473 nm和946 nm双波长输出的全固态Nd:YAG激光器

设计并实现了473 nm和946 nm双波长输出的全固态Nd:YAG激光器.利用激光二极管端面泵浦Nd:YAG晶体,在三镜折叠谐振腔中插入Brewster窗片作为起偏器,通过周期极化晶体PPKTP内腔倍频获得473 nm蓝光输出.同时利用Nd:YAG激光晶体的热退偏效应,把Brewster窗片作为基频光输出耦合镜,实现946 nm激光输出.通过调谐PPKTP的温度,优化了倍频光和基频光的输出功率.泵浦功率25W时,实验获得了1.8W的473 nm倍频蓝光和0.8W的946 nm基频激光输出.     

角锥型全固态非平面环形激光器473 nm单频运转

提出并实现了由热键合直角棱镜与角锥棱镜构成的新型946 nm及473 nm单频非平面环形激光器.直角棱镜由无掺杂的YAG晶体和2 mm厚的Nd∶YAG晶体热键合形成,可提供激光增益、光路闭合及对946 nm激光起偏等多种复合功能.角锥棱镜由熔融石英材料构成,在环形永磁铁作用下,提供法拉第旋转作用.实验上实现了该结构的946 nm腔内倍频,并获得了473 nm单频单向激光输出.     

角锥型全固态非平面环形激光器473 nm单频运转

提出并实现了由热键合直角棱镜与角锥棱镜构成的新型946 nm及473 nm单频非平面环形激光器.直角棱镜由无掺杂的YAG晶体和2 mm厚的Nd∶YAG晶体热键合形成,可提供激光增益、光路闭合及对946 nm激光起偏等多种复合功能.角锥棱镜由熔融石英材料构成,在环形永磁铁作用下,提供法拉第旋转作用.实验上实现了该结构的946 nm腔内倍频,并获得了473 nm单频单向激光输出.     

LD泵浦Nd:YAG/LBO蓝光激光器的低噪声运转

观察了LD泵浦Nd:YAG晶体,I类临界相位匹配LBO晶体腔内倍频的473nm蓝光激光器的噪声特性,指出蓝光噪声主要来自于不同纵模的相互耦合,并用双折射滤光片技术实现了全固态蓝光激光器的低噪声稳定运转在1.3W的泵浦功率下,获得了58mW的蓝光低噪声稳定输出.     

LD泵浦355nm准连续紫外激光器

报道了一台LD侧面泵浦Nd:YAG晶体的内腔三次谐波转换的全固态准连续紫外激光器。在谐振腔内,1064nm的基频波通过对Ⅱ类相位匹配KTP晶体进行二倍频来产生532nm波长激光,二者再通过对Ⅱ类相位匹配LBO晶体进行和频来获得355nm紫外激光输出。355nm全固态紫外激光器在声光调Q重复频率为2.8kHz下,当输入电流为18A时可得到503mW的激光输出。     

利用复合Nd:YAG实现600 mW高效紧凑型蓝光激光器

报道了采用复合Nd: YAG晶体, LBO腔内倍频, 简单的平凹谐振腔结构实现大功率LDA泵浦条件下高效率蓝光激光器. 利用大功率泵浦情况下晶体的热透镜效应实现最优模式匹配, 在可吸收泵浦功率为15.09W时, 激光器的473nm蓝光功率输出达600mW, 光-光转化效率达3.98%.     

LD泵浦Nd∶YAG/LBO蓝光激光器的低噪声运转

观察了LD泵浦Nd∶YAG晶体,I类临界相位匹配LBO晶体腔内倍频的473 nm蓝光激光器的噪声特性,指出蓝光噪声主要来自于不同纵模的相互耦合,并用双折射滤光片技术实现了全固态蓝光激光器的低噪声稳定运转.在1.3W的泵浦功率下,获得了58mW的蓝光低噪声稳定输出.     

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     

高峰值功率KDP晶体四倍频266nm紫外激光器

报道了一种灯泵浦结构的Nd:YAG晶体电光调Q高峰值功率266nm紫外激光器。结合磷酸二氢钾(KDP)晶体性质,基于倍频理论,分析了考虑走离效应情况下存在相位失配量时KDP晶体长度对转换效率的影响。该激光器采用紧凑的平平腔结构,灯泵浦Nd:YAG晶体电光调Q 1064nm激光作为基频光,腔外采用Ⅱ类匹配磷酸钛氧钾(KTP)和Ⅰ类匹配KDP分别作为二倍频和四倍频晶体。利用能量计、示波器等仪器进行测量,激光器重复频率1Hz时,获得脉宽6.0ns,单脉冲能量35mJ的266nm紫外激光输出,峰值功率高达5.83 MW;当重复频率10Hz时,获得单脉冲能量28.9mJ的266nm紫外激光。532~266nm转换效率最高可达31.9%。利用该高峰值功率、窄脉宽266nm紫外激光器,能够实现激光打标、激光雕刻。     

二极管泵浦内腔倍频抑制绿光噪声的实验研究

 报道了在Nd:YAG棒和腔镜间插入四分之一波片，或在KTP倍频晶体和腔镜间插入四分之一波片，以及使用交叉双倍频晶体用以抑制二极管泵浦内腔倍频Nd:YAG激光器绿光噪声的实验结果。实验研究表明，使用上述三种方法之一能有效地减小折叠腔内的绿光噪声。用交叉倍频晶体可使噪声减小18％～25%。实验结果与理论一致，对实验中一些问题和值得进一步改进的地方也进行了讨论。     

Generation of 2.1 W Continuous Wave Blue Light by Intracavity Doubling of a Diode-End-Pumped Nd：YAG Laser in a 30 mm LBO

A folded four-mirror cavity with a composite Nd：YAG rod is optimized to obtain high efficient cw 473nm blue output. The laser could operate stably in the region of the thermal-lens focal length from 20mm to 70mm. LBO is used for intracavity frequency doubling of the 946nm transition of Nd：YAG and the optimum LBO length is investigated. A maximum output power of 2.1 Win the blue spectral range at 473nm is achieved with 30-mm-long LBO, corresponding to an optical conversion efficiency of 9.1%.     

Continuous wave Nd:YAG-BiBO blue laser under direct 869 nm pumping

We report a blue laser at 473 nm generation by intracavity frequency doubling of a continuous wave (CW) laser operation of a 946 nm Nd:YAG laser under in-band diode pumping at 869 nm. An BiBO crystal, cut for critical type I phase matching at room temperature is used for second harmonic generation of the laser. At an incident pump power of 8.6 W, as high as 721 mW of CW output power at 473 nm is achieved. The optical-to-optical conversion efficiency is up to 8.4%, and the fluctuation of the blue output power was better than 3.5% in the given 30 min.     

Efficient blue laser generation at 473 nm by a BIBO crystal

It is reported that efficient blue laser generation at 473 nm in a BIBO crystal at type-I phase matching direction of (θ,)=(18.3°,90°) performed with a diode-pumped Nd:YAG laser. With incident pump power of 1.6 W, output power of 183 mW at 473 nm has been obtained using a 5.0 mm-long BIBO crystal. The optical conversion efficiency was up to 11.4%. It was found that the intracavity frequency doubling efficiency is about 50% greater than that obtained with a 10 mm-long type-I phase-matching LBO crystal.     

2.41 W compact efficient CW blue light generation by intra-cavity frequency doubling of a compact Nd:YAG laser

We report on a laser diode end-pumped Nd:YAG blue laser using a three-mirror-folded cavity. Three different crystals cut for type-I critical phase matching are used for the intra-cavity frequency doubling of the laser: 10-mm-long LiB₃O₅ (LBO), 15-mm-long LBO, and 10-mm-long BiB₃O₆ (BIBO). Up to 2.41 W of continuous wave output power in the blue spectral range at 473 nm is achieved with BIBO crystal (1.89 W with LBO) at the incident pump power of 16 W, the light-to-light conversion efficiency is about 15.1%.     

Intracavity-frequency-doubling of a 946 nm Nd:YAG laser with cadmium mercury thiocyanate crystal

We report the intracavity-frequency-doubling of a 946 nm Nd:YAG laser with a CMTC crystal at room temperature. A cw output power of 1.64 mW of blue light at 473 nm is obtained. To our knowledge, this is the first time that CMTC crystal has been used to frequency double a 946 nm Nd:YAG laser.     

Continuous-wave, 15.2 W diode-end-pumped Nd:YAG laser operating at 946 nm

A high-power continuous-wave (cw) Nd:YAG laser operating at 946 nm by utilizing a quasi-three-level transition is reported. The laser consists of a composite Nd:YAG rod end pumped by a fiber-coupled diode laser and a simple plane-concave cavity. At an incident pump power of 40.2 W, a maximum cw output of 15.2 W at 946 nm is obtained, achieving a slope efficiency of 45%. To the best of our knowledge, this is the highest output at 946 nm ever generated by diode-pumped Nd:YAG lasers. In addition, at an incident pump power of 15.2 W, a 1.25 W blue output at 473 nm is achieved with a simple compact three-element cavity and a type-I lithium triborate (LiB(3)O(5)) crystal as a frequency doubler.     

Efficient, multiwatt, continuous-wave laser operation on the (4)F((3/2))-(4)I((9/2)) transitions of Nd:YVO(4) and Nd:YAG

We report multiwatt, diode-pumped cw operation on the (4)F(3/2)-(4)I(9/2) laser transition at 914.5 nm in Nd:YVO(4), for which an output power of 3.0 W and a slope of efficiency of 22.8% were achieved. For the corresponding laser transition of Nd:YAG at 946 nm an output power of 5.35 W and a slope efficiency of 40.2% were measured. By intracavity frequency doubling, an output power of 1.5 W at 473 nm was generated.     

Efficient generation of blue light by intracavity frequency doubling of a cw Nd:YAG laser with LBO

We report on the efficient room-temperature operation of ⁴F_3/2–⁴I_9/2 transition in a diode pumped Nd:YAG laser operating at 946 nm. An output power of 5.1 W and a slope efficiency of 23.6% at 946 nm have been obtained. Different LBO crystals of length 3×3×10 mm³, 3×3×15 mm³, 3×3×18 mm³ were selected as frequency doubling material for comparison. A maximum single-ended output power of 1.3 W at 473 nm was achieved by frequency doubling with an optical conversion efficiency of 5%. When the Nd:YAG rod was replaced by the one with high reflectivity coating at 473 nm on the pump side, the output power of blue light was almost twice that without high reflectivity coating for 473 nm at the same pump power level. Moreover, the theoretical optimum length of LBO crystal for intracavity frequency doubling was discussed, and the experimental results made a good agreement with it.     

All-solid-state continuous-wave frequency-doubled Nd:YAG-BiBO laser with 2.8-W output power at 473 nm

We report on a diode-pumped Nd:YAG laser with 4.6 W of linear polarized continuous-wave (cw) output power on the 4F3/2 --> 4I9/2 transitions at 946 nm. Three different crystals, cut for critical type I phase matching at room temperature, are used for the intracavity frequency doubling of the laser: 10-mm-long LiBaO5 (LBO), an 8-mm-long beta-BaB2O4 (BBO), and a 10.4-mm-long BiB3O6 (BiBO) grown by FEE GmbH. Up to 2.8 W of cw output power in the blue spectral range at 473 nm has been achieved with the BiBO crystal (2.1 W with BBO and 1.5 W with LBO).