高效高稳定高光束质量声光调Q绿光激光器的研究

通过优化双棒串接直腔结构设计,利用大功率LD侧面抽运、声光Q开关、Ⅱ类相位匹配S-KTP内腔倍频获得高效大功率绿色激光输出.当抽运电流为45 A、重复频率为15 kHz时,激光平均功率为132 W,光—光转换效率为132％,脉宽约为120 ns.在输出130 W时,测得1 h功率不稳定度小于05%,光束质量因子M²为67.对高功率抽运情况下激光介质的热透镜效应以及谐振腔稳定运转工作区域也进行了理论分析和实验研究. 关键词： 绿光激光器 腔内倍频 声光调Q LD侧面抽运     

200 W双谐振腔组合单向输出准连续绿光激光器

研究了最大平均输出功率达206 W的高功率准连续绿光激光器.利用ABCD定律及高斯光束在腔内的自再现条件,分析了激光晶体热透镜效应及热致双折射效应对谐振腔稳定性和输出光束质量的影响.实验中将两个型号相同的LD侧面泵浦激光模块分别置于一个平-凹V型谐振腔和一个平-凹直腔内,形成两束稳定运转的1 064 nm基频光,经过声光Q开关和倍频晶体后,产生两束倍频光,均到达平面折叠镜,最终由平面折叠镜单向重叠输出.当激光模块的泵浦电流为50 A,声光调Q的重复频率为22.4 kHz时,最大平均输出功率为206 W,最大单脉冲能量为9.2 mJ,脉冲宽度为201 ns,峰值功率为45.8 kW的532 nm绿光输出,倍频效率达到60.2%.激光器2 h工作的功率不稳定度优于2.5%.     

LD侧泵Nd:YAG/S-KTP腔内倍频高功率660 nm连续红光激光器

报道了LD侧面泵浦NdYAG/S-KTP腔内倍频高功率660 nm连续红光激光器.泵浦组件(呈三角形等间距分布)由9个20 W的激光二极管组成,最大泵浦功率为180 W.通过对谐振腔参数进行优化设计,用LD连续抽运3 mm×65 mm NdYAG激光棒时,获得了波长为1 319 nm的基频光振荡.利用S-KTP Ⅱ类临界相位匹配腔内倍频技术,当泵浦电流为22 A时,获得了6.8 W的连续红光激光输出,光-光转换效率为4.3%.     

紧凑型激光二极管抽运全固态355 nm连续波紫外激光器

报道了一台激光二极管端面抽运Nd:YVO₄晶体内腔三倍频355 nm激光连续输出的全固态紫外激光器.激光腔采用紧凑型简单凹平直腔,腔长仅为70 mm.利用两块LBO晶体进行腔内倍频、和频,当注入抽运功率为2527 W时,获得最大功率为306 mW的355 nm连续波输出,光光转换效率为012％,输出功率短期不稳定性为53%,355 nm激光输出光束质量良好.通过采用内腔倍频技术和设计合理的腔参数,实现了中小功率连续输出的全固态紫外激光器的小型化、便携化,进一步拓宽了紫外激光器 关键词： 激光二极管端面抽运 内腔三倍频 连续波 355 nm激光     

LD侧面抽运Nd∶YAP腔内三倍频蓝光激光器

研制了一台LD侧面抽运Nd∶YAP腔内三倍频447.1nm脉冲蓝光激光器.采用列阵高频激光二极管侧面抽运Nd∶YAP晶体,使用V型折叠腔,LN晶体电光调Q,输出高峰值功率的1341.4nm偏振基频光.选取KTP晶体Ⅱ类临界相位匹配倍频,获得670.7nm红光.使用LBO晶体Ⅰ类临界相位匹配把670.7nm的倍频光与1341.4nm的基频光进行和频,获得三倍频447.1nm的蓝光输出.实验结果表明:优化后的V型折叠腔,可提高非线性转换效率,在平均抽运功率92.4W时,获得了平均功率887mW、峰值功率17.7kW、脉宽50ns的偏振蓝光输出,光-光转换效率为0.96%.     

LD侧面抽运Nd:YAP腔内三倍频蓝光激光器

研制了一台LD侧面抽运Nd:YAP腔内三倍频447.1 nm脉冲蓝光激光器.采用列阵高频激光二极管侧面抽运Nd:YAP晶体,使用V型折叠腔,LN晶体电光调Q,输出高峰值功率的1 341.4 nm偏振基频光.选取KTP晶体Ⅱ类临界相位匹配倍频,获得670.7 nm红光.使用LBO晶体Ⅰ类临界相位匹配把670.7 nm的倍频光与1 341.4 nm的基频光进行和频,获得三倍频447.1 nm的蓝光输出.实验结果表明：优化后的V型折叠腔,可提高非线性转换效率,在平均抽运功率92.4 W时,获得了平均功率887 mW、峰值功率17.7 kW、脉宽50 ns的偏振蓝光输出,光-光转换效率为0.96%.     

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     

高效率LD端面抽运准连续355nm激光器

报道了一台激光二极管(LD)端面抽运Nd∶YVO4晶体腔内倍频和腔外和频相结合的声光调Q准连续355 nm紫外激光器。采用LD端面抽运双侧翼键合YVO4基质的Nd∶YVO4晶体,在腔内置入Ⅰ类相位匹配的LiB3O5(LBO)晶体进行倍频实现1 064 nm和532 nm双波长准连续激光输出,通过消色差透镜将双波长激光聚焦耦合到Ⅱ类相位匹配的LBO晶体中进行和频,并采用双向和频光路,获得了高效率、高光束质量、高重复频率的准连续355 nm紫外激光输出。在抽运功率为28.6 W、重复频率为20 kHz时,355 nm激光最大输出功率4.2 W,脉宽为20.6 ns,光-光转换效率为14.7%,激光器光束质量因子Mx2和My2分别为1.29和1.23。     

紧凑型LD端面抽运Nd:YAG内腔三倍频准连续355 nm紫外激光器

报道了一台LD端面抽运Nd:YAG晶体内腔三倍频355 nm激光高效率、高峰值功率准连续输出的全固态紫外激光器.激光腔采用紧凑型平平直腔,腔长仅106 mm.当注入抽运功率为5.73 W、重复频率为9 kHz时,获得163 mW的355 nm激光准连续输出,光光转换效率达到最高2.84％.当注入抽运功率为6.7 W重复频率为5 kHz时,获得最高174 mW的355 nm激光准连续输出,输出功率短期不稳定性为5％,光束质量因子M²为3.79.当注入抽运功率为5.73 W、重复频率为2 kHz时,获得112 mW的355 nm激光准连续输出,峰值功率最高达到9.15 kW.通过采用内腔倍频技术和设计合理的腔结构,实现了中小功率准连续输出的全固态紫外激光器的小型化、便携化,进一步拓宽了紫外激光器的应用领域. 关键词： LD端面抽运 内腔三倍频 Q')" href="#">声光调Q 紫外激光     

LD侧泵Nd∶YAG/S-KTP腔内倍频高功率660nm连续红光激光器

报道了LD侧面泵浦Nd∶YAG/S-KTP腔内倍频高功率660nm连续红光激光器。泵浦组件（呈三角形等间距分布）由9个20W的激光二极管组成，最大泵浦功率为180W。通过对谐振腔参数进行优化设计，用LD连续抽运3mm×65mm Nd∶YAG激光棒时，获得了波长为1319nm的基频光振荡。利用S-KTP II类临界相位匹配腔内倍频技术，当泵浦电流为22A时，获得了6.8W的连续红光激光输出，光-光转换效率为4.3％。     

LD端面泵浦腔内倍频Yb:YAG绿光激光器

报道了一种激光二极管(LD)端面泵浦10at%掺杂Yb:YAG激光晶体(4×4×1mm)和Ⅰ类临界相位匹配LBO的腔内倍频全固态绿光激光器.为了克服"绿光问题",采用了两个激光二极管偏振耦合系统.在双路泵浦功率为1.2W时,获得最高功率为40mW525nm的连续基模激光输出.在腔内插入Cr4+:YAG饱和吸收体被动调Q,在泵浦功率为1.2W时,可以获得平均功率为5.2mW,脉冲重复频率为2.44kHz,脉冲宽度为51.5ns,峰值功率为41.7W的515nm脉冲激光输出.输出波长发生变化,而且515nm脉冲激光输出的阈值仅为728mW.     

高稳定LD端面泵浦腔内倍频Nd∶YVO4/LBO连续红光激光器

设计出一种能够较好地补偿激光晶体热效应的激光谐振腔,实现了高稳定LD单端泵浦LBO腔内倍频Nd∶YVO4连续红光激光器.当晶体吸收的泵浦功率为24.56 W时,671 nm激光功率达到1.203 W,光-光转换效率4.9%,激光模式为TEM00模.在输出功率为1.08 W时,激光器1 h功率不稳定度为0.52%.     

LD端面泵浦腔内倍频Yb∶YAG绿光激光器

报道了一种激光二极管（LD）端面泵浦10at％掺杂Yb∶YAG激光晶体（4×4×1 mm）和Ⅰ类临界相位匹配LBO的腔内倍频全固态绿光激光器.为了克服“绿光问题”,采用了两个激光二极管偏振耦合系统.在双路泵浦功率为1.2 W时,获得最高功率为40 mW 525 nm的连续基模激光输出.在腔内插入Cr4＋:YAG饱和吸收体被动调Q,在泵浦功率为1.2 W时,可以获得平均功率为5.2 mW,脉冲重复频率为2.44 kHz,脉冲宽度为51.5 ns,峰值功率为41.7 W的515 nm脉冲激光输出.输出波长发生变化,而且515 nm脉冲激光输出的阈值仅为728 mW.     

高稳定LD泵浦腔内倍频Nd∶YVO4/KTP连续绿光激光器

设计出一种能够较好地补偿激光晶体热效应的激光谐振腔，实现了高稳定LD单端泵浦KTP腔内倍频Nd∶YVO₄连续绿光激光器.当晶体吸收的泵浦功率为24.56 W时，532 nm激光功率达到5.3 W，光-光转换效率达到21.6％，激光模式为TEM00模.在输出功率5W左右时，激光器1 h功率不稳定度优于0.6％     

93.7 W 1112 nm diode-side-pumped CW Nd:YAG laser

We demonstrate a high power continuous wave (CW) infrared laser operated at 1112 nm from a diode side-pumped Nd:YAG crystal with a plano-plano symmetrical resonator. By inserting an etalon, an output power of as high as 93.7 W at 1112 nm was obtained at the pump power of 570 W with conversion efficiency of 16.4%. The beam quality factor of M² was measured to be about 17. The wavelength tunable performance of the etalon was also analyzed. To the best of our knowledge, it is the highest output power at 1112 nm CW laser based on Nd:YAG crystal.     

Laser diode end-pumped Yb:YAG/LBO green laser

With a type-I critical phase-matching LBO crystal, an intracavity frequency doubled solid-stated Yb:YAG green laser is reported. Using a plano-concave resonator, with pump power of 1.37 W, 24.5 mW TEM₀₀ continuous wave laser at 525 nm was obtained. The optical conversion efficiency is 1.8%. By adjusting the placed angle of LBO, several lasers wavelength from 525.0 to 537.8 nm could be extracted. The maximum output power at 537.8 nm is 3.1 mW.     

高效率Nd:YVO4/LBO临界相位匹配脉冲绿光激光器

报道了一种利用激光二极管（LD）端面泵浦Nd:YVO4晶体,声光调Q,LBO临界相位匹配腔内倍频的高效率、小体积、风冷绿光激光器。分析了不同偏振光泵浦的情况下,激光晶体对泵浦光的吸收特性。由分析得出,采用部分偏振光泵浦,可以提高激光晶体对泵浦光吸收均匀性,改善基波畸变,获得高转换效率激光输出。实验中,在泵浦光功率为33 W、声光调Q重复频率为20 kHz时,得到脉宽为23.96 ns、平均功率为15 W的1064 nm基频光输出。经倍频后,得到平均功率为11.2 W的绿光输出,倍频效率为74.6%,总体光-光转换效率为34%。在输出功率为10 W时,测得1 h内输出功率不稳定度为0.512 2%,水平方向和竖直方向的光束质量因子M2分别为1.2和1.1。     

High-power continuous wave green beam generation by use of simple linear cavity with side-pumped module

High-power continuous wave green radiation has been generated by means of type-II phase-matched frequency doubling in a KTP crystal located in a simple linear cavity incorporating a diode side-pumped Nd:YAG laser module. The cavity was designed to make the fundamental beam radius at the KTP crystal smaller than that at the gain medium, as is required for obtaining large mode volume in Nd:YAG crystal and realizing efficient CW intracavity frequency doubling. Output power of 51.2 W is obtained in the experiment with a diode-to-green optical conversion efficiency of 10.3%. The M²-parameters of the laser are measured at different output powers. For the output power of about 47 W, the power fluctuation is measured less than 1%. The experimental results show that the continuous wave green laser system using this simple linear cavity offers good laser performance and output stability.     

High power and high beam quality CW green beam generated by diode-side-pumped intracavity frequency doubled Nd:YAG laser

We report a stable high power and high beam quality diode-side-pumped CW green laser from intracavity frequency doubled Nd:YAG laser with LBO crystal. By using a advanced resonator, a large fundamental mode size in the laser crystal and a tight focus in the nonlinear crystal could be obtained simultaneously, which are favorable for high power and high beam quality CW green laser generation. The green laser delivered a maximum 532 nm output power of 40 W. The corresponding optical-to-optical conversion efficiency and electrical-to-optical conversion efficiency were 8.6% and 5.0%, respectively. Under 532 nm output power of 34 W, the beam quality factor was measured to be 1.6.     

LD end-pumped intracavity frequency doubled Yb:YAG laser

A laser diode end-pumped 10 at.% doped Yb:YAG microchip crystal intracavity frequency doubled all solid-stated green laser is reported in this paper. Using one plano-concave resonator, with the pump power of 1.2 W, 44.2 mW TEM₀₀ continuous wave (CW) laser at 525 nm was obtained, the optical conversion efficiency was about 3.7%. When a Cr:YAG crystal with initial transmission of 95.5% inserted in the resonator, the maximum output power of 6.4 mW, pulse duration width of 49.1 ns, pulse repetition rate of 2.45 kHz, and peak power of 53.1 W at 515 nm were achieved when the pump power was 1.2 W. The wavelength changed from 525 nm to 515 nm and the threshold was only 725 mW.