共查询到18条相似文献,搜索用时 46 毫秒
1.
2.
从理论和实验的角度分析了在腔损耗调制状态下,当调制速度与CO2激光转动能级间的驰豫速度相当时,激光器输出脉冲峰值功率与增益系数间存在的非线性特性:峰值功率随增益系数的增加,存在饱和现象。这种特性是CO2B类激光器的特点,实验和理论模拟结果一致。 相似文献
3.
氧碘化学激光器(COIL)的混合喷管内发生的是气体动力学、化学反应动力学以及光学等相互耦合的复杂过程,每个过程都对COIL性能有着至关重要的影响。利用3维CFD技术,通过求解层流Navier-Stokes方程与组分输运方程,结合10种组分和21个基元反应的化学反应模型,对简化后的化学氧碘激光RADICL模型在亚声速段横向射流情况下,不同的主副流流量配比对小信号增益系数的影响情况进行了比较与分析。结果证明:过高或过低的碘分子浓度均不利于产生合理的小信号增益系数;存在最佳流量配比使小信号增益系数得到显著提高且分布均匀。 相似文献
4.
5.
6.
描述了利用脉冲光解碘原子激光器作为探测激光器测量连续波氧碘化学激光器小信号增益的方法与装置,给出了增益的测量结果,对实验结果和误差作了简单讨论。 相似文献
7.
8.
9.
10.
利用一简单的模型,从理论上证明了在化学氧碘激光器小信号增益存在依赖于系统总氧压力的最佳值,同时讨论了高压下工作的化学氧碘激光器的可行性,最后给出了确定化学氧碘激光器的最佳增益区的方法。 相似文献
11.
We consider a double-pass ring cavity with nonlinear incoherent optical feedback and analyze its response when it is driven by a continuous laser beam. This particular cavity is equivalent, in the temporal domain, to a simple spatial-pattern-generating system made from a Kerr slice and a feedback mirror. After formulating the evolution equations, we investigate the behavior of small-amplitude solutions and obtain an expression for the round-trip gains. We then explore the important effect of dispersion in the nonlinear medium. Finally, we show that stable modes are possible by solving numerically the full nonlinear equations. 相似文献
12.
T.W. Carr 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,19(2):245-255
We consider the deterministic dynamics of a semiconductor laser with saturable absorber that is subject to delayed optical
feedback. Alone, both the saturable absorber and delayed feedback cause the CW output to become unstable to periodic output
via Hopf bifurcations. We examine the combined effects of these two destabilizing mechanisms to determine new conditions for
the Hopf bifurcations. We also describe the transient as the unstable CW output evolves to the oscillatory state. A main result
is that the presence of a saturable absorber can increase the sensitivity of the laser to delayed feedback.
Received 1st August 2001 and Received in final form 28 November 2001 相似文献
13.
Ka S. Wu Peter J. Veitch Jesper Munch David J. Ottaway 《Applied physics. B, Lasers and optics》2014,114(3):415-419
Self-pulsing of continuous-wave Tm:YAlO3 lasers limits their use for a variety of important applications. We demonstrate for the first time that the pulsing can be suppressed via feedback to the pump diode laser, a technique that is suitable for both external resonator and monolithic lasers. We also show that the optical transfer function of the laser is that of an unstable relaxation oscillator. 相似文献
14.
《中国物理 B》2021,30(5):50505-050505
The 795 nm distributed feedback lasers have great application in pumping the Rb D1 transition. In this paper, in order to realize specific 795 nm lasing, we designed tilted ridge distributed feedback lasers based on purely gain coupled effect induced by periodic current injection windows through changing the angle of the tilted ridge. The fabricated devices were cleaved into 2 mm-cavity-length, including 5 tilted angles. The peak output powers of all devices were above 30 m W.Single longitudinal mode lasing was realized in all tilted Fabry–Perot cavities using periodic current injection windows,with side mode suppression ratio over 30 d B. The total wavelength range covered 8.656 nm at 20℃. It was disclosed theoretically and experimentally that the output powers, threshold currents, and central wavelengths of the tilted ridge purely gain coupled DFB lasers were relevant to the tilted angles. The results will be instructive for future design of DFB laser arrays with different central wavelengths. 相似文献
15.
Lehnert J Hövel P Flunkert V Guzenko PY Fradkov AL Schöll E 《Chaos (Woodbury, N.Y.)》2011,21(4):043111
We demonstrate that time-delayed feedback control can be improved by adaptively tuning the feedback gain. This adaptive controller is applied to the stabilization of an unstable fixed point and an unstable periodic orbit embedded in a chaotic attractor. The adaptation algorithm is constructed using the speed-gradient method of control theory. Our computer simulations show that the adaptation algorithm can find an appropriate value of the feedback gain for single and multiple delays. Furthermore, we show that our method is robust to noise and different initial conditions. 相似文献
16.
17.
基于射频负离子源的中性束注入系统是高功率长脉冲(稳态)运行中性束注入系统的最佳选择。负离子源是中性束注入系统的核心部件,需要实现稳定的负离子束引出和加速。在负离子源的运行过程中引出负离子电流会发生变化,尤其在长脉冲、高能量运行条件下会更加明显,因此无法满足稳定运行的要求。为了实现引出束流的稳定引出,开展了束流反馈控制研究,研发了一套基于射频功率调节的束流反馈控制系统,并将束流反馈控制系统应用在射频负离子源测试平台,开展了束流反馈控制测试。测试结果表明束流反馈控制系统能够实现对束流的实时反馈调节以获得束流的稳定引出,验证了基于射频功率调节的束流反馈控制的可行性,为高功率射频负离子源的研制提供支持。 相似文献