共查询到20条相似文献,搜索用时 78 毫秒
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利用OMA4首次测量了连续波氧碘化学激光器腔内的碘荧光,观察到了I2(B,ν→V,ν")(碘分子的B态到X态跃迁)能级跃迁的谱线并给予了归属。 相似文献
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采用三次谐波稳频的方法,对Nd:YVO4/KTP环形倍频激光器的碘吸收谱线的超精细结构进行研究,在实验上观测到的两组谱线的超精细结构与理论值基本相符,其中,观测到的R(70)36-1谱线属于第一激发态跃迁,这一结果尚未见报道。 相似文献
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化学氧碘激光器光腔中碘分子浓度的测量 总被引:1,自引:1,他引:0
依据Beer定律,采用双光路法,利用Ar ̄+激光器的488nm线作为探测激光,对化学氧碘激光器光腔中的碘分子浓度进行了瞬时测量,详细地研究了化学氧碘激光器重要部件之一,激活介质的给体-腆池的工作性能对其他工作参数的依赖关系,并估计了kw级化学氧碘激光器的最佳氧碘配比约为90:1. 相似文献
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相互注入锁定是相干合成技术中最具发展前景的方案之一. 在两个光纤激光器相互注入锁定的基础上,利用可调节光纤光栅改变其中一个激光器的中心谱线和利用不同的分束器改变两个激光器间的耦合系数,同时监测两个激光器的远场光斑和谱线,判断激光器谱线和耦合系数对相互注入锁定的影响. 通过理论和实验得到:提高耦合系数可以提高锁定的频率差;两个激光器的谱线越接近锁定的效果越好,当激光器的谱线超过一定范围时,两个激光器将不能被锁定.
关键词:
光纤激光器
相干合成
相位锁定 相似文献
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碘激光的大气衰减特性 总被引:5,自引:0,他引:5
碘激光波长处在大气微窗口,水汽分子的吸收是碘激光在大气中传输时衰减的主要原因。利用HITRAN数据库,计算了碘激光波长模式的大气衰减情况。利用高分辨串光谱实验系统,获得了1.315μm附近的谱线参量。在我国,由南向北,由夏到冬,水汽浓度逐渐减少,水汽分子的吸收率递减。碘激光有6条超精细谱线,单一最强线频率的碘激光的大气分子吸收比多谱线的碘激光小,更有利于大气传输。在中纬度夏季,单一最强线垂直向上全程的大气分子吸收率与多谱线碘激光水平传输1km相当,为9.0%。碘激光垂直向上传输比海平面水平传输受大气影响小。 相似文献
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空心阴极He-Cd~ 激光器有12条振荡谱线。传统的空心阴极只能用脉冲振荡方式发射325nm振荡谱线,该谱线有希望用于测量和化学分析领域。还希望325nm谱线和可见光波段内的一条或多条谱线同时振荡。作者用阴极长为61cm的空心阴极He-Cd~ 激光器用于高功率白光激光振荡,可使325nm单谱线连续振荡,功率为18mW。 相似文献
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As one of the mechanisms for stable multiwavelength oscillation in a fiber Raman ring laser, an inhomogeneous loss induced by intraline four-wave mixing in a fiber Raman laser is physically explained and experimentally validated by comparison of laser peak gain and power gain as well as the gain spectra at several pump levels. 相似文献
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P. J. Bream J. J. Lim S. Bull A. V. Andrianov S. Sujecki E. C. Larkins 《Optical and Quantum Electronics》2006,38(12-14):1019-1027
We describe the inclusion of nonequilibrium gain into a self-consistent 2.5D CW spectral laser diode model and report on the use of this model to investigate the origin of gain compression in a 975 nm high-brightness tapered QW laser diode. Nonequilibrium gain is calculated using a dynamic gain model, which simulates the dynamic relaxation of the quantum well carrier energy distributions under the influence of steady-state electrical and optical excitation. Calculated gain and spontaneous emission spectra are included in the laser model via parameterised look up tables. Both simulated and experimentally measured intracavity spontaneous emission spectra show an increased carrier density and a blue-shift of the gain maximum with increasing bias caused by carrier heating and spectral hole burning. The accurate incorporation of nonequilibrium gain compression is therefore vital for the accurate prediction of the operating characteristics of these devices and for the experimental determination of the active region temperature. 相似文献
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Lifu Zhang Xiquan Fu Jianqin Deng Shuangchun Wen Dianyan Fan 《Optics Communications》2011,284(8):2210-2214
We experimentally investigate the evolution of spatial modulation of broadband laser pulses with different pulse durations through a medium with non-instantaneous Kerr nonlinearity. By modifying the input laser pulse width, we observe the nonlinear growth of the spatial stripes that arise from interference with different modulation frequencies, and then obtain the gain spectra of the spatial modulation which clearly reveal the influence of relaxation effect on spatiotemporal modulation instability. We find that all gain spectra have the similar fastest growing frequency, but they have tails at higher frequency region in which the growth rate of gain is bigger for shorter pulse duration. The experimental results are confirmed by the perturbational analysis. 相似文献
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根据参量放大和拉曼效应共同作用下的耦合波方程,在考虑高阶色散情况下,当输入泵浦波偏振方向同双折射轴成45时,通过引入拉曼增益的洛伦兹模型,研究了高双折射光纤中,参量放大和拉曼效应共同作用下的增益谱随相关参量的变化关系。结果表明:高双折射光纤中,在不同色散区,不同的输入参量(输入功率、群速度失配等)条件下,参量放大和拉曼效应共同作用下的增益谱受到高阶色散的影响,增益谱的结构、强度和谱宽产生了变化, 高阶色散对增益谱的影响不可忽略;可以利用增益谱在大群速度失配区域远离中心频率偏移的性质,提取T频率脉冲。 相似文献
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通过半导体激光器两端的放大自发荧光辐射可以获取器件的光学增益信息. 本文利用这一新的增益实验测量方法, 开展了对连续运行的808nm GaAs/AlGaAs量子阱激光器横向电场 (TE)与磁场(TM)偏振增益特性的实验研究. 通过将实验结果与理论增益曲线对比, 分析了非应变GaAs量子阱TE和TM极化偏振对应的空穴子能带随注入电流的变化规律, 以及激光器在连续运行状态下的实际增益状态和影响因素.
关键词:
半导体激光器
增益测量
偏振
量子阱和能带 相似文献
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A theoretical model is derived by which the occurrence of the single and multiple emission line spectra of tunable microcrystal lasers is described. These spectra in general exhibit several emission lines, arising from the Stark-split atomic levels of the lasing ions in the crystal field. The model is based on the shift of the resonator frequencies due to the thermally induced shift of the optical resonator length and demonstrates that the coincidence of the resonator frequencies with the laser gain lines leads to the emission of single or multiple line spectra of microcrystal lasers. These spectra can be described by the model. The model is given as a set of criteria. In this way not only can predictions of the single emission-line tuning range be made but also resonator lengths can be optimized in order to obtain a maximum tuning range. Furthermore, Q-switched operation can be achieved for specific parameters by periodically shifting the resonator frequencies. The linewidth of the gain used in this model depends on the laser threshold and is folded with the thermal shift of the atomic transitions. Therefore the centre wavelength of the gain is assumed to be constant. The advantage is that this experimentally relevant linewidth can be measured easily with microcrystal lasers themselves, whereas spectroscopic data do not take laser threshold behaviour into account. It is shown that the results of the model are in good agreement with experimental data measured for two different Nd: YAG crystals. Simply by inserting other material and laser parameters, the model can easily be applied to other laser crystals and other wavelengths. 相似文献
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运用随时间变化的氙灯辐射光谱模型,建立了组合式钕玻璃片状激光放大器动态增益特性的模拟程序,实现了从氙灯放电到引出激光的全过程动态模拟。研究了钕玻璃片的两个重要参数厚度和掺杂浓度对增益性能的影响。在相同的泵浦强度下,储能通量由片厚度与掺杂浓度的乘积N0D决定,在N0D相同时得到相同的小信号增益。当N0D比较小时,N0D增加1倍时储能通量增加1.25倍,相应的单片放大器增益提高5.5%,对于7片长的放大器链,总的小信号增益将提高45%;当N0D比较大时,储能通量趋于饱和。 相似文献