2 μm Raman laser based on CO2-filled hollow-core silica fiber

Yazhou Wang; Olav T. S. Schiess; Rodrigo A. Correa; Christos Markos

doi:10.1117/12.2624183

25 May 2022 2 μm Raman laser based on CO₂-filled hollow-core silica fiber

Yazhou Wang, Olav T. S. Schiess, Rodrigo A. Correa, Christos Markos

Proceedings Volume 12142, Fiber Lasers and Glass Photonics: Materials through Applications III; 121420O (2022) https://doi.org/10.1117/12.2624183
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Here, we present a high pulse energy Raman laser at 1946 nm wavelength pumped with a 1533 nm linearly polarized fiber laser, with ∼92 μJ pulse energy, ∼60 pm linewidth, 8 kHz repetition rate, and 7 ns pulse duration. The Raman laser is based on the stimulated Raman scattering (SRS) effect in an 8-meter carbon dioxide (CO2) filled nested anti-resonant hollow-core fiber (ARHCF). The nested structure contributes to the significant reduction of the fiber loss caused by light leakage, surface scattering and bend, therefore allowing coiling the gas-filled ARHCF with a relatively small bend radius of just ~5 cm. When the pressure in the CO2-filled ARHCF increases from 1 to 17 bar, the pulse energy first reaches the maximum pulse energy level of 16.3 μJ (corresponding to 28 % quantum efficiency) at only 1.2 bar, and then rapidly decreases due to the pressure-dependent overlap of the Raman laser line with the absorption band of CO₂ at 2 μm spectral range. The relative intensity noise (RIN) of the Raman laser reaches a minimum level (4%) when the pulse energy exceeds ∼8 µJ. Due to the low amount of heat release during the SRS process, the laser has a good long-term stability without significant drift. Our results constitute a novel and promising technology towards high-energy 2 μm lasers.

Conference Presentation

Citation Download Citation

Yazhou Wang, Olav T. S. Schiess, Rodrigo A. Correa, and Christos Markos "2 μm Raman laser based on CO₂-filled hollow-core silica fiber", Proc. SPIE 12142, Fiber Lasers and Glass Photonics: Materials through Applications III, 121420O (25 May 2022); https://doi.org/10.1117/12.2624183

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