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公开(公告)号：US4243881A
公开(公告)日：1981-01-06
申请号：US84245
申请日：1979-10-12
摘要： An intense broadband continuum light pulse of uniform spectral intensity and short time duration is generated. This continuum pulse is then downconverted in frequency to a region of interest, preferably in the infrared region, by applying it as a pump pulse to a molecular or atomic vapor so as to induce stimulated Raman scattering. The resulting Raman Stokes pulse surprisingly tends to have the same spectral bandwidth, intensity uniformity and time duration as the pump continuum pulse.The downconverted continuum pulse (the Raman Stokes pulse) is then used to probe a sample. The sample converts the uniform spectral intensity distribution of the probe pulse into a nonuniform spectral intensity distribution which contains the absorption spectrum of the sample. This spectrum pulse has the same spectral bandwidth and time duration as the Raman Stokes pulse and is finally upconverted in frequency to a region where the spectrum pulse can be conveniently recorded. This is done with a four-wave Raman mixing process in an alkali metal vapor. The vapor is simultaneously pumped with the spectrum pulse and with a second pumping light pulse (or beam) having a frequency in the vicinity of a suitable resonance line of the vapor so as to induce SERS. In the alkali metal vapor, the resulting Raman Stokes pulse and spectrum pulse beat together with the second pumping light pulse to produce an upconverted pulse at a higher frequency band, which surprisingly also tends to have the same spectral bandwidth, intensity distribution (spectrum) and time duration as the spectrum pulse. The upconverted pulse is then recorded either photographically or photoelectrically with conventional spectrographic apparatus.
摘要翻译： 产生具有均匀光谱强度和短持续时间的强烈的宽带连续光脉冲。 然后将该连续脉冲通过将其作为泵浦脉冲施加到分子或原子蒸气以便引起受激拉曼散射，从而频率下降到感兴趣区域，优选在红外区域。 所产生的拉曼斯托克斯脉冲令人惊奇地倾向于具有与泵连续脉冲相同的光谱带宽，强度均匀性和持续时间。 然后将下变频的连续脉冲（拉曼斯托克斯脉冲）用于探测样品。 样本将探针脉冲的均匀光谱强度分布转换成包含样品的吸收光谱的不均匀光谱强度分布。 该光谱脉冲具有与拉曼斯托克斯脉冲相同的光谱带宽和持续时间，并且最终以频率上变频到可以方便记录频谱脉冲的区域。 这是通过碱金属蒸气中的四波拉曼混合过程完成的。 蒸气同时用光谱脉冲泵浦并且具有在蒸汽的合适共振线附近具有频率的第二泵浦光脉冲（或光束），以引起SERS。 在碱金属蒸气中，所得到的拉曼斯托克斯脉冲和频谱脉冲与第二泵浦光脉冲一起拍击，以产生在较高频带上的上变频脉冲，令人惊奇地也趋向于具有相同的光谱带宽，强度分布（光谱）和 持续时间作为频谱脉冲。 然后用传统的光谱仪记录上变频脉冲的照相或光电。
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2.发明授权Tunable 16-micron coherent source including parahydrogen Raman transition and method 失效可调谐的16微米相干源，包括旁氢化拉曼跃迁和方法
公开(公告)号：US4278902A
公开(公告)日：1981-07-14
申请号：US974588
申请日：1978-12-29
申请人： Michael M. Loy , Peter P. Sorokin
发明人： Michael M. Loy , Peter P. Sorokin
CPC分类号： G02F1/39 , G02F1/3534 , H01S3/305
摘要： A coherent tunable narrow band IR source in the vicinity of 16 .mu.m is achieved by four-wave parametric mixing in parahydrogen. A pair of colinear laser beams, one from a narrow band CO.sub.2 laser, and a second from a multiline laser with output of wave number significantly below 14,400 cm..sup.-1, is focused in a parahydrogen containing cell. The multi-line laser beam drives a Raman process in the cell. The narrow band CO.sub.2 input beam mixes with this driver beam and the Stokes wave resulting from the Raman process to produce a 16 .mu.m output beam. Tuning of the CO.sub.2 laser allows tuning of the 16 .mu.m radiation emitted by the parahydrogen cell.
摘要翻译： 16 m左右的相干可调窄带红外光源是通过在二氢氢过程中进行四波参数混合实现的。 来自窄带CO2激光器的一对共线激光束，以及波数显着低于14,400cm -1的多线激光器的第二激光束聚焦在含有含氢的电池中。 多行激光束驱动电池中的拉曼过程。 窄带CO2输入光束与该驱动光束混合，并且由拉曼光谱产生的斯托克斯波产生16μm输出光束。 二氧化碳激光器的调谐允许调节由旁二极细胞发射的16微米辐射。
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3.发明授权公开(公告)号：US07106776B1
公开(公告)日：2006-09-12
申请号：US10633355
申请日：2003-08-01
CPC分类号： H01S3/2366 , H01S3/0085 , H01S3/0971 , H01S3/1086 , H01S3/2207 , H01S3/227 , H01S3/2308
摘要： A novel practicable type of gaseous optical gain medium for efficiently generating intense, highly monochromatic, continuous-wave (CW) or pulsed, coherent light beams is disclosed. Gain results from nonlinear optical pumping of a gas of Λ-type “three-level” atoms, coherently phased (“dressed”) via application to the medium of two monochromatic laser beams tuned to the resonance frequencies ω0 and ω′0. Nonlinear optical pumping of the “dressed-atom” gas is accomplished through the combined action of two separate physical processes: (1) A low pressure gaseous discharge, occurring continuously within the vessel containing the gain medium, produces intense narrow-band fluorescence at ω0 and ω′0 through the process of electron impact excitation (EE). (2) Via a specific form of the nonlinear photonic process of stimulated hyper-Raman scattering (SHRS), photons comprised by the narrow-band fluorescence generated in (1) are efficiently converted to photons comprised by the propagating coherent light beams at ω0 and ω′0, thus effecting amplification of the latter.
摘要翻译： 公开了一种用于有效地产生强烈，高度单色，连续波（CW）或脉冲相干光束的气体光学增益介质的新颖实用的类型。 通过应用于调谐到谐振频率ω2的两个单色激光束的介质，将λ型“三电平”原子的气体的非线性光泵浦获得相位相位（“穿透”）的结果。 >和ω''0 。 “穿透原子”气体的非线性光泵浦通过两个独立的物理过程的组合作用来实现：（1）在含有增益介质的容器内连续发生的低压气体放电，在欧米茄产生强烈的窄带荧光 通过电子轰击激发（EE）的过程，0 和ω'0 < （2）通过激发的超拉曼散射（SHRS）的非线性光子过程的特定形式，由（1）中生成的窄带荧光包含的光子被有效地转换成由传播的相干光束构成的光子， SUB> 0和ω'0 <0>，从而进行后者的扩增。
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4.发明授权Apparatus for producing tunable intense coherent radiation in the vicinity 628 cm..sup.-1 失效用于在628厘米-1附近产生可调谐强相干辐射的装置
公开(公告)号：US4264877A
公开(公告)日：1981-04-28
申请号：US879528
申请日：1978-02-21
摘要： Apparatus for producing tunable intense coherent radiation at approximately 628 cm..sup.-1 with a line width less than 0.1 cm..sup.-1. The apparatus includes an optical cavity containing a vapor cell and pumping means including at least one optical pumping source for directing energy at the cavity. In one embodiment the cavity encloses a material capable of stimulated emission in response to said pumping. The material has at least three atomic energy levels with at least a first and second atomic energy level separated by a particular energy quantum approximately equal to 628 cm.sup.-1 ; a transition from said first to said second atomic energy level favored over all other possible transitions from said first atomic energy level; said third atomic energy level, from which atoms can be pumped to said first atomic energy level in response to said pumping means. While this is consistent with classical laser operation the apparatus disclosed herein can also be used for stimulated Raman scattering. Tunability is achieved by tuning the pumping sources in the case of stimulated Raman scattering, or with the aid of the Zeeman or Stark effects for classical laser operation. Typical materials are potassium or strontium vapors. Several pumping arrangements are also disclosed.
摘要翻译： 用于在线宽小于0.1cm -1的约628cm -1处产生可调谐强相干辐射的装置。 该装置包括含有蒸汽池的光学腔和泵送装置，该装置包括至少一个用于在空腔处引导能量的光泵浦源。 在一个实施例中，空腔包围能够响应于所述泵送而受激发射的材料。 该材料具有至少三个原子能级，其中至少第一和第二原子能级由大约等于628cm -1的特定能量量级分开; 从所述第一原子能级到所述第二原子能级的转换优于来自所述第一原子能级的所有其它可能的转变; 所述第三原子能级别，响应于所述泵送装置，原子可从该原子能级被泵送到所述第一原子能级。 虽然这与经典的激光操作一致，但是本文公开的装置也可以用于受激拉曼散射。 在受激拉曼散射的情况下，或借助于经典激光操作的塞曼或斯塔克效应，调谐泵浦源可实现可调性。 典型的材料是钾或锶蒸汽。 还公开了几种泵送装置。
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