一阶准相位匹配周期性极化铌酸锂倍频产生18 mW绿光连续输出

通过高压脉冲电场极化 ,制备了周期为 6 5 μm、长为 12mm、宽为 10mm、厚为 0 5mm的一阶准相位匹配周期性极化铌酸锂 ;由 1 1W连续 1 0 6 μmNd∶YAG激光器抽运 ,在 5°时产生了约 18mW、0 .5 32 μm的倍频连续绿光 ,其对应的二次谐波转换效率约为 1 6 % ,二次谐波的归一化转换效率约为 1 5 %cm- 1 W- 1 ,相当于 79%的周期性极化铌酸锂的理想非线性系数。测量了抽运光功率与倍频光功率的关系     

PPLT倍频宽线宽掺镱双包层光纤放大激光

分别通过理论和实验研究了周期性极化的钽酸锂（PPLT）倍频宽线宽准连续掺镱双包层光纤放大激光.PPLT样品长为40 mm,极化周期为7.67 μm.基频光的中心波长为1064 nm,线宽约为6 nm.从基频光的光谱特性出发,利用超晶格倍频理论,解释了实验中获得的倍频温度与二次谐波功率之间的关系.在基频光的功率为2.2 W时,获得的宽线宽光纤激光倍频效率为1.8%.     

准相位匹配周期极化掺镁铌酸锂490 nm倍频连续输出

在室温下通过外加电场极化法,首次用较低的极化开关电场～5.5 kV/mm,在厚为1 mm、长为20 mm、宽为18 mm的掺镁铌酸锂基片上成功的制备了周期为4.8～5.2 μm的一阶准相位匹配倍频光学微结构;并在室温下,以波长为980 nm的半导体激光器为基频光源,对所研制的微结构样品进行倍频通光实验,在入射基频光为800 mW时,产生约40 mW的490 nm的倍频光,其对应转换效率为5%,实验过程中未见绿致吸收光折变现象.     

基于周期极化化学计量比掺氧化镁钽酸锂晶体的高效率、单程、连续外腔倍频

利用长度为20mm的周期极化化学计量比掺氧化镁钽酸锂晶体（PP-MgO: SLT），实现了转换效率为11.8%的单程连续外腔准相位匹配（QPM）倍频，此时1064nm基频光的输入功率为7.69W，获得的532nm倍频光的输出功率为905mW。实验中可以发现，在不同的基频光聚焦条件和输入功率下，对应最大倍频输出的晶体温控炉的设定温度也要随之改变。此外，对允许角和允许温度也进行了研究，实验结果和理论结果符合的很好。     

准相位匹配周期极化高掺镁铌酸锂532 nm倍频准连续输出研究

对周期性极化高掺镁铌酸锂倍频过程进行了准相位匹配倍频理论研究。在室温下通过外加电场极化法,用较低的极化开关电场～5．5kV／mm,在厚为1mm、长为10mm、宽为10mm的掺镁铌酸锂基片上成功地制备了周期为5．8～7．3pm(间隔0．3pm)的一阶准相位匹配倍频周期性极化光学微结构。将温度控制在70℃左右,以波长为1．060μm的Nd：YAG激光为基频光源,对所研制的光学微结构样品进行倍频通光实验验证。当入射基频光为920mW时,可以获得约15mW的532nm准连续倍频蓝光输出．其归一化转换效率高达1．77％／W。     

周期极化KTiOPO4晶体连续倍频绿光输出

采用外加电场极化方法，在Z切1mm厚的KTiOPO4晶体中实现了周期性极化反转。晶体的极化反转周期为9．0／μm，相互作用长度为3mm。波长为1．064μm的基频光功率为900mW，晶体中心温度为32℃时，获得0．532μm、22μW的倍频绿光输出，二次谐波转换效率为0．0024％。     

LD侧面抽运Nd∶YAG多波长激光器

利用单根Nd∶YAG晶体棒,实现1 064 nm和1 319 nm双波长基频光振荡及其倍频光532 nm、660 nm激光的输出.采用LD侧面抽运单根Nd∶YAG晶体棒实现1 064 nm和1 319 nm基频光振荡,在此基础上使用非线性频率变换技术获得532 nm和660 nm倍频光的输出.结果表明:1 064 nm和1 319 nm基频激光同时输出时功率分别为30.5 W和8.78 W,单独输出时功率分别为35.6 W和11.2 W|在声光调Q频率分别为10.5 kHz和20.5 kHz时,获得了功率分别为5.34 W和1.353 W的532 nm激光和660 nm激光两路同时运转输出、功率分别为6.72 W和1.902 W各路单独输出,两种情况下倍频转换效率均为17.5%和15.4%,不稳定度小于2%.     

全固态飞秒激光高光束质量三倍频研究(特邀)

对全固态飞秒激光三倍频产生高光束质量343 nm飞秒激光进行了系统研究。基频光源为脉冲宽度为105 fs、重复频率为76 MHz、中心波长为1 030 nm的商用Yb:KGW锁模激光器,利用1.7 mm长LBO晶体获得60%的二倍频转换效率,然后分别研究了基于BBO晶体Ⅱ类相位匹配和Ⅰ类相位匹配的三倍频产生。在基频光功率为5 W的条件下,利用Ⅱ类相位匹配的BBO晶体,获得的最大平均功率为0.71 W,三倍频转换效率约为14%;利用Ⅰ类相位匹配的BBO晶体,获得平均功率为1.01 W的紫外激光输出,三倍频转换效率为20.2%。获得的343 nm紫外激光的光束质量优于1.3。     

PPKTP晶体半整体谐振腔倍频的397.5nm紫外激光输出

外腔谐振倍频是获得397.5 nm紫外激光的重要方法。搭建了基于周期极化的磷酸氧钛钾(PPKTP)晶体的半整体谐振腔,对经半导体锥型放大器放大的795 nm单频连续激光进行谐振倍频。在203 m W的795 nm基频光输入条件下,实现了60.4 m W的397.5 nm连续单频紫外激光输出,倍频转化效率为30%;在基频光功率约87.5 m W时,得到最大的倍频效率约为34.6%。倍频紫外光光束质量因子M2优于1.21,光束质量良好,30 min内典型的倍频光功率均方根起伏小于1.9%。该倍频器结构紧凑,具有很好的机械稳定性,可实现紫外激光的稳定输出,可用于产生对应铷原子跃迁线的压缩、纠缠态光场,在量子光学和精密测量等领域发挥重要作用。     

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     

A Micro Blue-violet Laser by Frequency Doubling of Semiconductor Laser

In this paper, a micro blue-violet laser by frequency doubling of a semiconductor laser with a new nonlinear organometallic complex cadmium mercury thiocyanate crystal (CMTC) is reported. At room temperature, the blue-violet laser output of 11.8 mW at 404 nm and the conversion4efficiency of the second harmonic generation (SHG) of 0. 60% were obtained with a 1. 98 W, 808 nm semiconductor laser and a 4 mm crystal.     

A Micro Blue-violet Laser by Frequency Doubling of Semiconductor Laser

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利用椭圆高斯光束产生266nm紫外连续激光

本文采用商用532 nm激光器作为基频光源,利用偏硼酸钡(β-BBO)晶体进行外腔倍频,实现了266 nm连续激光的高效输出.文中详细模拟了BBO晶体中的束腰形状对倍频效率的影响,仿真和实验结果均表明椭圆高斯光束可以有效改善走离效应,提高倍频转换效率.通过优化蝶形倍频腔,可以使椭圆高斯光束在腔内共振,当1 W基频光输入时可输出约180 mW的266 nm紫外连续激光,倍频转换效率达到18%.     

1560 nm连续光半导体激光器经PPLN倍频及经铷吸收光谱稳频

将激光器锁定到合适的参考频率上,可以有效地改变激光器的频率稳定性。1560 nm的分布反馈式半导体激光器,可以通过倍频锁定于铷原子吸收线上。实验中我们利用PPLN准位相匹配晶体进行倍频,当输入光为1.6 W时可以获得25 mW的倍频光,非线性转换系数为0.96%/W。我们还将激光器的频率锁定于Rb原子的吸收线上,30 s内剩余频率起伏约为±3.5 MHz。     

Compact high conversion efficiency Nd:YAG/LBO green laser using unstable V cavity

We demonstrated a 36.9 W green laser with an intra-cavity second harmonic generation. A compact unstable V type cavity was adopted to compress the whole cavity configuration. The type I phase-matching LiB₃O₅ was used as the nonlinear crystal in the second harmonic generation. The 36.9 W average power and 38 ns pulse width of 532 nm green laser was obtained at a repetition rate of 10.3 kHz, corresponding to a peak power of 94 kW. The optical to optical conversion efficiency from diode to green and from IR to green laser was about 19.8 and 82%, the whole cavity length is about 300 mm. To the best of our knowledge, this is the shortest cavity configuration of side pump green system with output power higher than 30 W and IR to green conversion efficiency larger than 80%. The output fluctuation of this system was less than 3% in 2 h.     

Generation of femtosecond laser pulses at 396 nm in K_3B_6O_(10)Cl crystal

K_3B_6O_(10)Cl(KBOC), a new nonlinear optical crystal, shows potential advantages for the generation of deep ultraviolet(UV) light compared with other borate crystals. In this paper we study for the first time the second harmonic generation(SHG) of a femtosecond Ti:sapphire amplifier with this crystal. Laser power is obtained to be as high as 220 m W at the central wavelength of 396 nm with a 1-mm-long crystal, and the maximum SHG conversion efficiency reaches 39.3%. The typical pulse duration is 83 fs. The results show that second harmonic(SH) conversion efficiency has the room to be further improved and that the new nonlinear crystal is very suited to generate the high efficiency deep ultraviolet laser radiation below 266 nm.     

Second harmonic generation in periodically poled LiNbO3 waveguides formed by oxygen‐ion implantation

Planar and channel waveguides were fabricatied in periodically poled lithium niobate crystals by 6 MeV O‐ion implantation. Single‐pass second harmonic generation was carried out. A conversion efficiency of 34.5%/(W · cm²) was achieved in the channel waveguide, and 1.11 mW second harmonic light at 492.5 nm was generated. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

LD抽运Nd:Gd1-xYxVO4连续波激光器的实验研究

报道了一种半导体二极管(LD)抽运Nd:Gd1-xYxVO4晶体,采用简单、结构紧凑的平-平腔设计,实现了1.06 μm连续波激光输出,在8 W的注入功率下,获得3.25 W的1.06 μm连续波激光输出,光-光转换效率为41%,斜效率为45%.KTP腔内倍频实现了稳定的连续波532 nm绿光激光运转,当注入功率为8 W时,单向获得了621 mW的单模绿光输出.     

Generation of ultraviolet radiation with wide angular tolerance in cesium lithium borate crystal

Tangential phase-matching has been realised in cesium lithium borate (CLBO) crystal for the first time for the generation of fourth harmonic (266 nm) of Nd:YAG and third harmonic (226.7 nm) of a dye laser radiation by second harmonic generation and sum-frequency mixing with the angular tolerance as large as 22 mrad and 21 mrad respectively, over one of the interacting beams. An energy conversion efficiency of 15% for fourth harmonic generation is obtained with a 5.5 mm thick crystal and with the average pump powers only 170 and 70 mW. A set of Sellmeier dispersion equations for the CLBO crystal have also been formulated.     

555 nm laser sources based on intracavity frequency doubling of Nd:YGG laser

We report for the first time a yellow-green laser at 555 nm generation by intracavity frequency doubling of a continuous wave (CW) laser operation of a 1110 nm Nd-doped yttrium gallium garnet (Nd:YGG) laser under in-band diode pumping at 808 nm. An LBO crystal, cut for critical type I phase matching is used for second harmonic generation of the laser. At an incident pump power of 18.5 W, as high as 2.31 W of CW output power at 555 nm is achieved. The optical-to-optical conversion efficiency is up to 12.4%, and the fluctuation of the yellow-green output power was better than 2.8% in the given 4 h.