端面抽运固体激光器的腔模匹配分析

探讨了端面抽运固体激光器的腔模匹配问题，文中的分析可为端面抽运固体激光器的设计提供参考. 关键词： 腔模匹配 端面抽运 固体激光器     

端面抽运固体激光器热透镜效应的实验研究

提出一种易于实现、对激光器本身没有干扰、高空间精度、可实时测量介质热透镜的干涉测量方法. 并利用此方法全面研究了端面抽运Nd:YVO4激光器的热透镜效应，为认识激光介质的热效应和设计此类激光器提供了参考.  关键词： 热透镜 端面抽运 固体激光器     

高功率准连续激光二极管抽运的Nd：YVO4激光器

对高功率准连续激光二极管端面抽运的Nd:YVO4固体激光器进行了实验研究。研究了抽运功率、温度、重复率及输出镜的透过率对激光器输出功率的影响。当激光二极管重复率达到720Hz、抽动功率33.2W时,激光输出最大平均功率为11W。     

连续激光二极管端面抽运Nd:YAG激光器噪声研究

以连续激光二极管端面抽运NdYAG激光器为实验模型,研究了该激光器中输出激光强度噪声、频率噪声和场分布噪声的特性,并根据实验数据推算出NdYAG晶体的粒子上能级寿命随温度变化为1.83μsK,发射截面随温度变化为-0.146×10-19cm2K。     

双端泵浦固体激光器模匹配问题的实验研究

实验研究了高功率双端泵浦Nb:YVO₄固体激光器的谐振腔与泵浦光束的模匹配问题.实验发现了输出功率随激光在增益介质中模半径与泵浦光斑半径之比的变化规律.在低泵浦功率ω₀/ω_p<1的条件下,激光器输出功率随ω₀/ω_p的变化不敏感.但在高泵浦功率下,输出功率随ω₀/ω_p的减小而增加.ω₀/ω_p存在一个下限,无论泵浦功率的大小,当ω₀/ω_p低于此下限时基横模消失,高阶模出现.这对于高功率端面泵浦固体激光器腔型的设计具有一定的参考价值.     

端面抽运四镜折叠腔Nd∶YVO4激光器的研究

基于传输矩阵理论,针对端面抽运的z型折叠腔Nd∶YVO4固体激光器的谐振腔设计进行了数值模拟,详细分析了腔内各参量对谐振腔稳定性的影响.由模拟结果推断,z型腔激光器具有两个稳区,并且稳区的范围可通过谐振腔各分臂的臂长来调节.利用相同的光学元件在不同的稳区范围设计了两种热稳腔,指出了长短腔型各自的利弊.实验考察了输出功率随腔长改变的变化情况,在不同腔长下的不同稳区分别获得了稳定的1 342 nm激光输出,谐振腔稳区范围的变化规律与理论计算基本符合.     

激光二极管端面抽运Nd:YVO4晶体连续输出板条激光器研究

报道了利用激光二极管列阵端面抽运Nd:YVO4混合腔板条激光器连续波输出的实验结果,获得近衍射极限的60 W连续激光输出.实验证明两种晶体输出功率相当,低掺杂浓度的Nd:YVO4晶体更有利于得到近衍射极限的高功率输出,但同时对冷却水温度的变化也较敏感.     

激光二极管端面抽运的1342nmNd：YVO4激光器

报道了用高功率线列阵光纤耦合激光二极管端面抽运的１３４２ｎｍＤｄ：ＹＶＯ４激光器,在１３．３０Ｗ输入抽运功率下,１３４２ｎｍ激光输出功率达到３．２２Ｗ,斜效率为２５．５％。输出功率不稳定度小于１％。     

激光二极管端面抽运的1342 nmNd∶YVO4激光器

报道了用高功率线列阵光纤耦合激光二极管端面抽运的 1342nmNd∶YVO4 激光器 ,在 13.30W输入抽运功率下 ,1342nm激光输出功率达到 3.2 2W ,斜效率为 2 5.5%。输出功率不稳定度小于 1%。     

激光二极管抽运Nd：YVO4／LBO红光激光器研究

报道了激光二极管抽运的Nd：YVO4晶体、LBO晶体Ⅱ类非临界相位匹配腔内倍频大功率红光激光器。通过对激光晶体热效应的考虑,设计了热不灵魂腔,采用低掺杂浓度Nd：YVO4晶体,获得了671nm红光的最高输出为890mW。     

CW mode locked Nd:YVO4 laser pumped by 20-W laser diode bar

The efficient cw mode locking (cw-ML) regime was demonstrated in Nd:YVO₄ laser by means of saturable absorber mirror (SAM). The 0.3-at.% Nd³⁺ doped 10-mm-long YVO₄ crystal end pumped by 20-W diode module with a beam shaper was applied as a gain medium located in the close vicinity to the rear flat mirror of the first arm of Z-type resonator of 316 cm total length with two curved mirrors of 100-cm curvature radii. The SAM of 2%-saturable absorptance and saturation fluence of 50 μJ/cm² was mounted at the opposite end of a resonator. The developed “dynamically stable” cavity design mitigates detrimental role of thermal aberration in gain medium, enforcing clean perfect mode locking even for the highest pump densities. The cw-ML pulses with 47.5 MHz repetition rate and pulse durations in the range of 15–20 ps were observed for a wide range of pump powers and output coupler losses. In the best case, for 32% of output coupler transmission, up to 6.2 W of average power with near 35% slope efficiency was achieved. The thresholds for Q-switched ML, cw-ML regimes were 2.67 W and 6.13 W of pump power, respectively. For the maximum pump power of 20 W we obtained 133 nJ of pulse energy with 16-ps pulse duration, resulting in a peak power higher than 8 kW. The threshold energy density at SAM giving the QML regime was estimated to be about 30 μJ/cm², threshold of cw-ML regime was 220 μJ/cm².     

Non-stationary characteristics of instability in a single-mode Nd:YVO 4 laser with fiber feedback

Random chaotic burst generation was experimentally observed in a single-mode microchip Nd:YVO₄ laser with fiber feedback. As the feedback strength was increased, a transition from stable relaxation oscillation state to unstable random chaotic burst state appeared. Furthermore, the non-stationary characteristic of probability association was experimentally identified at the transition of the two states while similar characteristics were reported only by numerical simulations of simple dynamical systems. This implies the general feature of non-stationary property of the dynamic switching between two states at transition. The observed chaotic burst generation and non-stationary nature were reproduced numerically based on the Lang-Kobayashi model. Received 28 March 2001 and Received in final form 5 June 2001     

Measurement of Thermal Lens Focal Length and Its Effect on Laser Output Characteristics in LD End-pumped Nd:YVO4 Lasers

According to the resonator transform circle theory, the focal length of thermal lens of laser media in laser diode end-pumped solid-state lasers is analyzed and measured with a simple method. A 30W 808nm LD pumped YVO4 laser is developed and characterized.     

Propagation parameters of the beam extracted from a diode pumped Nd:YAG ceramic slab laser with a hybrid stable–unstable resonator

We analyze the propagation properties of the beam extracted from a diode pumped ceramic Nd:YAG slab laser adopting a hybrid stable–unstable resonator. Such a resonator produces a beam characterized by an Hermite–Gauss mixture-like distribution in one transverse direction and a hard-edge diffracted distribution on the other transverse direction. The beam propagation parameters M_x² and M_y² are measured for different values of the diodes driving current. We obtain a beam parameter product smaller than 3 mm mrad in both transverse directions and in the whole range of powers, up to an extraction of 220 W in a QCW regime.     

二极管激光泵浦固体激光器和稳频研究

用调制法布里－珀罗干涉仪方法稳定二极管激光泵浦的ＮｄＹＶＯ４单频激光器的频率。在锁定情形下，激光频从自由运行慢漂移１．４３ＭＨｚ／ｓ和抖动±２．５ＭＨｚ分别改善到７５．７５ｋＨｚ／ｓ和±１ＭＨｚ     

Measurement of Thermal Lens Focal Length and Its Effect on Laser Output Characteristics in LD End-pumped Nd∶YVO4 Lasers

According to the resonator transform circle theory, the focal length of thermal lens of laser media in laser diode end-pumped solid-state lasers is analyzed and measured with a simple method. A 30W 808nm LD pumped YVO4 laser is developed and characterized.     

激光二极管端面抽运Nd:YVO4板条激光器及其热效应

激光器中激光介质采用板条状几何结构可以极大地降低它的热效应,但仍然需要进一步分析其影响,进而优化激光器效率.利用有限元分析方法分析了部分端面抽运的混合腔板条激光器中激光介质的热效应,计算的热透镜焦距与实测结果基本相符.分析了热效应对模式匹配的影响,分析结果对于优化激光器效率、改进谐振腔设计具有一定的参考价值.并在分析的基础上进行了混合腔实验,抽运功率为110 W时,获得连续输出激光功率41.5 W,光光转换效率约38%,斜效率达58.8%,M2因子为非稳腔方向M2x＝1.59,稳定腔方向M2y＝1.55.     

单频运转的Nd：YVO4激光器

报道了激光二极管纵向泵浦单频运转的Ｎｄ：ＹＶＯ４激光器，用波长为８０９ｎｍ激光二极管的连续输出功率６６０ｍＷ泵浦，获得１０６４ｎｍ，功率为１５５ｍＷ连续单频输出，泵浦阈值２２６ｍＷ，斜率效率３３．８％，线宽小于１０ＭＨｚ．