Cr^4＋：YAG的可饱和吸收特性与被动Q开关性能研究

运用速率方程计算了Ｃｒ＾４＋：ＹＡＧ晶体的可饱和吸收特性参数，包括初始吸收系数，饱和吸收系数，饱和光强和损耗调制度，用Ｃｒ＾４＋：ＹＡＧ对脉冲和连续Ｎｄ：ＹＡＧ激光器进行了被动调Ｑ，在脉冲Ｎｄ：ＹＡＧ激光器上得到了８ｎｓ的调Ｑ激光脉冲，在连续Ｎｄ：ＹＡＧ激光器的调Ｑ中得到了间隔和幅度抖动小于５％的输出脉冲充列。     

Cr，Tm∶YAG晶体中的能量转移

通过对Ｃｒ∶ＹＡＧ、Ｔｍ∶ＹＡＧ和Ｃｒ，Ｔｍ∶ＹＡＧ晶体吸收光谱和发射光谱的比较，研究了Ｃｒ，Ｔｍ∶ＹＡＧ晶体中的能量转移过程．指出Ｃｒ３＋→Ｔｍ３＋能量转移过程中，无辐射能量转移占绝对优势．     

Nd：YAG激光器切割金刚石膜的特性研究

采用Ｎｄ：ＹＡＧ激光器对金刚石膜进行切割，研究了激光器在不同输出功率下切割金刚石膜的速率和切割深度与时间的关系，以及Ｎｄ：ＹＡＧ激光器切割的金刚石膜在成份和形状上的变化特点，给出了比较理想的切割工艺条件。     

Cr^4＋：YAG调Q特性的理论和实验研究

从理论和实验两个方面研究Ｃｒ＾４＋：ＹＡＧ的调Ｑ特性，测量了Ｃｒ＾４＋：ＹＡＧ调ＱＮｄ＾３＋：ＹＡＧ激光器在不同条件下脉冲能量和脉冲宽度，并与理论结果进行比较，结果显示脉冲能量的理论结果与实验结果能较发地符合，脉冲工的理论结果与实验结果变化趋势大致相一致，文中还对Ｃｒ＾４＋：ＹＡＧ调ＱＮｄ＾３＋：ＹＡＧ激光器的其它实验现象给出定性解释。     

LD泵浦Nd:YAG微片激光器

ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器结构简单紧凑，与半导体激光器相比，前者具有激光线宽窄、光束质量好、相干长度长等优点，因此在一些测量领域有着较好的应用前景。目前对ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器的实验工作主要是获得单频、单模连续输出和线性频率调制特性研究。本文综述了近几年来ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器的研究方向、成果及应用，主要介绍了各国对ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器的调频特性的研究状况     

二极管泵浦的高效连续波基横模Nd：YAG激光顺

报道了用激光二极管端面泵浦的高效连续波ＴＥＭ００模Ｎｄ：ＹＡＧ激光器，最大输出为０．６５Ｗ，斜效率５１％，光－光效率最高达４０．６％，并给出了耦合力学系统和二极管泵浦Ｎｄ：ＹＡＧ激光器的器件结构。     

Cr^4＋：YAG在对撞脉冲锁模的Nd：YAG激光器中实现被动锁模的研究

在理论上提出了Ｃｒ＾４＋：ＹＡＧ作为可饱和吸收体在Ｎｄ：ＹＡＧ激光器中实现被动锁模的可能性，运用速率方程组导出在强激光脉冲作用下Ｃｒ＾４＋：ＹＡＧ激发态吸收的恢复时间和饱和光强。实验上在带有抗共振环结构的接近于介稳腔的脉冲式Ｎｄ：ＹＡＧ激光器中用Ｃｒ＾４＋：ＹＡＧ作为可饱和吸收体实现被动锁模运转，得到能量１３．５ｍＪ、平均脉宽１８０ｐｓ的锁模脉冲序列。     

二极管泵浦的高效连续波基横模Nd：YAG激光器

报道了用激光二极管端面泵浦的高效连续波ＴＥＭ００模Ｎｄ：ＹＡＧ激光器，最大输出为０．６５Ｗ，斜效率５１％，光－光效率最高达４０．６％，并给出了耦合光学系统和二极管泵浦Ｎｄ：ＹＡＧ激光器的器件结构．     

连续Nd:YAG激光高重复率电光调Q研究

研究了连续Ｎｄ：ＹＡＧ激光器中由于热效应使ＹＡＧ棒产生的双折射引起传输的线偏振光退偏为椭圆偏振光的退偏现象所产生的输出不稳定和多模的原因。电光调Ｑ技术被应用于连续氪灯抽运的Ｎｄ：ＹＡＧ激光器件。为了获得稳定、单模的输出,在谐振腔内放置了一对λ／４波片。通过实验研究,实现了重复频率１～６ｋＨｚ的窄脉冲激光输出,这将为连续抽运的Ｎｄ：ＹＡＧ激光器提供一种新的电光调Ｑ技术。     

LD泵浦Nd：YAG激光器的强度噪声特性研究

本文在理论研究了ＬＤ泵浦Ｎｄ：ＹＡＧ激光器的强度噪声特性，用传递函数的形式给出各种噪声湿源对激光器强度噪声的影响，计算结果指出，Ｎｄ：ＹＡＧ激光器输出的激光并非相干态光场，在几兆频率上存在高于散粒噪声基准几十ｄＢ的驰豫振荡噪声，在小于驰豫振荡频率范围，激光器的强度噪声基本上处于泵浦泵噪声水平。     

Comparative study of pulsed laser diode end-pumped thulium-doped 2-µm Q-switched lasers

We report pulsed laser diode(LD)end-pumped acoustic Q-switched Tm:YAG laser,Tm:LuAG laser,and Tm:LuYAG laser and the physical properties and spectra of Tm:YAG,Tm:LuAG,and Tm:LuYAG are analyzed.The Tm:LuYAG laser is pumped by 785-nm and 788-nm pulses separately,and is compared with Tm:YAG laser.Different output energy values and output wavelengths of Tm:LuAYG lasers pumped by LDs with different wavelengths are obtained and compared with each other.When the repetition frequency is 100 Hz,the pulsed Tm:YAG laser has single pulse energy of 15.9 mJ,pulse width of 126.7 ns,and the center wavelength of 2013.36 nm,and the pulsed Tm:LuAG laser possesses single pulse energy of 11.8 mJ,pulse width of 252.4 ns,and the center wavelength of 2023.65 nm,and the pulsed Tm:LuYAG laser output energy values are 12.32 mJ and 12.25 mJ with the slope efficiencies of 12.5%and 11.85%,the center wavelengths of 2017.89 nm and 2027.11 nm,respectively,while the pump sources are 785-nm and 788-nm pulsed LDs,respectively.     

A comparative study on diode-pumped single-frequency Tm:YAG and Tm:GdVO<Subscript>4</Subscript> lasers

In this paper, we present experimental results concerning on the laser characteristics of Tm:YAG laser and Tm: GdVO₄ laser. At room temperature, the maximum output power of Tm:YAG laser and Tm:GdVO₄ laser is 210 and 145 mW, respectively. High efficiency can be achieved for both lasers at room temperature. Nevertheless, compared with Tm:GdVO₄ laser, Tm:YAG laser can operate on single frequency with high power easily. As much as 60 mW of 2013.9 nm single-longitudinal-mode (SLM) laser was achieved for Tm:YAG laser. For Tm:GdVO₄ laser 51 mW of 1919.7 nm SLM laser was achieved. The SLM Tm:YAG laser is better for using as a seed laser for coherent wind measurements and differential absorption LIDAR systems.     

基于89C52的Cr,Tm,Ho∶YAG激光治疗机控制系统的设计

介绍了Cr,Tm,Ho∶YAG激光治疗仪控制系统。通过89C52单片机实现了脉冲激光电源分频电路的控制,通过该芯片控制步进电机驱动器以及脉冲激光电源实现了四路Cr,Tm,Ho∶YAG激光的轮流输出,耦合了一根320μm的低OH-石英光纤,目前的输出功率在国内处于领先水平。     

Comparative study of LD-pumped Tm:YAG and Tim:LuAG lasers

Widely tunable performances of Tm:YAG and Tm:LuAG lasers near 2 μm are demonstrated. The emission spectra of Tm³⁺ in these two single crystals are reported and analyzed. The lifetimes of the ³ F ₄ state in thulium-doped YAG and LuAG are 10.1 and 9.2 ms, respectively. In addition, it is proven that the Tm:YAG crystal with two bonded undoped YAG ends is promising for high-efficient operation.     

Simulation of laser dynamics and active Q-switching in Tm,Ho : YAG and Tm : YAG lasers

 We developed a detailed rate equation model to study laser dynamics and active Q-switching in Tm,Ho: YAG and Tm:YAG lasers. The simulation results agreed well with published experimental data, as well as provided new insights for optimizing pulse generation. Received: 7 March 1996/Accepted: 28 May 1996     

Theoretical and Experimental Investigations of Diode-Pumped Tm:YAG Laser in Active Mirror Configuration

Based on the rate-equations of quasi-three-level lasers, we analyzed the threshold and the output power of longitudinally pumped Tm:YAG lasers in an active mirror configuration. In contrast to one-pass pumping, two-pass pumping in this configuration will result in a 24% decrease in threshold and 16% increase in slope efficiency. Using a 3-W diode-laser pumping in the active mirror configuration, we demonstrated a CW Tm:YAG laser and obtained 735 mW output power with a slope efficiency up to 49%. Using a Ti:sapphire laser to pump the same device, the threshold power was further reduced and the slope efficiency reached 59%.     

Ho:YAG laser intracavity pumped by a diode-pumped Tm:YLF laser

We report a compact Ho:YAG laser that is intracavity pumped by a diode-pumped Tm:YLF laser. Both lasers exhibit pulse mode behavior. Operating both crystals at room temperature (25 degrees C), we obtained 1.6 W of average output at 2.09 microm from the Ho:YAG laser for 15.4 W of diode power incident upon the Tm:YLF rod and a slope efficiency of 21%.     

Efficient room-temperature operation of Cr3+-sensitized,flashlamp-pumped, 2µm lasers

Utilizing the results of Cr³⁺ → Tm³⁺ transfer efficiency studies, we have demonstrated that yttrium aluminium garnet (YAG) is the preferred host for room-temperature, flashlamp-pumped solid-state lasers operating in the 2.0 µm spectral range. We report data on two different sensitizer-activator combinations in YAG and yttrium scandium gallium garnet (YSGG) laser materials: one is doped with Cr:Tm:Ho and operates on the Ho³⁺⁵I₇ →⁵I₈ transition at 2.097 µm; the other is doped only with Cr:Tm, which lases on the Tm³⁺³F₄ →³H₆ transition at 2.014 µm. We have achieved a slope efficiency of 5.1% with the Cr:Tm:Ho:YAG laser, which is the highest slope efficiency yet reported for a room-temperature, flashlamp-pumped, 2 µm solid-state laser. We have measured thresholds as low as 38 J and output energies >1.5 J for that system. We also report the first room-temperature operation of an efficient flashlamp-pumped Cr:Tm:YAG laser at 2.014 µm. Thresholds as low as 43 J, output energies exceeding 2 J, and slope efficiencies as high as 4.5% have been achieved. This is an order of magnitude higher than the efficiency previously reported for a 2.01 µm Cr:Tm:YAG laser operated at cryogenic temperatures. These two efficient 2 µm laser systems (Cr:Tm:Ho:YAG and Cr:Tm:YAG) are discussed in terms of their potential for Q-switched operation.     

Dual wavelength lasers

Dual wavelength lasers are discussed, covering fundamental aspects on the spectroscopy and laser dynamics of these systems. Results on Tm:Ho:Er:YAG dual wavelength laser action (Ho at 2.1 μm and Er at 2.9 μm) as well as Nd:YAG (1.06 and 1.3 μm) are presented as examples of such dual wavelength systems. Dual wavelength lasers are not common, but there are criteria that govern their behavior. Based on experimental studies demonstrating simultaneous dual wavelength lasing, some general conclusions regarding the successful operation of multi-wavelength lasers can be made.     

Cr,Tm:YAG晶体中的能量转移

通过对Cr:YAG、Tm:YAG和Cr,Tm:YAG晶体吸收光谱和发射光谱的比较,研究了Cr,Tm:YAG晶体中的能量转移过程.指出Cr3+→Tm3+能量转移过程中,无辐射能量转移占绝对优势.