LD端面泵浦千赫兹多波长激光器

报道了一台用于大气探测激光雷达系统的LD脉冲端面泵浦Nd∶YAG激光晶体的腔外倍频千赫兹多波长激光器.采用紧凑介稳腔设计和电光调Q方式,获得具有高动静比的1064 nm基频光脉冲输出.腔外采用Ⅰ类相位匹配LBO晶体倍频,Ⅱ类相位匹配LBO晶体和频,实现了355 nm和频光输出,同时对355 nm和频光单脉冲能量的影响因素进行了理论分析和实验研究.当倍频转换效率为53％时,获得重复频率为1 kHz的三波长激光分束输出,对应的单脉冲能量分别为1.18 mJ@1064 nm、1.06 mJ@532 nm、0.73 mJ@355 nm;脉冲宽度分别为3.49 ns@1064 nm、3.42 ns@532 nm、3.02 ns@355 nm;光束质量因子分别为Mx2=1.70、Mx2=1.75@1064 nm,Mx2=1.57、Mx2=1.41@532 nm,Mx2=1.51、Mx2=1.38@355 nm.     

光栅型可调谐掺铥连续光纤激光器研究进展

2 μm波长可调谐掺铥连续光纤激光器具有调谐范围宽、输出线宽窄和噪声低等特点,在激光雷达、遥感、光通信、光谱分析、环境监测及激光医疗等领域具有重要应用,近年来成为光纤激光技术领域的研究热点.文章首先介绍了可调谐光纤激光器中实现波长选择的各类光栅元件的基本结构及工作原理,涉及到的光栅元件主要包括闪耀光栅、体布拉格光栅和光纤光栅;其次重点阐述了基于光栅的可调谐掺铥连续光纤激光器在国内外的研究进展,最后对其未来的发展趋势做出展望.     

Fabrication of narrow pulse passively Q-switched self- stimulated Raman laser with c-cut Nd:GdVO4

Combining the self-stimulated Raman scattering technology and saturable absorber of Cr4+:YAG, a 1.17 μm c-cut Nd:GdVO4 picosecond Q-switched laser is demonstrated in this paper. With an incident pump power of 10 W, the Q-switched laser with average power of 430 mW for 1.17 μm, pulse width of 270 ps, repetition rate of 13 kHz and the first order Stokes conversion efficiency of 4.3% is obtained. The Q-switched pulse width can be the narrowest in our research. In addition, the yellow laser at 0.58 μm is also achieved by using the LiB3O5 frequency doubling crystal.     

Nd:YVO4自锁模皮秒激光器

设计并研究了Nd:YVO4自锁模皮秒激光器,探究了激光器的最佳锁模条件。观察并分析了自锁模皮秒激光器准周期锁模、倍周期锁模状态,研究并测量了结构紧凑的直腔自锁模激光器的输出特性。谐振腔为凹平直腔,Nd:YVO4晶体作为激光增益介质和克尔介质,在未加其他锁模元件的情况下,实现了1 064 nm高效率连续锁模脉冲激光输出。晶体距输入镜16 mm、腔长为90 mm时,对1 064 nm透过率分别为10%、20%、30%和50%的四种输出镜下激光器的输出特性进行了对比分析。对激光器进行优化设计,输出镜透过率为10%,泵浦功率为8 W时,激光器输出功率为2.76 W,斜效率高达43.2%,锁模脉冲重复频率为1.43 GHz,激光器实现了高效、稳定的连续锁模。     

Generation of picosecond vortex beam in a self-mode-locked Nd:YVO4 laser

In this paper, a self-mode-locked Nd:YVO4 picosecond vortex laser is demonstrated, which can operate on the different Laguerre-Gaussian (LG) modes at 1 064 nm. A π/2 mode converter is utilized to realize the picosecond vortex laser with LG mode transformed from the high-order Hermite-Gaussian (HG) mode. For the proposed laser, the mode-locked pulse repetition rate is 1.81 GHz. The average output powers of LG12 mode and LG02 mode are 1.241 W and 1.27 W, respectively, and their slope efficiencies are 23.2% and 24%, respectively. This work has been supported by the National Natural Science Foundation of China (No.61108021), and the Fundamental Research Funds for the Central Universities (Nos. 2013JBM091 and S16JB00010). E-mail:pengjiying@163.com      

C-cut Nd-doped vanadate crystal self-Raman laser with narrow Q-switched envelope and high mode-locked repetition rate

In this paper, a passively Q-switched and mode-locked c-cut Nd-doped vanadate crystal self-Raman laser at 1.17 μm is firstly demonstrated by using Cr^4＋：YAG. Two crystals of Nd^3＋：YVO4 and Nd^3＋：Gd VO4 are adopted to generate laser, respectively. With the incident pump power of 13 W, the average output powers of 678 m W and 852 m W at 1.17 μm are obtained with the durations of Q-switched envelope of 1.8 ns and 2 ns, respectively. The mode-locked repetition rates are as high as 2.3 Hz and 2.2 GHz, respectively. As far as we know, the Q-switched envelope is the narrowest and the mode-locked repetition rate is the highest at present in this field. In addition, yellow laser output is also achieved by using the Li B3O5 frequency doubling crystal.