1 清华大学精密仪器系光子测控技术教育部重点实验室，北京 100084
2 密尔医疗科技（深圳）有限公司，广东 深圳 518000
3 福建医科大学附属三明第一医院，福建 福州 365000
4 莱凯医疗器械（北京）有限公司，北京 101300
激光自诞生以来就在众多领域中有着广泛应用，激光碎石技术就是其中之一。相比目前激光碎石技术的“金标准”钬激光器，掺铥碎石光纤激光器在近些年不断发展，而且逐步被证明可实现更快的碎石速率与粉末化碎石、产生较小的碎石反推力、允许更高的液体灌溉速率等手术优点，同时整机系统支持免水冷工作、高电光效率运转、全光纤高效耦合以及大幅度体积缩减，因此受到了越来越多的关注。本文从连续性、准连续型和纳秒短脉冲型掺铥光纤激光器三个角度出发，详细总结了掺铥光纤激光器的部分重要研究进展及其在碎石领域的研究，介绍了掺铥光纤激光器用于碎石的优势与原理，并展望了未来研究的方向和挑战。
激光器 掺铥光纤激光器 掺铥连续光纤激光器 掺铥准连续光纤激光器 掺铥纳秒短脉冲激光器 掺铥激光碎石 激光与光电子学进展
2023, 60(15): 1500007
Author Affiliations
Abstract
1 School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
2 Han’s Laser Technology Industry Group Co., Ltd., Shenzhen 518055, China
3 Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China
The ultimate capacity of a cladding-pumped 10/130 Tm:fiber is experimentally investigated with a 793 nm laser diode bidirectionally pumped amplifier. The laser system works stably at the output powers of 52 W, 65 W, and 87 W. Eventually, the damage of the amplifier occurs when the output power reaches about 103.5 W with a total incident pump power of 176.8 W. Considering the incident seed power of 12.3 W, the amplifier conversion efficiency is estimated to be about 51.6% before it is damaged. With valuable exploration, we achieve the first air-cooling 60 W Tm:fiber laser at 1945.845 nm with a spectral linewidth of 0.4 nm. The laser power stability reaches 1.24% during a continuous test time of >65 h. The beam quality is measured as and .
double cladding Tm:fiber all-fiber laser Chinese Optics Letters
2020, 18(5): 051404
Author Affiliations
Abstract
1 Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing 100084, China
2 State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
3 School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
4 National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
The generation of mid-infrared pulsed lasers was achieved in a Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser system with the shortest pulse duration of 4.15 ns. With a pump pulse duration of 50 ns and pump power of 2.7 W, the gain-switched Cr2+:CdSe laser achieved over 10 times pulse narrowing, obtaining the maximum peak power of 5.7 kW. The optical-to-optical conversion efficiency was 3.7%, which could be further improved with better crystal surface polishing quality. The laser central wavelength was measured to be 2.65 μm with a bandwidth (FWHM) of 50 nm. In addition, the parameter optimization for suppressing the pulse tail was discussed, while the long cavity and high output transmissivity contributed to obtaining the single-peak pulses.
Cr2+:CdSe laser gain-switching pulse narrowing mid-infrared Chinese Optics Letters
2020, 18(3): 031403
1 深圳大学应用技术学院, 广东 深圳 518000
2 深圳技术大学中德智能制造学院数字化口腔激光智能制造重点实验室, 广东 深圳 518118
3 大族激光科技产业集团股份有限公司光源事业部, 广东 深圳 518000
使用5 W红外飞秒激光器对牙科全瓷修复中常用的玻璃陶瓷材料VITA MARK II进行铣削加工实验,系统研究超快激光加工工艺参数对铣削效率以及铣削效果的影响,并利用5 W红外飞秒激光器实验结果对20 W红外飞秒激光器铣削效率进行模拟预估。实验结果表明,在激光重复频率为100 kHz,扫描速度为200 mm/s,扫描间距为0.01 mm的条件下,5 W红外飞秒激光器对VITA MARK II陶瓷的铣削效率最高,为0.0409 mm 3/s。加工后的VITA MARK II陶瓷粗糙度为3~5 μm,崩边量在50 μm以内,斜坡量在100 μm以内。该牙科玻璃陶瓷的激光切割阈值约为0.72 J/cm 2。推算出20 W红外飞秒激光器对VITA MARK II陶瓷的铣削效率为0.1558 mm 3/s。上述实验论证了5 W激光切割牙科玻璃陶瓷的可行性及有效性,可为20 W红外飞秒激光铣削实验样机的搭建提供参考。
激光器 超快激光 牙科玻璃陶瓷 激光工艺参数 铣削效率 铣削效果 激光与光电子学进展
2020, 57(5): 051402
Author Affiliations
Abstract
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
A high pulse repetition frequency (PRF), high energy Ho:YAG laser directly pumped by a Tm-doped fiber laser and its application to a mid-infrared ZnGeP2 (ZGP) optical parametric oscillator (OPO) is demonstrated. The maximum polarized 2.09 μm laser pulse energy is 13.46 mJ at a PRF of 1 kHz. The corresponding peak power reaches 504 kW. In a double-resonant ZGP-OPO, a maximum mid-infrared laser pulse energy of 1.25 mJ, corresponding to a peak power of 79 kW, is accomplished at a PRF of 3 kHz. The nonlinear conversion efficiency reaches 41.7%. The nonlinear slope efficiency reaches 53.3%.
140.3070 Infrared and far-infrared lasers 140.3540 Lasers, Q-switched 140.4480 Optical amplifiers 140.5680 Rare earth and transition metal solid-state lasers Chinese Optics Letters
2017, 15(9): 091402
Author Affiliations
Abstract
Department of Precision Instrument, State Key Laboratory of Precision Measurement Technology and Instruments, Center for Photonics and Electronics, Tsinghua University, Beijing 100084, China
A high-power, high-energy Ho:YAG oscillator resonantly pumped by a Tm-doped fiber laser is presented. A maximum continuous output power of 38 W with a slope efficiency of 51.9% is achieved at the wavelength of 2.09 μm, and M2≈1.48. In the Q-switching regime, the maximum pulse energy of 12.8 mJ, corresponding to a 514.5 kW peak power, is obtained at the pulse repetition frequency of 1 kHz. Furthermore, the thermal lens effect of the system is studied theoretically, and the radius of the transverse electromagnetic (TEM00) mode of the laser crystal under different pump powers is given.
140.3540 Lasers, Q-switched 140.3580 Lasers, solid-state 140.5680 Rare earth and transition metal solid-state lasers Chinese Optics Letters
2015, 13(12): 121402
