Diode-end-pumped Nd：YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave(CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd:YVO4 and using LBO as the intra-cavity SHG crystal.With the optimization of laser cavity and crystal parameters,the laser operates at a very high efficiency.When the pumping power is about 31 W,the output at 457 nm reaches 4.2 W,and the optical to optical conversion efficiency is about 13.5% accordingly.The stability of the output power is better than 1.2% for 8 h continuously working.     

Efficient Mode-locked and Q-switched Nd ： YVO4 Laser with Semiconductor Saturable Absorber Mirror

We reported an efficient diode pumped Nd ： YVO4 1 064 nm laser passively mode-locked and Qswitched by a semiconductor saturable absorber mirror（SESAM）. At the incident pump power of 7. 5 W, 2.81 W average output power was obtained during stable CW mode locking with a repetition rate of 111 MHz. The optical conversion efficiency was 37.5%, and the slope efficiency was 39%. So far as we know, this is the highest optical-optical conversion efficiency with a SESAM at home.     

Efficient Mode-locked and Q-switched Nd∶YVO4 Laser with Semiconductor Saturable Absorber Mirror

We reported an efficient diode pumped Nd∶YVO4 1 064 nm laser passively mode-locked and Q-switched by a semiconductor saturable absorber mirror(SESAM). At the incident pump power of 7.5 W, 2.81 W average output power was obtained during stable CW mode locking with a repetition rate of 111 MHz. The optical conversion efficiency was 37.5%, and the slope efficiency was 39%. So far as we know, this is the highest optical-optical conversion efficiency with a SESAM at home.     

Passive mode locked diode-pumped Nd：GdYVO4 laser with a GaAs absorber

A passively Q-switched mode-locked Nd:GdYVO4 laser is successfully demonstrated by using a piece of GaAs crystal grown at low temperature as the passively saturated absorber and the output coupler. Fundamental properties of the Nd: GdYVO4 laser are investigated. The maximum average output power of 3.5 W is obtained by using plainsphere when the incident pumping power is 10 W,which corresponds to an optical-optical coversion efficiency of 35%. The threshold power for the Q-switching mode-locked is 1.2 W. The maximum average output power of 1.72 W is obtained by using GaAs when the incident pumping power is 10 W,mode-locked pulse train with a repetition rate of ～113 MHz is achieved. At the incident laser pumping power of 7 W,the modulation depth is 100%.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave （CW） 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd： YVO4 and using LBO as the intra-cavity SHG crystal. With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457 nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the output power is better than 1.2% for 8 h continuously working.     

1400—1500nm．Different Material-doped Raman Fiber Lasers Pumped by Nd：YVO4 Laser

Different material-doped Raman fiber lasers with very high efficiency operatingin continuous-wave are presented. With 1 W Nd :YVO4 laser pumping at wavelength of 1342 nm,single mode output power of above 500 mW (optical-to-optical conversion efficiency of 50%) is simulated in the range of 1 400-1500 nm. Using high-germanium,phosphate and high- borate silicate fibers as the gain medium, laser output at wavelengths of 1 420,1450,1480 and 1495 nm can be achieved with different geometries, which are just as pumping C-band and L-band distributed Raman fiber amplifiers.     

A green laser at 517 nm based on intracavity frequency doubling of the diode-pumped Yb:LO laser

We report for the first time, to our knowledge, the diode-pumped continuous-wave （CW） thin-disk Yba＋-doped Lu203 （Yb：LO） laser at 1 034 nm and the second-harmonic generation at 517 nm. With a 6.3% output coupler, the maximum output power is 1.17 W under a pump power of 18.5 W. Moreover, the intracavity second-harmonic generation （SHG） is also -achieved with power of 193 mW at 517 nm by using an LiB305 （LBO） nonlinear crystal. The beam quality fac- tor M2 is about 1.28. The fluctuation of the output power is about 3% in 1 h.     

Passive mode locked diode-pumped Nd:GdYVO4 laser with a GaAs absorber

A passively Q-switched mode-locked Nd：GdYVO4 laser is successfully demonstrated by using a piece of GaAs crystal grown at low temperature as the passively saturated absorber and the output coupler. Fundamental properties of the Nd： GdYVO4 laser are investigated. The maximum average output power of 3.5 W is obtained by using plainsphere when the incident pumping power is 10 W, which corresponds to an optical-optical coversion efficiency of 35%. The threshold power for the Q-switching mode-locked is 1.2 W. The maximum average output power of 1.72 W is obtained by using GaAs when the incident pumping power is 10 W, mode-locked pulse train with a repetition rate of - 113 MHz is achieved. At the incident laser pumping power of 7 W, the modulation depth is 100%.     

Diode-pumped Doubly Q-switched Nd∶YAG Laser with Acoustic-optical Modulator and Cr~(4+)∶YAG Saturable Absorber

A diode-pumped doubly Q-switched Nd∶YAG laser operating at 1064nm both with an acoustic-optical(AO)modulator and Cr4+∶YAG saturable absorber in the cavity is demonstrated.At the incident pump power of 11.8W the laser can generate stable 8ns pulse with the peak power of 23.6kW at a 10kHz repetition rate.The pulse temporal profile is more symmetric and shorter compared with that of passively Q-switched lasers with only AO-active and Cr4+∶YAG.A reasonable analysis is developed to explain the experimental resul...     

Study on the Pr:KYF ultraviolet laser at 305 nm pumped by blue laser

An all-solid-state Pr:KY3F10(Pr:KYF) laser pumped by blue laser(471 nm) has been demonstrated.With the incident pump power of 2.6 W,the maximum output power at 610 nm is 213 mW.Moreover,the intracavity second-harmonic generation(SHG) is also achieved with the maximum ultraviolet(UV) power at 305 nm of 11 mW by using a β-BaB2O4(BBO) nonlinear crystal.     

3.6W全固态腔内和频Nd∶YVO4橙黄激光器

报道了一种采用光纤耦合激光二极管阵列(LDA)端面泵浦Nd∶YVO4激光晶体、Ⅰ类临界位相匹配BiB3O6(BiBO)腔内和频实现全固态连续橙黄色激光输出的实验结果。波长为593.5 nm的橙黄色激光是由Nd∶YVO4晶体1064 nm和1342 nm双波长非线性和频产生的。当泵浦功率为27.5 W时,得到橙黄色激光最大输出功率3.6 W,光-光转换效率高达13.2%,据我们所知,这是目前利用腔内和频Nd∶YVO4激光器获得593.5 nm橙黄色激光输出的最高效率。     

激光二极管抽运复合腔和频连续波589 nm激光器

报道了一种利用复合腔进行腔内和频的589nm激光器.激光器由两个子谐振腔组成.在两个子谐振腔中,分别利用两个激光二极管(LD)抽运Nd∶YAG晶体和Nd∶YVO4晶体,并分别选择1319 nm波长(对应Nd∶YAG晶体的4F3/2→4I13/2跃迁)与1064 nm波长(对应Nd∶YVO4晶体的4F3/2→4I11/2跃迁)振荡进行和频.通过谐振腔的优化设计,实现了腔内两个波长较好的模式与增益匹配.在两个子腔的交叠部分,利用BiB3O6(BIBO)晶体Ⅰ类临界相位匹配进行腔内和频,得到和频激光输出.当Nd∶YAG与Nd∶YVO4晶体上抽运功率分别为750 mW和600 mW时,获得了24 mW,589 nm黄橙激光输出.该输出激光光束质量好、噪声低.     

LD抽运Nd:YVO_4腔内倍频连续波8.8W绿光激光器

报道了用 LD双向抽运 Nd:YVO4晶体 ,KTP作腔内倍频的大功率绿光激光器。通过对大功率抽运情况下所产生的热透镜效应进行分析和估算 ,优化了热稳腔参数 ,获得了较稳定的功率输出。在抽运功率为 2 8W时 ,获得最大连续波绿光输出 8.8W,光 -光转换效率达 31 .5%。     

全固态复合内腔和频613nm连续波橙光激光器

报道了全固态连续波613nm橙光激光器,橙激光是分别由Nd:YAG和Nd:YVO4晶体的1444nm和1064nm谱线非线性和频产生的,两条谱线在各自晶体对应能级跃迁分别为4F3/2-4I13/2和4F3/2-4I11/2.实验中采用复合腔结构,利用KTP晶体Ⅱ类临界相位进行内腔和频,当注入到Nd:YAG和Nd:YVO4晶体的泵浦功率分别为20W和10W时,获得344mW的TEM00连续波613nm橙激光输出.4h功率稳定度优于±2.8%.     

LD泵浦6.8W连续Nd:YVO4/LBO 671nm红光激光器

报道了一种光纤耦合半导体激光二极管(LD)阵列端面抽运Nd∶YVO4晶体,腔内Ⅰ类临界相位匹配LBO(LiB3O5)晶体倍频,实现波长为671nm的全固态红光激光器瓦级连续输出的理论分析和实验结果.采用短三镜折叠腔结构,通过对激光晶体热效应的考虑,估算其热透镜焦距,用计算机优化设计选取合适谐振腔参数,在26W的注入泵浦功率下,获得了连续输出6.8W、波长为671nm的红光基模稳定输出,光-光转化效率达到26%.     

全固态高输出功率单频Nd:YVO4/KTP激光器

利用光纤耦合输出的半导体激光器(LD)端面抽运Nd∶YVO4晶体,激光谐振腔采用四镜环形腔结构,通过KTP晶体内腔倍频,获得了高功率全固态连续单频绿光激光输出。根据临界相位匹配下椭圆高斯光束的倍频理论,通过旋转Nd∶YVO4晶体的方向选取合适的基频光偏振方向,使KTP晶体的走离角所在平面与谐振腔弧矢面平行,可提高内腔倍频转换效率。当抽运功率为20 W时,激光器最大单频绿光输出功率达4.8 W。作为对比,控制基频光偏振方向使KTP晶体的走离角所在平面与谐振腔子午面平行时,激光器最大单频绿光输出功率为4.1 W。对比两种情形下的实验结果,激光器的光-光转换效率从21.8%提高到25.5%。     

850mW全固态腔内和频554．9nm连续黄光激光器

报道了全固态连续波554．9nm黄光激光器,黄激光是分别由Nd：YAG和Nd：YVO4晶体的1342nm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-^4I11／2和^4F3／2-^4I9/2。实验中采用复合折叠腔结构,利用LBO晶体I类临界相位进行内腔和频,当注入到Nd：YAG和Nd：YVO4晶体的泵浦功率分别为20W和8W时,获得850mW的TEMoo连续波554．9nm黄激光输出。4小时功率稳定度优于±2．5%.     

复合腔和频554.8 nm黄-绿光激光器

介绍了一种光纤耦合激光二极管阵列(LDA)同时泵浦Nd:YAG和Nd:YVO4晶体输出554.8nm连续波的全固态黄-绿光激光器。黄-绿激光是由Nd:YAG晶体的946nm激光和Nd:YVO4晶体的1342nm激光非线性和频产生,两条谱线在各自晶体的对应能级跃迁分别为4F3/2-4I9/2和4F3/2-4I13/2。实验中采用复合腔结构,利用KTP晶体II类临界相位匹配进行腔内和频,当注入到Nd:YAG和Nd:YVO4晶体的泵浦功率分别为30W和20W时,获得了1.13W的连续波554.8nm黄-绿激光输出,光束质量因子M2<1.22,这是目前为止该波长已见报道的最高功率输出值。实验结果表明:采用Nd∶YAG和Nd∶YVO4两种激光晶体进行腔内和频是获得黄-绿激光的高效方法,并可以应用到其他两种激光晶体进行腔内非线性和频,获得更多不同波长的激光输出。     

LD泵浦和频593 nm黄光激光器

报道了一种单LD泵浦Nd:YVO4双晶体腔内和频实现黄光激光的有效方法,并对其进行了理论分析、实验装置的设计和实验验证。该装置由半导体激光器、光学耦合系统(CO)、Nd:YVO4镀膜晶体、镀高反膜的平凹镜、镀增透膜的LBO、镀高透膜的全反镜组成。实验采用V型谐振腔,在中心波长为808.7 nm、5 W抽运功率下,利用Ⅰ类临界相位匹配LBO作为和频晶体,获得了244 mW、593 nm的黄光输出,光-光转换率为4.9%,激光不稳定度为5%。实验结果表明:采用V型谐振腔进行腔内和频,可以获得593 nm的黄光激光,并且结构紧凑、转换效率高,可以应用到很多种和频激光器中。     

激光二极管抽运Nd:YVO4晶体五倍频213 nm深紫外激光器

报道了一种声光调Q激光二极管抽运Nd：YVO4晶体腔外五倍频213nm深紫外全固态激光器。实验上分别利用KTP和两块BBO晶体产生532nm倍频绿光，266nm紫外四倍频以及基波与四倍频的混频，实现了从Nd：YVO4近红外激光到213nm深紫外激光的频率变换。在10．3W抽运功率下，获得平均输出功率3．1mW，脉宽7．5ns的213nm深紫外激光输出。