1 西安文理学院 机械与材料工程学院，西安
2 西安电子科技大学 光电工程学院，西安
3 中国科学院物理研究所北京凝聚态物理国家实验室，北京
介绍了一款465 nm蓝光激光二极管泵浦的自启动皮秒钛宝石激光器。该激光器采用双侧泵浦结构，弥补了模式匹配的不足，充分利用了低掺杂浓度、长通光长度的钛宝石晶体，当泵浦功率为7 W时，获得了718 mW的连续光输出，且未观测到明显的泵浦诱导损耗现象。在SESAM的辅助下，获得371 mW、6 ps的可自启动的被动锁模输出，而且10 h内输出功率的RMS值小于0.5%。
激光二极管 钛宝石 自启动 皮秒 被动锁模 laser diode Ti:sapphire self-starting picosecond passive mode-locking
1 山西大学光电研究所, 量子光学与光量子器件国家重点实验室 山西 太原 030006
2 山西大学, 极端光学协同创新中心 山西 太原 030006
全固态连续单频455 nm 蓝色激光与铯原子高能态跃迁吸收线62S1/272P3/2相匹配, 是发展远距离水下量子通讯的重要光源。且455 nm 激光还对应于钡离子138Ba2+的跃迁能级6S1/26P3/2, 应用于量子计算领域, 有利于减小量子计算及精密测量的系统误差。本文设计了内腔倍频式全固态高功率连续单频455 nm 蓝光钛宝石激光器, 优化了激光器谐振腔结构与激光振荡阈值, 采用准相位匹配的MgO:PPSLT晶体作为内腔倍频器, 当绿光泵浦功率为11.5 W 时, 获得了最高输出功率为427 mW 的单频455 nm 蓝色激光, 光光转换效率为3.7%, 蓝光光束质量M2因子优于1.18。
水下量子通讯 455 nm 蓝光钛宝石激光器 单频 underwater quantum communication 455 nm blue Ti:sapphire laser single frequency
Author Affiliations
Abstract
1 Laboratoire pour l’Utilisation des Lasers Intenses, CNRS, Ecole Polytechnique, 91128 Palaiseau, France
2 CEA-CESTA, F-33116 Le Barp, France
Emerging multi-PW-class lasers and their envisioned laser–plasma interaction applications in unprecedented intensity regimes set a very demanding frame for the precise understanding of the finest properties of these systems. In this work we present a synthesis of simulation studies on a series of less known or even completely disregarded spatiotemporal effects that could potentially impact greatly the performances of high-intensity lasers.
spatiotemporal coupling Ti:sapphire lasers ultra-intense lasers High Power Laser Science and Engineering
2022, 10(1): 010000e5
强激光与粒子束
2021, 33(11): 111008
Author Affiliations
Abstract
1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
2 Novanta Europe GmbH, Garching 85748, Germany
We report a long-term frequency-stabilized optical frequency comb at 530–1100 nm based on a turnkey Ti:sapphire mode-locked laser. With the help of a digital controller, turnkey operation is realized for the Ti:sapphire mode-locked laser. Under optimized design of the laser cavity, the laser can be mode-locked over a month, limited by the observation time. The combination of a fast piezo and a slow one inside the Ti:sapphire mode-locked laser allows us to adjust the cavity length with moderate bandwidth and tuning range, enabling robust locking of the repetition rate (fr) to a hydrogen maser. By combining a fast analog feedback to pump current and a slow digital feedback to an intracavity wedge and the pump power of the Ti:sapphire mode-locked laser, the carrier envelope offset frequency (fceo) of the comb is stabilized. We extend the continuous frequency-stabilized time of the Ti:sapphire optical frequency comb to five days. The residual jitters of fr and fceo are 0.08 mHz and 2.5 mHz at 1 s averaging time, respectively, satisfying many applications demanding accuracy and short operation time for optical frequency combs.
optical frequency comb Ti:sapphire mode-locked laser phase lock optical atomic clock Chinese Optics Letters
2021, 19(12): 121405
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
A novel tiled Ti:sapphire (Ti:S) amplifier was experimentally demonstrated with >1 J amplified chirped pulse output. Two Ti:S crystals having dimensions of 14 mm× 14 mm× 25 mm were tiled as the gain medium in a four-pass amplifier. Maximum output energy of 1.18 J was obtained with 2.75 J pump energy. The energy conversion efficiency of the tiled Ti:S amplifier was comparable with a single Ti:S amplifier. The laser pulse having the maximum peak power of 28 TW was obtained after the compressor. Moreover, the influence of the beam gap on the far field was discussed. This novel tiled Ti:S amplifier technique can provide a potential way for 100 PW or EW lasers in the future.
Ti:sapphire crystal tiled Ti:sapphire amplifier chirped pulse Chinese Optics Letters
2021, 19(1): 011401
1 中国科学院固体激光重点实验室，北京 100190
2 中国科学院大学，北京 100049
3 哈尔滨工业大学信息光电子研究所，山东 威海 264209
通过一种脉冲钛蓝宝石激光器抽运铷蒸汽激光器，研究了抽运铷蒸汽激光器的动力学特性。铷蒸汽泡在室温下充满70 kPa甲烷和6 atm氦气。激光器的平均输出功率为208 mW，从吸收的779.8 nm泵浦光到795 nm激光的转换效率为19%。该激光器的峰值功率为693 W，重复率为3 kHz, 脉冲宽度(FWHM)100 ns。实验表明，在高泵浦光强DPALs中，Rb-He-CH4混合物的再吸收将是一个重要的限制。可以推导出在418 K时(缓冲气体：70 kPa甲烷和6 atm氦气，室温)，泵浦源LDs的线宽为0.9 nm时，Rb-He-CH4系统的泵浦强度阈值大于200.6 kW/cm2。
碱金属激光器 铷 钛宝石泵浦激光器 alkali laser rubidium Ti-sapphire pump laser 红外与激光工程
2020, 49(S1): 20200114
山西大学光电研究所量子光学与光量子器件国家重点实验室, 山西 太原 030006
利用全固态单频绿光激光器作为抽运源抽运钛宝石晶体，采用六镜环形谐振腔结构。在谐振腔内插入I类临界相位匹配的LBO 晶体进行腔内倍频，TGG 晶体和宽带半波片(HWP)组成的光学单向器保证单频运转。加入三片厚度分别为1、2、4 mm 的双折射滤波片组合和一片0.25 mm 的控温标准具片作为调谐元件，实现了高功率单频可调谐461 nm 蓝光钛宝石激光器。在14 W 的抽运功率下，选取LBO 倍频晶体的最佳长度为7.3 mm 时，获得了最大功率为1.02 W 的单频可调谐蓝光输出，中心波长为460.86 nm，3 h 内其长期稳定性优于±1.3%，光束质量得到了明显的改善，其M2因子优于1.59，蓝光最大调谐范围为20 nm。
激光器 钛宝石激光器 高功率 阈值 腔内倍频
1 中国科学院理化技术研究所低温工程学重点实验室, 北京 100190
2 中国科学院大学, 北京 100049
热效应是制约固态激光器技术发展的主要障碍之一，也是激光器发展的主要瓶颈。针对一抽运功率为100 W的掺钛蓝宝石激光器设计制造了一套以液氮为冷却工质的低温恒温器，从结构上对恒温器进行了优化设计，用实验的方法验证了该恒温器的热力学性能，用ANSYS软件分析了钛蓝宝石晶体在所设计的热沉条件下的温度分布和应力分布。结果表明该恒温器结构能够满足激光器的要求，且相比于常温冷却，钛蓝宝石激光晶体在液氮温度下温度分布更均匀，热应力更小。
激光器 恒温器 液氮冷却 掺钛蓝宝石晶体 光学学报
2014, 34(s1): s114009
