High Power Laser Science and Engineering, Vol. 8, Issue 4, 04000e35 (2020)
A Yb:KGW dual-crystal regenerative amplifier
Huijun He1,2, Jun Yu1, Wentao Zhu1, Xiaoyang Guo1,*, Cangtao Zhou1,*, and Shuangchen Ruan1,2,*
- 1Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen518118, China
- 2College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen518060, China
This study develops a Yb:KGW dual-crystal based regenerative amplifier. The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration. Sub-nanojoule pulses are amplified to 1.5 mJ with 9 nm spectral bandwidth and 1 kHz repetition rate using chirped pulse amplification technology. Consequently, 1.2 mJ pulses with a pulse duration of 227 fs are obtained after compression. Thanks to the cavity design, the output laser was a near diffraction limited beam with M2 around 1.1. The amplifier has the potential to boost energy above 2 mJ after compression and act as a front end for a future kilohertz terawatt-class diode-pumped Yb:KGW laser system.
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