北京理工大学光电学院光电成像技术与系统教育部重点实验室, 北京 100081
设计和研制了1645 nm Er∶YAG单频脉冲激光器系统,采用注入种子技术和对称泵浦的双Er∶YAG陶瓷结构,当脉冲重复频率为200 Hz时,获得了最大平均脉冲能量为22.75 mJ、脉冲宽度为223.1 ns的单频调Q脉冲激光输出,x和y方向上的光束质量因子分别为1.16和1.15,0.5 h内单频脉冲的中心频率稳定性为578 kHz,激光脉冲输出能量的不稳定性小于0.5%。
激光器 全固态激光器 注入锁定 大能量 单频 激光陶瓷
Author Affiliations
Abstract
1 School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
2 Key Laboratory of Information Technology, Ministry of Industry and Information Technology, Beijing Institute of Technology, Beijing 100081, China
We demonstrated a high-energy single-frequency erbium-doped yttrium aluminum garnet (Er:YAG) laser. With 1470 nm laser diodes (LDs) as pumping sources, single-frequency laser pulses with energy of 28.6 mJ, 21.6 mJ, and 15.0 mJ are obtained at pulse repetition frequency of 200 Hz, 300 Hz, and 500 Hz, respectively. As far as we know, this is the highest single-frequency pulse energy with the Er:YAG gain medium. With the ring cavity design, pulse duration is maintained at hundreds of nanoseconds. This high-energy single-frequency laser with hundreds of nanoseconds pulse duration is a prospective laser source for light detection and ranging applications.
Er:YAG injection-locking single-frequency high energy Chinese Optics Letters
2020, 18(3): 031401
Author Affiliations
Abstract
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
A novel 1 kHz single-frequency, Q-switched Er-doped yttrium aluminum garnet (Er:YAG) laser pumped by a 1470 nm laser diode is demonstrated. The 500 ns, 5.52 mJ single-frequency, diffraction-limited pulses are obtained by using a ‘ramp-fire’ injection-seeding technique and an optical feedback architecture. The full width at half-maximum of the pulse spectrum is measured to be 1.47 MHz by using the heterodyne technique. The beam quality M2 factors are measured to be 1.18 and 1.24 in the x and y directions, respectively.
140.3520 Lasers, injection-locked 140.3280 Laser amplifiers Chinese Optics Letters
2019, 17(3): 031402
利用掺铒钇铝石榴石(Er∶YAG)单块非平面环形腔(NPRO)激光器作为种子源,通过注入锁定技术研制了半导体抽运的Er∶YAG陶瓷单频脉冲激光器。在重复频率为200 Hz的条件下,获得了脉冲能量为11.45 mJ、脉冲宽度为174 ns的1645 nm单频脉冲输出,在x和y方向上的M2因子分别为1.45和1.42,脉冲光与种子光拍频信号的频谱半峰全宽为2.67 MHz。实验表明,Er∶YAG陶瓷作为增益介质在产生1.6 μm激光方面具有较好的性能。此激光器可在激光雷达领域作为多普勒相干测风激光雷达和遥感激光雷达的光源。
激光器 半导体抽运 注入锁定 全固态激光器
设计并研究了双晶四端泵浦的Tm:YLF激光器。利用Ansys 软件中的稳态热分析模块计算了散热底板水通道在热交换系数分别为1 000 W/(m2·℃)、4 000 W/(m2·℃)、8 000 W/(m2·℃) 和 15 000 W/(m2·℃)以及采用TEC制冷时对应的晶体夹具及散热底板的温度分布。根据计算结果, 在采用水温16℃中等强制对流及以上时与TEC制冷控温18~20℃时对Tm:YLF晶体冷却效果近似, 可近似等效于TEC制冷。根据模拟计算的结果, 设计了可用光纤耦合半导体激光器泵浦的U型腔结构Tm: YLF激光器。在采用16℃冷却水直接冷却晶体夹具时, 单晶双端泵浦和双晶四端泵浦的Tm: YLF输出功率分别达到了25.9 W和46 W的激光输出, 对应的斜效率分别为40.7%和37.1%。在实验过程中, 晶体夹具未出现温度过高。实验结果说明设计的直接传导冷却系统可有效地冷却泵浦功率在140 W时的双晶四端泵浦结构Tm:YLF晶体。
Tm:YLF激光器 Ansys稳态热分析 直接传导冷却 Tm:YLF laser Ansys steady-state thermal analysis directly conduction cooled 红外与激光工程
2017, 46(5): 0506001
1 西南技术物理研究所, 成都 610041
2 南京理工大学 电子工程与光电技术学院, 南京 210094
3 北京理工大学 光电学院, 北京 100081
为了研究高能激光外场特性, 研制了一套用于测量大口径高能量脉冲激光参量的测量装置。该装置包括一套自校准系统, 能够对其主要系数进行现场校准。采用理论分析和实验研究的方法, 对装置的测量原理、性能和结构进行了描述, 并对测量误差进行了理论分析, 证明了该装置能够同时测量高能激光光强分布和能量值, 最后采用校准实验的方法对测量误差进行了验证和分析。该装置对激光脉冲能量和光强分布的测量误差分别为4.5%和5%。结果表明, 该装置有较高的测量精度和可靠性, 能广泛用于大口径高能量脉冲激光外场测试。
测量与计量 高能激光 实验方法 成像 measurement and metrology high energy laser experimental method image
Author Affiliations
Abstract
A compact monolithic Nd:YAG non-planar ring laser with diffusion-bonded Cr4+:YAG is demonstrated, and high stable pulsed single-frequency laser at 1.06 \mu m is realized. Theoretical analysis and simulation results of pulsed laser parameters are illustrated. 14.96-kW maximum peak power, pulse-width of 4.8 ns is achieved for single-frequency operation.
140.3540 Lasers, Q-switched 140.3560 Lasers, ring 140.3570 Lasers, single-mode Chinese Optics Letters
2014, 12(2): 021404
根据高稳定性半导体激光(LD)泵浦单块非平面环形腔(NPRO)单频激光器对于功率稳定性和频率稳定性的要求, 设计并研制了一套高精度的精密温控系统。该系统基于模拟比例-积分-微分(PID)控制原理, 采用程控调节P和PI的方式, 通过对半导体制冷器(TEC)的驱动控制, 实现在-10~+70℃范围内对LD和NPRO单块晶体温度的精确控制, 控温精度达±0.01℃。采用该温控系统的LD泵浦1645nm NPRO单频激光器, 30min内相对波长稳定性达8.32×10-7。
单频激光器 精密温控 波长稳定性 single frequency lasers PID PID accurate temperature control wavelength stability
Author Affiliations
Abstract
An efficient 1 319-nm Nd:YAG single-frequency laser is demonstrated in a diffusion-bonded nonplanar ring oscillator (NPRO) with an undoped end. The thermal model of diffusion-bonded NPRO is generated to analyze the temperature field and thermal focal length. A stable single-frequency output power of up to 1.55 W is obtained at 1 319 nm.
140.3410 Laser resonators 140.3580 Lasers, solid-state 140.6810 Thermal effects Chinese Optics Letters
2013, 11(4): 041406
1 School of Opto-Electronics, Beijing Institute of Technology, Beijing 100081, China
2 Institute of Optics and Atomic Physics, Technical University Berlin, Berlin 10623, Germany
Frontiers of Optoelectronics
2012, 5(4): 400
