一种大能量受激布里渊散射相位共轭镜的研究

提出了一种可以满足大能量高峰值功率受激布里渊散射(SBS)相位共轭镜要求的独立双池结构，这种结构用在双程激光放大光路中可以补偿单程放大光路产生的动态和静态相位畸变.在7.1 J的入射能量下，最终得到了大于13 J的能量输出.相位共轭镜的能量反射率大于65%，相位共轭保真度达到90%，并且比较了以0°平面反射镜和以SBS相位共轭镜为腔镜的双程激光放大的输出结果，结果表明使用了SBS相位共轭镜之后，即使在大能量抽运的条件下也能得到很好的近场和远场保真度. 关键词： 受激布里渊散射 相位共轭镜 双程放大激光器 保真度     

非线性反馈法控制相位共轭波的光学时空混沌

相位共轭振荡器由一个标准镜和一个具有快速响应的无损耗Kerr介质作为相位共轭介质的相位共轭镜组成.利用非线性反馈方法，对相位共轭振荡器中的时间混沌和耦合相位共轭波映象系统中的时空混沌进行了控制，得到了稳定的控制结果.数值实验表明，该控制方法不需预先了解动力学系统，只需调整反馈系数，在实际系统中容易实现.控制结果为相位共轭波的混沌研究提供了理论依据. 关键词： 非线性反馈控制 相位共轭振荡器 混沌 时空混沌     

利用两种响应时间不同的光折变晶体实现仅对物体变化部分成像

用两种响应时间相差很大的光折变晶体Ce:SBN和Fe:LiNbO_3作为相位共轭麦克尔逊干涉仪的两个相位共轭镜,得到同一物体的两个有时间差的相位共轭像,再对这两个像做实时“异或”运算,就能实现仅对物体随时间变化部分的成像.这种方法可以大大增加两相位共轭镜的响应时间差,具有最小可探测速度低,输出信号强、输出保持时间长的优点.文中对此作了理论分析,并提供了该系统对真实物体成像的实验结果.     

带相位共轭镜的Nd:YAG激光系统

研究了相位共轭镜用于改善MOPA激光系统光束质量的特性研究.利用单纵模环形激光器作为振荡级,对加装有相位共轭镜的MOPA系统的相位共轭反射率、阈值进行了测试,并获得了重复频率10Hz、单脉冲能量大于200mJ、近衍射极限的高光束质量激光输出.     

带相位共轭镜的Nd∶YAG激光系统

研究了相位共轭镜用于改善MOPA激光系统光束质量的特性研究.利用单纵模环形激光器作为振荡级,对加装有相位共轭镜的MOPA系统的相位共轭反射率、阈值进行了测试,并获得了重复频率10 Hz、单脉冲能量大于200 mJ、近衍射极限的高光束质量激光输出.     

受激布里渊散射相位共轭镜在固体激光中的应用

综述了受激布里渊散射相位共轭镜在固体激光中的几种应用。受激布里渊散射相位共轭镜可用于减少光束发散角，改善光束的远场强度分布，实现几束光的相位锁定、压缩脉宽和波形控制。     

掺杂铌酸锂双相位共轭镜光学谐振腔的最佳抽运比

在强抽运条件下建立了光折变双相位共轭镜光学谐振腔的稳态强度公式,研究了输出功率同两个相位共轭镜的抽运功率之比的关系.调节该比值可使光腔两端各自的和总的输出功率分别达到最大.用Ce:LiNbO_(?),单晶和He-Ne激光构成了光折变双相位共轭镜光学谐振腔.实验值与理论值基本符合. 关键词：     

Nd:YAG激光在单晶硅中的四波混频相位共轭

以单晶硅作非线性介质,用调Q脉冲Nd:YAG激光作四渡混频,获得了相位共轭反射光波.从光激发电子-空穴对浓度及其所产生的相位光栅出发,理论计算了相位共轭镜的反射率.实验获得的共轭镜反射率为125%,并与实验中显示了其对相位干扰的补偿特性.     

异型BaTiO3自泵浦相位共轭镜实验研究

本文首次演示了一种高效异型BaTiO_3自泵浦相位共轭镜,用该相位共轭镜的45°角和135°角切面获得其共轭反射率分别大于60％和40％,文中还给出了其它实验结果和结论。     

熔石英棒-光纤构成的新型复合相位共轭镜的实验和理论研究

提出了一种新型的由熔石英棒和石英光纤组成的复合型相位共轭镜,其可运用于高重复频率激光输入系统中以改善光束质量.该复合相位共轭镜具有较高的受激布里渊散射反射率和受激布里渊散射损伤阈值以及较低的受激布里渊散射阈值等优点.实验中,在100 Hz重复频率下,最大获得了42.05%的受激布里渊散射反射率.根据实验条件,由耦合波方程及边界条件得到的物理模型,经数值求解后得到的结果和实验符合较好.且由理论结果提出了一种提高该复合型相位共轭镜工作状态的有效方法. 关键词： 复合型相位共轭镜 受激布里渊散射 熔石英 耦合波方程     

Numerical Simulation of Self-Pumped Phase Conjugate Plane--Curve Loop Mirror Based on Photorefractive Nonlinearity

We deal with computer simulation of a transient process in a self-pumped phase conjugate plane-curve loop mirror based on BaTiO3. In optimal circumstances the nonlinear reflectivity and fidelity of such a mirror respectively achieve 0.80-0.90 and 0.95-0.98. The generation of conjugate wave-front occurs due to scattering from the dynamic hologram which is produced in the region of self-intersection of forward and backward beams. In such a model the scenario of passing to unstable generation regimes is similar to the self-pumped phase conjugate plane-plane loop mirror and substantially differs from a single-crystal double phase conjugate mirror.     

Response of a BaTiO3 phase conjugate mirror to broadband and narrowband radiation

The bandwidth of a BaTiO₃ self-pumped phase conjugate mirror is measured in three different ways. 1) The crystal is exposed to infrared light with a phase change that is sinusoidal in time and the degree of phase modulation on the reflected wave is measured. As the modulation frequency is increased from 0.1 to 3 GHz, the modulation transfer function of the phase conjugate mirror decreases by a factor of 2. 2) The crystal is exposed to visible light from a laser operated both in a single longitudinal mode and in multiple longitudinal modes. When the laser bandwidth is increased from 20 MHz to 2 GHz the reflectivity of the phase conjugate mirror increases by up to a factor of 7. 3) A laser cavity is formed with the crystal as one end mirror and the lasing bandwidth is measured. Depending on the exact conditions, lasing bandwidths range from 2 to 240 GHz.     

Application of a phase conjugate Brillouin cavity for the generation of a train of short laser pulses

Summary An oscillator and a regenerative amplifier have been realized using a phase conjugate mirror in the amplifier laser cavity. The phase conjugate mirror, via stimulated Brillouin scattering, acts as a modulator owing to its time-depending reflectivity. A pulse-forming network applied to the amplifier increases the discharging time which contributes to get an output beam formed by a train having four short pulses. The shortest pulse was 2 ns FWHM long.     

外反馈He—Ne激光器的非稳特性研究

报道了平面镜和自泵浦相位共轭镜反馈Ｈｅ－Ｎｅ激光器的非稳特性，观测了反馈镜位置对激光光强起伏及波动频率的影响，即在半腔长的整数倍附近，激光光强具有较大的起伏和秒量级的准周期振荡，并对其产生机理进行了分析。     

BaTiO3自泵浦相位共轭镜

首次报道用国产光折变晶体BaTiO_6制成的反射率大于30%的自泵浦相位共轭镜(SPPCM).并使用它成功地完成了畸变像复原实验.文中给出了自泵浦相位共轭信号的建立与入射光强度.入射光和晶体晶轴夹角的依赖关系及其擦洗速率的实验结果.文中还首次提出了一种使用单块BaTiO_3晶体,使多束入射光同时获得各自相位共轭波的方法.     

Study of second harmonic generation by non-linear crystals with phase conjugation

We present the correction of the phase distortion which occurs during the second harmonic generation by non-linear crystals, such as KDP and KTP at high average power laser. This is due to the optical quality and thicknesses of the crystals which in turn influence the quality of the incident laser beam. This phase distortion is corrected by reflecting back the laser beam into the crystal using a phase conjugate mirror. It is found that the conversion efficiency of second harmonic generation without phase conjugation is more than that with phase conjugation. Far field pattern shows that the distortion of the laser beam can be corrected by using the phase conjugate mirror. Fidelity of the beam profile increases significantly with phase conjugation in the case of KDP crystal.     

掺杂铌酸锂He—Ne相位共轭激光器的稳态输出特性

实验研究了以Ce:Fe:LiNbO_3晶体为相位共轭镜的He-Ne外泵浦相位共轭激光器的稳态输出特性.并建立了在强泵浦条件下的理论公式.理论与实验曲线在趋势上相一致.     

Ce：Fe：LiNbO3晶体的全息存储和相位共轭特性的研究

本文用提拉法从熔体中生长了Ce:Fe:LiNbO_3晶体,并采用二波混合和简并四波混合方法研究和测试了晶体的全息衍射效率和相位共轭反射率.以Ce:Fe:LiNbO_3晶体作为存储元件和相位共轭镜,实现了光学实时全息关联存储.