组合抽运DPL声光调Q特性研究

端-侧面组合抽运方案是提高DPL调Q脉冲峰值功率和压缩脉冲宽度的有效技术途径。借助给出的一组端-侧面组合抽运DPL声光调Q实验结果，依据调Q速率方程，理论分析了组合抽运光的空间分布对调Q脉冲特性的影响，数值计算结果与实验结果一致。实验和理论研究发现：组合抽运时的脉冲宽度明显小于侧面抽运时的脉冲宽度，峰值功率明显高于侧面抽运时的峰值功率。实验和分析结果表明：在总抽运功率和抽运结构确定的情况下，端面抽运光功率在总抽运功率中的占有率越大，脉冲宽度越窄，脉冲峰值功率越高。通过调整端面抽运光功率占有率，改变组合抽运光的空间分布，可以实现对DPL调Q脉冲特性的控制。     

Three-Mirror Multiple-Pass Cavity of a Transversely RF-Excited Planar Waveguide CO<Subscript>2</Subscript> Laser

A theoretical model for determining the optical losses in the three-mirror, multiple-pass cavity of a transversely rf-excited planar waveguide CO₂ laser with an exit mirror of arbitrary radius of curvature has been developed.__________Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 2, pp. 198–201, March–April, 2005.     

光泵磁共振实验中测量地磁场水平分量的方法

基于光泵磁共振实验过程中光抽运信号和磁共振信号出现的条件，阐述了3种测量地磁场水平分量的方法．通过实验，验证了用这3种方法所得到的测量结果是一致的．这项工作对于理解光抽运信号和磁共振吸收信号有一定帮助．     

Photofragment space distribution in the photodissociation of NaI in the spectral range 315–370 nm: the role of molecular axis rotation

The first determination of translational anisotropy parameters β in the photodissociation of NaI molecules in the spectral range 315–370 nm is reported. The anisotropy parameters were determined by the analysis of Doppler resolved absorption profiles of Na(²S_1/2) atoms produced in the photodissociation of NaI by linearly polarized light. The profiles were recorded for two orientations of the photolysis light: parallel and perpendicular to the direction of the probe beam. The value of the parameter β was obtained from a simultaneous fit of the profiles. The role of the rotation of the parent molecules on the branching ratio between parallel and perpendicular transitions in NaI during dissociation is discussed.     

同步泵浦PML飞秒激光研究

采用CW锁模YAG倍频激光器同步泵浦PML飞秒染料激光器,产生了平均脉宽约55fs、功率为15mW的光脉冲。文章在理论和实验上还研究了同步泵浦飞秒激光脉冲产生技术。     

Dye Laser-pumped Cr: LiSrAIF_6 Laser

ＤｙｅＬａｓｅｒ－ｐｕｍｐｅｄＣｒ：ＬｉＳｒＡＩＦ_６Ｌａｓｅｒ￥ＷＵＸｉｎｇ（Ｄｅｐｔ．ｏｆＰｒｅｃｉｓｉｏｎＩｎｓｔｒｕｍｅｎｔＥｎｇｉｎｅｅｒｉｎｇ，Ｔｉａｎｊｉｎ３０００７２，Ｃｈｉｎａ）Ｔ．Ｏｋａｄａ，Ｋ．Ｋａｅｄａ（Ｄｅｐｔ．ｏｆＥｌｅｃ?..     

泵浦功率密度对复合类锂离子X射线激光特性的影响

本文通过分析不同泵浦功率密度下类钾硅离子X射线激光的实验结果以及有可能实现X射线激光的其它类锂离子的光谱特性,表明利用类锂离子复合方案,在现有驱动激光装置上实现“水窗”波段放大器有很大的可能性。     

High power, long pulse, CH3I far infra-red laser

A high power, far infra-red laser, pumped by a long pulse high energy CO₂ laser, has been developed to produce 8 μs pulses at 447 μm. The influence of the molecular weight of the far infra-red gas on the absorption of the pump energy is discussed. The results show that the heavy molecules are most convenient for long pulse far infra-red lasers.     

Na2高位振动态与Ar，N2碰撞中模温度的变化

利用受激发射泵浦激发Na2分子,使Na2 得到布居,研究了高振动激发态Na2*与Ar和N2的碰撞弛豫过程。由激光诱导荧光得到Na2 各振动能级的时间分辨布居分布,从而得到Boltzmann振动温度和转动温度随时间的变化。对于Na2*与Ar碰撞,在泵浦-探测延迟时间tD=8μs前,振动温度Tvib减小很慢;在8-12μs间,Tvib迅速下降并达到平衡。而转动温度Trot和平移温度Ttran在Tvib迅速下降时才开始缓慢增加。对于Na2*与N2碰撞,Tvib存在三个变化阶段,先是迅速下降,然后下降减缓,最后减小很慢并达到平衡。而在整个过程中,Trot和Ttran一直是很缓慢地增加。实验数据说明了弛豫过程是分阶段进行的,单一速率系数不能正确解释复杂的弛豫过程,并会丢失平衡过程中的关键特点。     

Tunable te-CO2 laser-pumped formaldehyde far-infrared lasers: Offsets, assignment, and superfluorescence

Sixty and three absorption transitions in D₂CO and H₂CO, respectively, have produced a number of far infrared laser lines when they are pumped by an etalon-tuned TE-CO₂ laser. Almost all the absorption transitions pumped previously by a free runing TE-CO₂ laser have been efficiently pumped by the etalon tuned CO₂ laser and found to have offset within ±500 MHz from the line-center of the relevant CO₂ pump lines. 22 (1) absorption and 63 (4) emission lines of D₂CO (H₂CO) are assigned. Some of these lines have generated superfluorescence. In paticular, the D₂CO 319-m line pumped by CO₂-9P(32) delivered an output energy of approximately one half that of the well-known D₂O 66-m. It is shown that a large electric dipole moment and an appreciable amount of fractional population in the lower level of the pump transition of this line are responsible to the superfluorescence.