非线性镜锁模激光器的锁模条件

通过对非线性镜锁模激光器的稳态分析，找到了它的锁模条件及锁模脉冲的强度极限，为该激光器输出高功率的短脉冲提供了理论依据。     

电光腔倒空激光二极管抽运Nd:YAG锁模激光器

设计了一个简单的直腔。将电光腔倒空与激光二极管端面抽运Nd：YAG半导体可饱和吸收镜锁模激光器结合，实现了锁模脉冲的产生、放大和输出。在连续抽运功率5W的条件下。获得了脉冲宽度为11ps的锁模单脉冲输出和脉冲宽度为200ns的调Q脉冲输出，腔倒空单脉冲能量为30nJ，重复频率为10Hz。连续锁模运转时单个锁模脉冲的能量约为2nJ。利用腔倒空将单脉冲的能量提高了15倍左右。文章详细讨论了腔倒空脉冲及调Q脉冲的产生机理，并分析了加在电光晶体上的高压电脉冲以及偏振片的偏振度对腔倒空脉冲及调Q脉冲的影响。     

环形腔自锁模渗钛蓝宝石激光器

实现了环形腔掺钛蓝宝石激光器的自锁模运转，在双向同时锁模时获得宽为３６ｆｓ的我没模脉冲，在单向锁模时得到脉宽为３２ｆｓ的锁模脉冲，并对激光器的运转特性进行了分析。     

环形腔自锁模掺钛蓝宝石激光器

实现了环形腔掺钛蓝宝石激光器的自锁模运转。在双向同时锁模时获得脉宽为３６ｆｓ的锁模脉冲；在单向锁模时得到脉宽为３２ｆｓ的锁模脉冲。并对激光器的运转特性进行了分析。     

自启动,长时间稳定,低功率泵浦的超短脉冲掺钛蓝宝石激光器

接钛蓝宝石晶体具有宽增益带（660～1100um）和大的增益截面（～3×10－19cm2），因此用掺钛蓝宝石激光器极易产生超短脉冲、高功率激光。主动锁模、被动锁模、对撞脉冲锁模、耦合腔锁模（APM）以及同步泵浦锁模的掺钛蓝宝石激光器，都已实现超短脉冲激光输出。更引人瞩目的是在掺钛蓝宝石激光器上采用自锁模技术，来获得超短脉冲激光。自锁模掺钛蓝宝石激光器的结构简单、运行稳定，已被广泛应用。目前国际上自锁模掺钛蓝宝石激光器产生的最短脉冲为8．5fs’‘’，对应的光谱宽度为151urn。掺钛蓝宝石激光器能自锁模产生超短脉冲的机理一…     

自锁模激光器

概述了自锁模激光器的新成就（包括我们自已的工作）。在实验上，自锁模钛宝石激光器可以输出１３ｆｓ的短激光脉冲，这是直接从激光器中获得的最短脉冲；自锁模溴化亚铜激光器可以输出高稳定性的激光脉冲，从而彻底否定了自锁模没有实用价值的传统认识。在理论上，自克尔镜模型解释了自聚焦激光介质引起的锁模现象；增益凹陷模型解释了宽带激光介质自吸收起的锁模现象和窄带激光介质增益谱线分裂引起的锁模现象。最后，对它们的输出     

电光腔倒空激光二极管抽运Nd∶YAG锁模激光器

设计了一个简单的直腔,将电光腔倒空与激光二极管端面抽运Nd∶YAG半导体可饱和吸收镜锁模激光器结合,实现了锁模脉冲的产生、放大和输出。在连续抽运功率5 W的条件下,获得了脉冲宽度为11 ps的锁模单脉冲输出和脉冲宽度为200 ns的调Q脉冲输出,腔倒空单脉冲能量为30 nJ,重复频率为10 Hz。连续锁模运转时单个锁模脉冲的能量约为2 nJ,利用腔倒空将单脉冲的能量提高了15 倍左右。文章详细讨论了腔倒空脉冲及调Q脉冲的产生机理,并分析了加在电光晶体上的高压电脉冲以及偏振片的偏振度对腔倒空脉冲及调Q脉冲的影响。     

全光纤主动锁模2 μm掺铥脉冲激光器

报道了全光纤结构主动锁模掺铥脉冲激光器,中心波长为1950 nm。利用电光相位调制器对光纤激光器进行腔内相位调制,获得了重复频率为11.884 MHz的主动锁模脉冲输出,脉宽为816 ps。改变泵浦功率、调制信号的频率和幅度,获得了重复频率为4~18 kHz的弛豫振荡调制稳定脉冲输出。锁模和弛豫振荡调制获得的输出脉冲能量波动低于7%。     

飞秒被动锁模环形腔掺Er3＋光纤激光器

在考虑增益、损耗、群速度色散、自相位调制、快速可饱和吸收体等各种参数同时作用情况下，分析了非线性偏振旋转效应自启动锁模机理，研究了腔体参数与锁模脉冲之间的关系，并给出飞秒被动锁模环形腔掺Er3＋光纤激光器实验原理。实验采用性能稳定的980nm半导体激光器作为抽运源，高掺杂短长度掺Er3＋光纤作为增益介质，利用非线性偏振旋转锁模技术，得到了稳定的飞秒自起振锁模光脉冲。抽运功率为23mW时，激光器输出锁模脉冲中心波长1552nm，3dB带宽为7.6nm，重复频率14.0MHz，平均输出功率0.43mW，自起振锁模泵浦阈值功率11.5mW,并观测到了稳定的高阶锁模脉冲输出。该激光器与报道过的相同结构光纤激光器相比,自起振泵浦阈值低、脉冲能量高、稳定性好，且频谱边带幅度小。     

半导体激光泵浦锁模调QNd：YAG板条激光器

报道准连续６０Ｗ半导体激光二极管侧面泵浦的锁模调ＱＮｄ：ＹＡＧ板条激光器，调Ｑ锁模的激光脉冲宽度（ＦＷＨＭ）为６０ｐｓ，调Ｑ脉冲包络宽度为２５０ｎｓ，积分能量１６３μＪ，最大锁模脉冲的峰值功率超过１００ｋＷ。     

双峰远场结构的激光二极管阵列光场传输特性

提出了一种描述激光二极管阵列(Laser Diode Array,LDA)双峰远场结构的光场新模型,该模型同时考虑了激光二极管阵列垂直于结平面大发散角的传输特性,基于亥姆霍兹方程的远场解,运用非傍轴光传输理论分析,得到描述激光二极管阵列远场光分布模型,其结果与实验测量结果吻合较好.     

Simulation of multilayer injection lasers with internal emission leaking

A mathematical model of multilayer injection lasers, based on the self-consistent kinetic problem taking into account the correlation between optical and electrical characteristics of a device is presented. The light-current characteristic of such laser is measured. A fast algorithm for computing complex eigenvalues of the wave equation is proposed. The calculation results are compared with experimentally measured light-current characteristics of diode lasers (fabricated by the GNOptics Company) with emission leaking to an optical cavity. The optical field profiles are determined in subthreshold and above-threshold modes for structures of high-power injection lasers with internal emission leaking. Good agreement between experimental and calculated data is achieved.     

Non-equiphase Hermite-Gaussian model of diode laser beams

A non-equiphase Hermite-Gaussian model is proposed to describe the field in the plane parallel to the junction of double-heterostructure (DH) diode laser beams. The analytical expression for the far field of DH diode laser beams is derived and used to compare the calculated intensity profiles with the measured and calculated values given by Nemoto and Zeng et al., showing a further improvement between the calculated and measured profiles by using the non-equiphase Hermite-Gaussian model.     

Reconstruction of source-field distribution of a diode bar laser beam by simulated annealing

A method for the simulation and optimization of the source-field distribution of a diode bar laser (DBL) beam by using the stimulated annealing and experimental data in the far field is proposed and illustrated by an example of a DBL JOLD-60-CPNN-1L, showing the applicability of the method. As compared with the previous models, this method is not restricted to the type of diode lasers (DLs), and the reconstructed results are accurate so long as the experimental data are sufficiently accurate.     

DFB激光二极管电流-温度调谐特性的解析模型

从DFB型激光二极管调谐机理出发,提出了电流-温度调谐特性的解析模型,通过实验测量结果辨识出模型参数,将模型应用于四个不同厂家的DFB型二极管激光器,得到激光器电流-温度调谐的解析模型;将模型预测值与实验测量值比较,相关系数均在0.9999以上.同时,利用CO₂气体的多个吸收谱线测量激光的波长,验证了解析模型的预测波长值,与HITRAN谱库中CO₂气体吸收波长的误差在3 pm内.解析模型能够精确预测激光器在快速调谐过程中的瞬态输出波长,其精度能够满足光谱分析、光 关键词： DFB激光二极管 调谐机理 解析模型 电流调谐和温度调谐     

Optical fibres for material processing lasers

Fibre transmission of high-power radiation has opened the laser a new dimension of material processing applications. The three-dimensional treatment revolutionised a far field of the production technology. One impressed example is the laser welding process in the automotive industry. The Nd–YAG solid state laser in combination with the optical fibre increase the automation and the flexibility of a whole industry. The next generation of Audis aluminium alloy car body is mainly welded by fibre-guided Nd–YAG laser beams. Since the past 10 years the maximum average laser power transmitted through optical fibres increase from some 100 W up to 10 kW. For industrial application only Nd–YAG lasers and recently the diode lasers are economically suited for fibre transmission.     

Frequency stabilization of blue extended cavity diode lasers by external cavity optical feedback

Optical feedback from a high-finesse V-resonator, developed for this study, results in efficient coupling with an extended cavity diode laser, stabilizing its emission frequency and strongly decreasing the laser linewidth. This in turn enhances resonator output power, thus increasing the signal-to-noise ratio when used for the detection of gas phase species by absorption spectroscopy. This effect was directly measured by heterodyning two extended cavity diode lasers at a wavelength of 409 nm with and without the influence of optical feedback from a high-finesse V-resonator. The heterodyne signal of freely running lasers is composed of a set of sharp peaks whose envelope shows a width on the order of 4.5 MHz at a sweep rate of 80 MHz/0.8 s, leading to a laser linewidth of 3 MHz. Optical feedback from the high-finesse V-resonator reduces the heterodyne signal to a single peak with a mean width of 10 kHz, leading to a laser linewidth of 7 kHz. This is the lowest value of linewidth, reported thus far, for diode lasers operating in this wavelength region.     

高功率二极管激光器封装的多层焊接技术

 对高功率二极管封装工艺中的焊接技术进行了研究，掌握了高真空下利用蒸发沉积制备铟（In）焊料的方法，在不加助焊剂的情况下进行了多层焊接实验，并对封装的连续、准连续激光器进行了性能检测。结果表明，利用In和In-Sn合金的多层焊接技术进行激光器封装的方法是切实可行的。     

Diode laser based light sources for biomedical applications

Diode lasers are by far the most efficient lasers currently available. With the ever‐continuing improvement in diode laser technology, this type of laser has become increasingly attractive for a wide range of biomedical applications. Compared to the characteristics of competing laser systems, diode lasers simultaneously offer tunability, high‐power emission and compact size at fairly low cost. Therefore, diode lasers are increasingly preferred in important applications, such as photocoagulation, optical coherence tomography, diffuse optical imaging, fluorescence lifetime imaging, and terahertz imaging. This review provides an overview of the latest development of diode laser technology and systems and their use within selected biomedical applications. 670 nm external cavity diode laser for Raman spectroscopy built on a 13 × 4 mm² microbench (Copyright FBH/Schurian.com ).