High pulse energy fiber/solid-slab hybrid picosecond pulse system for material processing on polycrystalline diamonds

Abstract

We demonstrate an all polarization-maintaining (PM) fiber mode-locked laser seeded, hybrid fiber/solid-slab picosecond pulse laser system which outputs 40 µJ, 10 ps pulses at the central wavelength of 1064 nm. The beam quality factors M 2 in the unstable and stable directions are 1.35 and 1.31, respectively. 15 µJ picosecond pulses at the central wavelength of 355 nm are generated through third harmonic generation (THG) by using two LiB 3 O 5 (LBO) crystals, in order to get better processing efficiency on polycrystalline diamonds. The high pulse energy and beam quality of these ultraviolet (UV) picosecond pulses are confirmed by latter experiments of material processing on polycrystalline diamonds. This scheme which combines the advantages of the all PM fiber mode-locked laser and the solid-slab amplifier enables compact, robust and chirped pulse amplification-free amplification with high power picosecond pulses.

Editorial: HPLSE special issue on fibres for high-power lasers

“…Monolithic high-average-power linearly polarized nanosecond pulsed fiber laser with near-diffractionlimited beam quality [3] 4. High pulse energy fiber/solid-slab hybrid picosecond pulse system for material processing on polycrystalline diamonds [4] 5. Nonlinearity optimization of dissipative-soliton fiber laser for generation of pulses with 350 kW peak power [5] 6.…”

“…To the best of our knowledge, this is the highest average output power of the all-fiberized narrow linewidth ns pulsed fiber laser with linear polarization and high beam quality, which is a promising source for the nonlinear frequency conversion, laser lidar, and so on. 4. High pulse energy fiber/solid-slab hybrid picosecond pulse system for material processing on polycrystalline diamonds Wei Chen (a1) , Bowen Liu (a1) , Youjian Song (a1) , Lu Chai (a1) , Qianjin Cui (a2) , Qingjing Liu (a2) , Chingyue Wang (a1) , and Minglie Hu (a1)…”

“…• Large mode area fibres for power scaling Submissions for this special issue cover from the development of active fibres itself to the advances in fibre lasers and fibre amplifiers. Papers described research on high-power ytterbium-doped fibre lasers and amplifiers operating in continuous wave [1,2] , nanosecond regime [3] , picosecond regime [4] and femtosecond regime [5] ; erbiumdoped tunable fibre amplifier [6] ; Raman fibre laser [7,8] and nonlinear amplifier [9] ; high harmonic generation for UV Correspondence to: Y. Wang, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China. Email: wangyingying@bjut.edu.cn wavelength [10] as well as a review of ytterbium-doped fibres [11] .…”

“…By building a hybrid fibre/solid-slab picosecond pulse laser system and utilizing third high harmonic generation (HHG) of LiB O (LBO) crystals, a picosecond laser at 355 nm is generated for material processing [4] . Efficient HHG at 149 nm is enabled by external seeded femtosecond enhancement cavity (fsEC) for time-resolved photoemission spectroscopy applications [10] .…”

“…Special issue content kW-class high power fiber laser enabled by active long tapered fiber [1] Numerical modeling of the thermally induced core laser leakage in high power co-pumped ytterbium doped fiber amplifier [2] Monolithic high-average-power linearly polarized nanosecond pulsed fiber laser with near-diffraction-limited beam quality [3] High pulse energy fiber/solid-slab hybrid picosecond pulse system for material processing on polycrystalline diamonds [4] Nonlinearity optimization of dissipative-soliton fiber laser for generation of pulses with 350 kW peak power [5] 10 watt-level tunable narrow linewidth all-fiber amplifier [6] Power scaling on tellurite glass Raman fibre lasers for mid-infrared applications [7] Investigation on extreme frequency shift in silica fiber-based high-power Raman fiber laser [8] Towards high power nonlinear fiber amplifier [9] Efficient high harmonics generation by enhancement cavity driven with a post-compressed FCPA laser at 10 MHz [10] Development and prospect of high-power doped fibers [11] …”