Development of DPSSL and Its Applications

1 Introduction Since the world first laser successfully developed by Maiman [1] in 1960, the research activities in this field has never been stopped. With diode laser pumping, it is possible to built higher efficiency, and therefore simpler and more compact laser in an all solid- state device. With recent progress in the development of reliable higher power diode lasers, parallel improvements in diode - pumped solid - state lasers have been made. Diode laser- pumped solid- lasers also offer …     

调Q频率对半导体侧向抽运固体激光器热稳定性的影响

热稳定性是半导体激光泵浦固体激光器（DPSSL）的重要问题,对出光功率、光束质量以及总体稳定性等都有严重影响。研究了热稳定腔的热稳定性条件,采用临界腔的方法实验测量了不同调Q频率激光振荡的热稳定区。结果表明：随着激光调Q频率的提高,激光的热透镜焦距变长,热稳定区变宽。研究结果对热稳定性理论进行了补充,为非线性效应等脉冲激光应用的腔型设计提供了有益指导。     

LD泵浦Cr4+,Nd3+:YAG自调Q腔内倍频激光器研究

Cr4 ，Nd3 ：YAG晶体的激光特性得到了系统研究．在LD泵浦下，Cr4 ，Nd3 ：YAG晶体获得了1.064μm的自调Q激光输出．激光平均输出功率达到3．36W，脉宽65ns，重复频率87kHz，光-光效率为15．3％．加入KTP晶体后实现了自调Q腔内倍频，获得了532nm的绿色脉冲激光输出，平均功率达到1W，脉宽210ns，重复频率47kHz，光-光效率为6％．对自调Q激光及其腔内倍频发现的现象进行了讨论．     

激光侦察装备发展动向

本文系统地综述了激光技术在侦察装备中应用的发展过程和现状，重点介绍了激光技术的特点和今后主要的发展趋势。     

多点抽运单点输出双镜环行激光器

提出并实现了多点抽运、单点输出的双镜非平面环行激光器。该激光器谐振腔由2面反射镜组成,其中1面反射镜直接镀制在激光晶体表面上,所产生的激光在2面腔镜之间沿着非平面光路传播,在谐振腔内形成振荡;该激光器可方便地进行多点端面抽运,降低热效应并提高输出功率;其输出反射镜分成2个扇区,面积大的扇区对振荡激光是全反射的,面积小的扇区对振荡激光是部分透射的,从而实现振荡激光在输出镜上的单点输出,给出了2点抽运时激光单点输出的实验结果。讨论了谐振腔光路模式的特征参数,给出了部分光路模式模拟图。     

输出高重复频率脉冲列的全固态激光器

报道了利用声光振幅调制锁模的方法,在激光二极管端面抽运Nd∶YVO4激光器上获得320MHz高重复频率脉冲列的实验结果。实验采用平平腔结构,腔长452mm,耦合输出镜透过率为3.6%。所用声光介质为熔融石英晶体,以铌酸锂作换能器,在驱动功率4.5W时,对1064nm波长衍射效率为5%,相应的调制深度为0.31。在最佳锁模状态下,激光二极管抽运功率为3.5W,此时激光平均输出功率为15mW,示波器记录脉冲宽度680ps,实测光束质量因子M2小于1.5。并在实验基础上对激光器工作的稳定性进行了分析,结果表明在腔长变化不超过±100μm时,输出波形仍是稳定的。     

一种改善激光器输出光束质量的新型谐振腔

由于横向抽运的DPSSL输出光束在两个垂直方向上有不同的发散角 ,把一对平行放置的柱透镜置于谐振腔内 ,形成一种可以改善激光器输出光束质量的新型谐振腔。利用 ABCD传输矩阵理论及等效G参数法计算了稳腔范围。从实验上测得横向上光束质量为M2x =1 2 31,而对于简单的平凹腔M2x =2 6 72 ,大大改善了DPSSL在横向上的光束质量因子     

二极管泵浦Yb:YAG Thin Disk激光器获得16W连续激光输出

近年来，Yb:YAG激光研究已被视为发展高效、高功率二极管泵浦固体激光器的一个主要方向。本文简要分析了Yb:YAG作为增昌质优于Nd:YAG的性质，阐述了Thin Disk激光器的原理，并介绍了我们在国内首次获得16W连续激光（波长1030nm)输出的二极管泵浦Yb:YAG Thin Disk激光器装置及数据。     

Quantitative analysis of C,Si, Mn,Ni, Cr and Cu in low-alloy steel under ambient conditions via laser-induced breakdown spectroscopy

A diode-pumped solid-state laser(DPSSL) with a high energetic stability and long service life is applied to ablate the steel samples instead of traditional Nd:YAG laser pumped by a xenon lamp,and several factors, such as laser pulse energy, repetition rate and argon flow rate, that influence laser-induced breakdown spectroscopy(LIBS) analytical performance are investigated in detail.Under the optimal experiment conditions, the relative standard deviations for C, Si, Mn, Ni, Cr and Cu are 3.3%–8.9%, 0.9%–2.8%, 1.2%–4.1%, 1.7%–3.0%, 1.1%–3.4% and 2.5%–8.5%,respectively, with the corresponding relative errors of 1.1%–7.9%, 1.0%–6.3%, 0.4%–3.9%,1.5%–6.3%, 1.2%–4.0% and 1.2%–6.4%. Compared with the results of the traditional spark discharge optical emission spectrometry technique, the analytical performance of LIBS is just a little inferior due to the less stable laser-induced plasma and smaller amount of ablated sample by the laser. However, the precision, detection limits and accuracy of LIBS obtained in our present work were sufficient to meet the requirements for process analysis. These technical performances of higher stability of output energy and longer service life for DPSSL, in comparison to the Q-switch laser pumped by xeon lamp, qualify it well for the real time online analysis for different industrial applications.     

DPSSL无线温控系统的设计与实现

采用温度传感器、嵌入式处理器与无线数传技术,设计了无线温度多点监控系统,实现了在300米距离内对多个DPSSL工作温度的控制和监测。本文介绍了无线温控系统的总体设计方案,详细阐述了其硬件组成、功能和实现方法,给出了上位机和下位机的软件设计思路。