同步抽运锁模的掺镱光纤激光器

同步抽运锁模是一种调制增益的锁模技术，就是调节抽运光的调制频率使之等于激光器纵模间隔的整数倍。通过对抽运光源半导体激光器的驱动电流进行正弦调制，实现了掺镱光纤激光器(YDFL)的同步抽运锁模。通过调整抽运激光器的调制频率，在相应于二次谐波锁模，4阶有理数谐波锁模条件下分别得到了较窄的脉冲输出。对重复频率625kHz的二次谐波锁模脉冲序列，脉冲宽度小于20ns，约为抽运光宽度的1／40；平均输出功率2．34mw，能量转换效率约为5％。     

高波长调谐灵敏度的光子晶体激光器

加州理工学院的研究人员演示了第一台室温下电抽运、大模面积、边发射的光子晶体激光器。这台激光器的波长调谐灵敏度远高于其它光子晶体激光器，可以用作高质量抽运激光器或自由空间通信光源。     

基于粒子群算法的拉曼光纤放大器的多抽运源优化

基于粒子群算法(PSO)提出了一种优化多波长抽运拉曼光纤放大器的新方法。只要给定信号光的波长分布、功率、抽运光的个数、抽运光的波长和功率变化范围．再根据其他已知的光纤参数．就能优化出满足指定平均开关增益大小、指定增益平坦度所需的抽运源参数．包括各个抽运源的波长和功率。采用该方法对一个C波段的拉曼光纤放大器进行了优化．仅应用两个抽运光源就实现了平均开关增益分别为32dB、20dB、l7dh相应最大增益波动分别为的拉曼光纤放大器的设计．得到了各抽运光源的优化波长和优化功率。     

侧向抽运的双包层光子晶体光纤激光器

抽运光纤激光器最常用的技术是通过光纤的端面将抽运光聚焦到内包层中。这种方法的缺点是不能经受具有多个光源的高功率抽运。     

LD抽运的Cr4+:YAG被动调Q Nd:YAG激光器

研究了不同谐振腔下不同透射率的Cr4+:YAG调Q的激光输出特性.采用透射率为82%的Cr4+:YAG,在抽运功率1.1 W时,激光重复频率小于3 kHz,单脉冲能量达20 μJ,可以作为微脉冲激光雷达的发射光源.分析和比较了实验结果和理论计算,两者吻合较好.     

LD抽运的Cr4+∶YAG被动调Q Nd∶YAG激光器

研究了不同谐振腔下不同透射率的Cr4 + ∶YAG调Q的激光输出特性。采用透射率为 82 %的Cr4 + ∶YAG ,在抽运功率 1 1W时 ,激光重复频率小于 3kHz,单脉冲能量达 2 0 μJ ,可以作为微脉冲激光雷达的发射光源。分析和比较了实验结果和理论计算 ,两者吻合较好     

连续波LD抽运色心激光器

长期以来，色心激光器作为可调谐光源一直是染料激光器的替代品，但是近年来随着可调谐固体激光器的发展，其空间逐渐缩小。最近，俄罗斯科学院和美国IPG光子公司的研究者宣布他们获得了第一台连续波LD抽运色心激光器。     

反向多波长抽运RFA的稳定高效的打靶算法

基于求解非线性方程组的牛顿一拉斐森方法,提出了一种反向多波长抽运拉曼光纤放大器(BMP-RFA)数学模型的打靶算法。通过对实际应用条件下多种参数BMP-RFA数学模型的求解,表明该算法是高效和稳定的。采用该算法对波长分别为1420nm、1440nm、1460nm、1480nm和1500nm,功率均为220mw的5个抽运光源,波长为1530．33nm～1611．79nm、信道间隔为100GHz的ITU建议的C L波段100路信号光,20km标准单模光纤作为增益介质的BMP-RFA进行数值仿真,结果仅迭代4次就使5个抽运光源中最大的功率偏差降为0．3mW。     

被动调QDPL激光器预抽运技术的参数研究

如何改善被动调QDPL激光器的输出不稳定性一直是研究的重点。通过对预抽运技术的理论研究,对预抽运技术进行了数值分析,得出了相应的图表。研究表明,抽运光的脉冲部分及其占空比对于输出脉冲波动的影响存在最佳值;抽运光的直流部分和抽运频率对于输出效果影响较大。将预抽运和连续抽运加以比较,发现预抽运技术可用于在被动调Q中稳定输出脉冲。     

二极管角部抽运Nd:YAG基模激光器

为了分析角部抽运方式在中小功率激光器设计中的可行性,基于光线追迹法,计算了不同的激光介质几何结构参量和不同的二极管温度条件下角部抽运复合板条激光器的抽运效率和抽运均匀性。从模拟计算结果可知,只要选择合理的激光介质结构参量,角抽运方式能得到高的抽运效率和较好的抽运均匀性。设计了一种角部抽运Nd:YAG复合板条激光器,在45W的抽运功率下获得了12W的激光输出,光光转换效率约为26.7%,在40W抽运时光束质量Mx2=1.47,My2=1.36。理论分析和实验设计表明,角抽运方式在小功率激光器设计中是可行的。     

KTP光学参量振荡器输出激光的空间模式和光束质量

理论上通过二维傅里叶变换求解耦合波方程 ,分析了KTP光学参量振荡器 (OPO)信号光的空间分布 ;实验上利用Nd∶YAG倍频激光 ( 5 3 2nm)抽运非临界 (θ =90°,φ=0°) 及临界相位匹配KTP (θ =62 7°,φ=0°) OPO ,测量了参量光的空间分布、远场发散角及M2 因子等参数 ,讨论了抽运功率、谐振腔长、残余光后向二次抽运对OPO参量光的发散角和光束质量因子M2 的影响。     

Threshold lowering in GaN micropillar lasers by means of spatiallyselective optical pumping

A new optical pumping method is demonstrated for creating a population inversion in GaN micropillar cavities with circular symmetry. This approach employs an axicon lens to produce a ring-shaped optical beam and provides for independent control of ring thickness and diameter. By bringing the pump beam into coincidence with whispering gallery modes confined near the outer rim of the cavity, we achieve a significant reduction in the threshold pump intensity for room-temperature operation of GaN micropillar lasers     

苯的二级相干反斯托克斯喇曼散射(CARS)

设计了一套光路布置使用受激喇曼散射为相干光源,泵浦光子同受激光子之间混频,观测到苯的相干反斯托克斯喇曼散射共振现象,并获得很强的第二级相干反斯托克斯喇曼线.     

半导体激光器

Surface-emitting semiconductor lasers can make use of external cavities and optical pumping techniques to achieve a combination of high continuous-wave output power and near-diffraction-limited beam quality that is not matched by any other type of semiconductor source. The ready access to the laser mode that the external cavity provides has been exploited for applications such as intra-cavity frequency doubling and passive mode-locking.     

Mean field theory of optical bistability in a phase-conjugate resonator using nearly degenerate four-wave mixing

A mean field theory of nearly-degenerate four-wave mixing is developed for the optical bistability, which has recently been found in a phase-conjugate resonator consisting of a normal mirror and a phase-conjugate mirror under relatively strong pumping. The bistability in transmission of the probe beam occurs as the mirror separation or the probe offset frequency is changed, but for a limited range of probe beam intensity. This behavior is explained as occurring under injection-locked conditions because of combined effects of tilting and broadening, or narrowing of the resonance curves due to nonlinearities in the phase-conjugate reflectivity arising from pump depletion.     

圆柱面镜用于端面抽运光束整形误差分析

为了简化二极管端面抽运固体激光器的快轴准直,建立了圆柱面镜和聚焦镜作为二极管快轴准直系统的模型,给出了系统设计方法和关键参数的控制方法,通过仿真论证了以圆柱面镜做二极管激光器快轴校准的可行性,抽运光腰斑的大小和位置可以通过选择柱面镜半径、光源到柱面镜的距离、柱面镜到聚焦镜的距离及聚焦镜焦距来控制.结果表明,当柱面镜半径3mm、光源到柱面镜的距离0.7mm、柱面镜到聚焦镜的距离及聚焦镜焦距5mm时,抽运YAG晶体可以得到大于47%的光-光效率.     

Enhancement of Pumping Efficiency in a Vertical-External-Cavity Surface-Emitting Laser

We report an improved optical pumping efficiency in a vertical-external-cavity surface-emitting laser (VECSEL) by employing the double-band mirror (DBM), which acts as a pump beam reflector as well as a cavity mirror. The optical pumping efficiency of a VECSEL with the DBM was increased by 23%, as compared to one with the conventional distributed Bragg reflector. It was found that the use of the DBM was more effective in the VECSEL with the shorter absorption layer thickness.     

Resonating properties of passive spherical optical microcavities

As an optically pumped device, the lasing characteristics of a spherical microcavity laser depend on the optical pumping processes. These characteristics can be described in term of the Q factor and the optical field distribution in a microsphere. We derived analytical expressions and carried out numerical calculation for Q factor and optical field. The Q factor is found to be oscillatory functions of the radius of a microsphere and the pumping wavelength, and the pumping efficiency for a resonating microsphere is much higher than that for an anti-resonating microsphere. Using tunable lasers as pumping sources is suggested in order to achieve a higher pumping efficiency. Numerical calculation on optical field distribution in spherical microcavities shows that a well focused Gaussian beam is a suitable incident wave for cavity quantum electrodynamics experiments in which strong confinement of optical field in the center of a microsphere is requested, but higher order spherical wave should be used instead for exciting whispering-gallery-mode (WGM) microsphere lasers, for the purpose of favoring optical energy transferring to WGM in optical microspheres.     

斜入射激光抽运铯束频标中的光频移

本文对斜入射激光抽运斜入射激光检测小型铯原子钟实验系统上光抽运区荧光引起的光频移（主要是交流斯塔克移动）作了理论计算。结果表明斜光抽运方案可以有效降低铯原子束频标中的光频移。文中同时提出一种通过改变斜入射抽运激光发散角来直接测量光频移的新方法。     

500 kHz波长锁定878.6 nm LD双端泵浦Nd:YVO4声光调Q激光器

报道了一种由波长锁定878.6 nm LD双端抽运Nd:YVO4声光调Q激光器,重复频率在500 kHz时具有稳定的1 064 nm脉冲激光输出。在重频为100 kHz,晶体吸收功率58 W时,获得18.2 W的1 064 nm激光输出,光-光转换效率为31.3%,脉宽为15.2 ns;在重频为500 kHz、晶体吸收功率58 W时,获得26.1 W的1 064 nm激光输出,光-光转换效率为45%,脉宽为44.2 ns,重频在100~500 kHz下具有稳定的脉冲输出,光束质量较传统模式下有明显提高,并且转换效率也有提升。实验表明:利用波长锁定878.6 nm激光二极管直接泵浦的方式,有利于降低晶体热效应、提高光束质量,提高光-光转换效率,获得窄脉宽的脉冲激光输出,并且在一定的温度变化范围内具有极好的温度稳定性。