Development of tunable all solod-state UV laser

可调谐全固态紫外激光器的研制

• 批准号: 07555015
• 负责人: SASAKI Takatomo
• 金额: $ 6.66万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555015/
• 关键词: Tunable; UV laser; All solid-state; LBO; Intracavity; Frequency conversion; 波長変換; 紫外レーザー光; 全固体化; CsLiB_6O_<10>; LiB_3O_5; 第二高調波発生; チタンサファイアレーザー

・Simple and high-efficiency cw Ti : sapphire LBO-intracavity SHG cavity was successfully developed.・Infrared-to-UV conversion efficiency over 70% was realized. To the best of our knowledge, this is the highest SHG efficiency with cw Ti : sapphire laser ever reported.・Stable and wavelength-tunable UV radiation was obtained with the maximum power of 740 mW.Wavelength-tuning range was from 400 nm to 395 nm and is possibly extended by using different cut LBO crystals. The UV output pattern was close to circular and spatial-intensity distribution was smooth, and therefore suited for application. The issue of intracavity-SHG instability was overcome by large mode number pumping laser.・Enhancement factors of conversion efficiency were theoretically analyzed. Calculated UV powers were in good agreement with the measured ones.・In addition to LBO,BBO and CLBO crystals were utilized and compared. From the view points of conversion efficiency, output pattern and tuning characteristic, LBO crystal is realized to be most favorable for this application. However,・Laser-induced damages on LBO AR-coatings were observed as the laser operated at higher power level.

·成功研制出简单高效的连续波钛宝石LBO腔内倍频腔。实现了70%以上的紫外-可见光转换效率。据我们所知，这是迄今为止报道的连续钛宝石激光器的最高SHG效率。·获得了稳定的波长可调谐的紫外光辐射，最大功率为740 mW，波长调谐范围为400 ~ 395 nm，并可通过不同切割的LBO晶体进行扩展。紫外输出模式接近圆形，空间光强分布平滑，适合应用。大模数泵浦激光克服了腔内倍频不稳定性问题。从理论上分析了提高转换效率的因素。计算的UV功率与测量值非常一致。·除了LBO之外，还利用并比较了BBO和CLBO晶体。从转换效率、输出模式和调谐特性等方面考虑，LBO晶体是最适合这种应用的晶体。然而，随着激光功率的增加，LBO抗反射涂层上的激光诱导损伤被观察到。

项目成果

W.L.Zhou: "Intracavity Frequency Doubling of a cw Ti:sapphire Laser with Over 70% Conversion Efficiency" Appl.Phys.Lett.66. 2463-2465 (1995)

周文林:%20"腔内%20频率%20倍增%20of%20a%20cw%20Ti:蓝宝石%20激光%20with%20Over%2070%%20转换%20效率"%20Appl.Phys.Lett.66.%202463-2465%20

Yusuke Mori: "Intracarity tregnency donbling of a CW Ti:sapphire laser with over 70% ettlictency" Applied Physics Letters. 66. 2463-2465 (1995)

佑介%20森:%20"Intracarity%20tregnency%20donbling%20of%20a%20CW%20Ti:sapphire%20laser%20with%20over%2070%%20ettlictency"%20Applied%20Physics%20Letters.%2066.%202463-2465%20

W.-L.Zhou, Y.Mori, T.Sasaki, S.Nakai, K.Nakano, and S.Niikura: "High-Efficiency Intracavity Frequency Doubled CW and Tunable Ti : sapphire Laser" Jpn.J.Appl.Phys.Vol.34. 3518-3521 (1995)

W.-L.Zhou、Y.Mori、T.Sasaki、S.Nakai、K.Nakano 和 S.Niikura：“高效腔内倍频 CW 和可调谐钛：蓝宝石激光器” Jpn.J.Appl.Phys

W.L.Zhou: "Single-Longitudinal-MOde Operation and Lager Energy Diffusion due to Interacavity SHG in a Nd:YVO_4 Microchip Laser" Jpn.J.Appl.Phys.33. L779-782 (1994)

W.L.Zhou：“Nd:YVO_4 微芯片激光器中腔间倍频产生的单纵向模式操作和更大的能量扩散”Jpn.J.Appl.Phys.33。

Yusuke Mori: "Intracavity trequency doubling of a cw ti : sapphire laser with over 70% efficiency" Applied Physics Letters. 66. 2463-2465 (1995)

佑介%20森:%20"腔内%20trequency%20doubling%20of%20a%20cw%20ti%20:%20sapphire%20laser%20with%20over%2070%%20efficiency"%20Applied%20Physics%20Letters.%2066.%202463-