用次数: 0
Conditions for γ‐ray lasing into multi‐beam Borrmann modes of Mössbauer crystals γ射线激光进入Mössbauer晶体多束Borrmann模式的条件
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35718
J. Hutton, G. T. Trammell, J. P. Hannon
{"title":"Conditions for γ‐ray lasing into multi‐beam Borrmann modes of Mössbauer crystals","authors":"J. Hutton, G. T. Trammell, J. P. Hannon","doi":"10.1063/1.35718","DOIUrl":"https://doi.org/10.1063/1.35718","url":null,"abstract":"The advantages of utilizing the 2‐beam Borrmann modes of a crystalline, rather than an amorphous, sample for the lasing modes of a γ‐ray laser (reduced lasing threshold and higher gains above threshold, due to reduced photoabsorption and improved coupling between the lasing mode and the nuclei) are well known.1,2 We discuss here the further improvements which are obtained in multi‐beam (3 or more) Borrmann modes. These modes would be fed automatically by emitters of multipole M1 or higher located within the crystal. As an example, the 6 beam mode which couples well the M1 emitters would have a lower threshold than a similar 2 beam mode. More importantly, the slope of the net gain vs. population inversion density curve would be three times greater in the 6 beam mode, allowing practical levels of gain to be reached at much lower inversion densities.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134159163","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}
引用次数: 0
Plasma diagnostics using coherent anti‐stokes Raman spectroscoy 相干抗斯托克斯拉曼光谱用于等离子体诊断
Advances in Laser Science-I Pub Date : 2008-06-05 DOI: 10.1063/1.35771
W. F. Lynn, P. Yaney, L. Goss, S. Kizirnis
{"title":"Plasma diagnostics using coherent anti‐stokes Raman spectroscoy","authors":"W. F. Lynn, P. Yaney, L. Goss, S. Kizirnis","doi":"10.1063/1.35771","DOIUrl":"https://doi.org/10.1063/1.35771","url":null,"abstract":"Non‐Boltzmann population distributions between the rotational and vibrational levels of N2 in a transverse hollow‐cathode discharge were observed using CARS and a scanned probe laser. A planar, crossed beam geometry was used which allowed high spatial resolution. The apparent rotational and vibrational temperatures were determined to be near 900 K and 1500 K, respectively, with a clear dependence upon position. The estimated uncertainty is ±75 K. Deviations from previously reported tempertures in positive‐column discharges is attributed to differences in electron energy distribution.","PeriodicalId":298672,"journal":{"name":"Advances in Laser Science-I","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134275414","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}
引用次数: 0
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