Journal
CHINESE PHYSICS B
Volume 31, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1674-1056/abff46
Keywords
high-energy; picosecond; optical parametric frequency conversion
Categories
Funding
- National Science Foundation for Young Scientists of China [61805259]
- Youth Innovation Promotion Association, CAS
- Chinese Academy of Sciences [ZDRW-KT-2019-4-01]
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The study presents a new management of multi-stage optical parametric generator (OPG) and amplifier (OPA) to achieve high-energy picosecond sources with high beam quality. A proof-of-principle experiment demonstrated a single-pass multi-stage OPG-OPA setup with pump beam mode-matching, resulting in a picosecond laser operating at kilohertz regime.
We demonstrate a new management of multi-stage optical parametric generator (OPG) and amplifier (OPA) to obtain high-energy picosecond sources with high beam quality. The setup of multi-stage OPG-OPA requires mode-matching between the pump beam and the stable mode of the OPG-OPA. In a proof-of-principle experiment, the single-pass multi-stage OPG-OPA consists of three walk-off compensated KTP crystal pairs and two lenses, pumped by an 86 ps, 1064 nm 10 kHz picosecond laser. The signal light at similar to 1.77 mu m has an average output power of 502 mW with record energy up to 50.2 mu J. The beam quality factor of the signal light can be improved to M-x(2) x M-y(2) = 1.87 x 2.16 after filtering out about 40% signal power. To the best of our knowledge, it is the first picosecond single-pass multi-stage OPG-OPA pumped at kHz regime.
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