高功率准连续波腔内和频全固态黄光激光器

报道了高功率准连续波腔内和频全固态黄光激光器的研究结果.为获得高功率的黄光输出，首先，激光器采用准连续方式运转，在保持抽运水平的条件下降低热效应，从而提高光束质量和光光转换效率；第二，采用热近非稳腔腔型设计，双棒串接补偿热致双折射技术，获得大基模体积高光束质量的基频光；第三，通过优化腔型，采用L型共折叠臂平-凹对称腔，使两束基频光达到空间重合且满足功率配比.通过这些方法，得到了输出功率7.6W，重复频率1.1kHz的准连续波黄光输出.据我们所知，这是目前腔内和频方案所获得的最高功率全固态黄光输出. 关键词： 黄光激光 腔内和频 Nd：YAG激光 全固态激光器     

一种测量二极管侧面抽运固体激光器热焦距的方法

提出了一种能够简单、准确测量二极管侧面抽运固体激光器热透镜焦距的方法，明确提出采用非对称平平腔测量时，激光晶体端面与腔镜的间距不需要为零，并从实验上证明了方法的可靠性. 应用该方法的测量结果可以优化复合折叠和频黄光激光器的结构，保证两束基频在腔内达到最佳的空间重合，提高腔内和频效率. 关键词： 全固态激光器 Nd∶YAG激光器 热焦距 腔内和频     

LD抽运的Nd:YAG陶瓷/KTP绿光激光器

报道了一种LD端面抽运Nd:YAG陶瓷、KTP腔内倍频的全固态连续波绿光激光器.当抽运功率为21.6 W时，1064 nm基频输出达到11.3 W，光—光转换效率为52.3%.采用Ⅱ类切割的KTP晶体作为腔内倍频介质，在直腔结构下获得了最大功率为1.86 W的532　nm绿光输出，光—光转换效率为7%.输出光斑具有高斯型强度分布，1 W输出时的M²因子约为1.7. 关键词： 全固态绿光激光器 Nd:YAG陶瓷 KTP倍频 直腔     

LD泵浦Cr∶YAG被动调Q 556nm黄光激光器

通过对谐振腔镜镀制合理的激光薄膜，成功实现了LD泵浦Nd∶YAG 1.111 μm激光谱线的运转.利用LBO腔内倍频Nd∶YAG/Cr∶YAG结构获得了高重复频率被动调Q556 nm全固态黄光激光器，在注入泵浦功率为1.6 W时，得到平均功率51 mW，脉冲宽度48 ns,重复频率8.9 kHz,峰值功率高达119 W的脉冲黄光输出.     

全固态腔内SHG/SFG多波长黄光激光器

报道了一种利用大功率激光二极管端面抽运Nd…YAG激光晶体产生基频光,并通过非线性晶体的腔内倍频(SHG)与和频(SFG),实现多个二次谐波同时连续输出的多波长黄光激光器。将Nd…YAG晶体的1112.1、1115.9、1122.7nm谱线作为基频光,利用LBO和BIBO进行非线性光学频率变换,同时获得了三个倍频光及三个和频光激光输出。从理论上对基频光同时受激跃迁和非线性频率变换相位匹配进行了分析。实验结果与理论分析表明,当基频光的性能相对接近时,合理地选择性能较好的非线性晶体对基频光同时进行倍频和和频是获得全固态多波长激光器的一种实用方法,合理地设计激光器谐振腔能够提高激光器的稳定性。     

LD泵浦Cr∶YAG被动调Q556nm黄光激光器

通过对谐振腔镜镀制合理的激光薄膜,成功实现了LD泵浦Nd∶YAG1.112μm激光谱线的运转.利用LBO腔内倍频Nd∶YAG/Cr∶YAG结构获得了高重复频率被动调Q556nm全固态黄光激光器,在注入泵浦功率为1.6W时,得到平均功率51mW,脉冲宽度48ns,重复频率8.9kHz,峰值功率高达119W的脉冲黄光输出.     

6.2 W外腔和频589 nm黄光激光器

 报道了一台800 Hz,6.2 W外腔和频的589 nm黄光激光器。基频激光器均采用双棒串接平平对称腔,增益介质为Nd：YAG晶体,采用声光调Q方式分别获得11.1 W的1 064 nm激光和12.6 W的1 319 nm激光。和频晶体采用三硼酸锂（LBO）,尺寸为4 mm×4 mm×30 mm,采用Ⅰ类非临界相位匹配。将两束激光通过分光镜合束,聚集后注入LBO晶体,获得589 nm黄光最大输出功率为6.2 W,脉宽为50 ns,和频效率26.2%。x方向和y方向的光束质量平方因子分别为3.20和3.61。     

LD抽运腔内和频571.6nm连续波黄光激光器

报道了全固态连续波571.6nm黄光激光器.黄激光是分别由两片Nd∶YAG的1444nm和946nm谱线非线性和频产生,两条谱线在各自晶体对应能级跃迁分别为4F3/2-4I15/2和4F3/2-4I9/2.实验中采用复合腔结构,利用RTP晶体II类临界相位进行内腔和频,当注入到两片Nd∶YAG晶体的抽运功率分别为25W和14.8W时,获得562mW的连续波571.6nm黄激光输出,4h功率稳定度优于±2.9%.     

LD抽运腔内和频571.6 nm连续波黄光激光器

报道了全固态连续波571.6 nm黄光激光器.黄激光是分别由两片Nd∶YAG的1 444 nm和946 nm谱线非线性和频产生,两条谱线在各自晶体对应能级跃迁分别为4F3/2-4I15/2和4F3/2-4I9/2.实验中采用复合腔结构,利用RTP晶体II类临界相位进行内腔和频,当注入到两片Nd∶YAG晶体的抽运功率分别为25 W和14.8 W时,获得562 mW的连续波571.6 nm黄激光输出,4 h功率稳定度优于±2.9％.     

基于扭转模腔的全固态单纵模拉曼黄光激光器设计

输出波长在560~590nm的全固态拉曼黄光激光器是近几年兴起的激光器之一。目前,此类激光器内部多模振荡引起的黄光输出谱线单色性较差的问题还没有得到解决。针对这一情况,提出将扭转模腔与拉曼复合腔相结合的新型解决方案,从根本上消除增益介质中空间烧孔效应引起的基频光多模振荡,实现单纵模黄光输出。拉曼复合腔由L型基频光谐振腔与直线型拉曼谐振腔耦合而成,既保证各个非线性变换过程可充分利用腔内的高功率密度,又可相对独立地对不同波长的光路进行优化调节,从而使整个系统实现最佳输出。该设计有助于在全固态拉曼激光器中实现毫瓦量级的单纵模黄光输出,为基于黄激光的生物医疗、钠导星、空间目标识别等系统提供理想的固体黄光光源。     

A 4.8-W M^2 = 4.6 Continuous-Wave Intracavity Sum-Frequency Diode-Pumped Solid-State Yellow Laser

A yellow continuous wave with beam quality M^2= 4.6 and output power of 4.8 W at 589nm is generated by intracavity sum-frequency mixing of 1064 nm and 1319 nm radiations of a Nd：YAG laser. To achieve high beam quality at high power, thermally near-unstable flat-flat resonators with two-rod birefringence compensation are designed to obtain the large fundamental mode size inside the Nd：YAG rods and the same beam width inside the KTP crystal. The optimal intracavity power ratio of both 1064nm and 1319nm beams is also considered. The output power fluctuation of the yellow laser remains less than 5% in four hours.     

LD抽运Nd∶YVO4自喇曼倍频黄光激光器

报道了LD抽运的自喇曼c切Nd∶YVO4调Q腔内倍频黄光激光器.Nd∶YVO4晶体同时作为激光介质和喇曼晶体，通过声光调Q技术，产生了1 178.7 nm的喇曼激光，经过KTP腔内倍频，输出589.4 nm黄光.测量了平均输出功率随抽运功率和脉冲重复率的变化.典型的1 066.7 nm基频光、1 178.7 nm喇曼光和589.4 nm倍频光的脉冲宽度分别为24.9 ns、11.2 ns和6.8 ns.在脉冲重复率为15 kHz，抽运功率为7.56W时，产生了平均功率为151 mW的589.4 nm光的输出.     

LD泵浦Nd:YVO4/LBO腔内和频连续黄光激光器

用国产半导体激光二极管泵浦Nd:YVO4晶体,通过优化膜系,调节1064 nm谱线的线性损耗以达到与弱谱线1342 nm 增益匹配,在室温下实现1064 nm和1342 nm双波长连续运转,并通过Ⅰ类临界相位匹配LBO晶体腔内和频在国内首次实现593.5 nm黄色激光连续输出,当泵浦注入功率为1.8 W时和频黄激光最大输出达85 mW,光光转换效率为4.7%,功率稳定性24 h内优于±2.8%.     

激光二极管泵浦的Nd：YVO4单频绿光激光器

对激光二极管泵浦单频连续运行的Ｎｄ：ＹＶＯ４腔内倍频激光器进行了理论和实验研究，通过精密调控Ｎｄ：ＹＶＯ４，ＫＴＰ及泵浦泵温度以达到有关参数的最佳匹配，从而获得了较稳定的单横模，单纵模，单偏振的绿光输出，实测最大单频录光功率为７．５ｍＷ，此时会聚磁浦光功率约为４３０ｍＷ，已超过阈值泵浦功率１３倍以上。     

新型全固态激光器作用过程中的激光参数分析

对影响LD泵浦的Nd∶GdVO4,Nd∶YVO4和Nd∶YAG激光器输出特性的增益介质长度、腔内损耗、输出镜透过率、泵浦光和振荡光的光斑大小进行了分析和数值模拟。当腔内固有损耗为2%,输出镜透过率为10%时,Nd∶Gd-VO4,Nd∶YVO4和Nd∶YAG晶体的振荡阈值分别为1.77W、0.55W和3.34W。在25W泵浦功率下,利用1mm长的Nd∶GdVO4,Nd∶YVO4和Nd∶YAG晶体可分别得到13.17W,13.26W和8.43W的输出功率,相应的输出镜最佳透过率分别为24%,44%和16%。     

Diode-pumped 593.5 nm cw yellow laser by type-I CPM LBO intracavity sum-frequency-mixing

A design of LD-pumped Nd:YVO₄ laser that generates simultaneous laser action at wavelengths 1064 and 1342 nm by optimizing film design is presented. An optimized continuous-wave (cw) yellow laser at 593.5 nm in room temperature is obtained for the first time. Using type-I critical phase-matching (CPM)LBO crystal, a yellow laser at 593.5 nm is obtained by 1064 and 1342 nm intracavity sum-frequency mixing. The maximum laser output power of 85 mW is obtained when an incident pump laser of 1.8 W is used. The optical-to-optical conversion is up to 4.7%, and the power stability in 24 h is better than ±2.8%.     

589-nm yellow laser generation by intra-cavity sum-frequency mixing in a T-shaped Nd:YAG laser cavity

To obtain high power 589-nm yellow laser, a T-shaped thermal-insensitive cavity is designed. The optimal power ratio of 1064- and 1319-nm beams is considered and the fundamental spot size distribution from the output mirror to the two laser rods are calculated and simulated, respectively. As a result, a 589-nm yellow laser with the average output power of 5.7 W is obtained in the experiment when the total pumping power is 695 W. The optical-to-optical conversion efficiency from the fundamental waves to the sum frequency generation is about 15.2% and the pulse width is 150 ns at the repetition rate of 18 kHz. The instability of the yellow laser is also measured, which is less than 2% within 3 h. The beam quality factors are Mx^2 = 4.96 and My^2 = 5.08.     

Diode-end-pumped composite Nd:YVO4 yellow laser based on intracavity frequency-doubled self-Raman laser

We report an intracavity frequency-doubled Q-switched self-Raman yellow laser at 587 nm. A composite Nd:YVO₄ crystal was utilized as self-Raman gain medium. The maximum average output power of yellow light obtained was 1.5 W at the incident pump power of 30 W and at a repetition rate of 50 kHz, corresponding to the optical conversion efficiency of 5%. The shortest pulse width, the maximum pulse energy and the highest peak power were measured to be 5.8 ns, 46.7 μJ and 5.9 kW, respectively.