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

被引:0
作者
Wang, Yazhou [1 ]
Schiess, Olav T. S. [1 ]
Correa, Rodrigo A. [2 ]
Markos, Christos [1 ,3 ]
机构
[1] Tech Univ Denmark, DTU Foton, DK-2800 Lyngby, Denmark
[2] Univ Cent Florida, Coll Opt & Photon, CREOL, Orlando, FL 32816 USA
[3] NORBLIS IVS, Virumgade 35D, DK-2830 Virum, Denmark
来源
FIBER LASERS AND GLASS PHOTONICS: MATERIALS THROUGH APPLICATIONS III | 2022年 / 12142卷
关键词
Raman laser; stimulated Raman scattering; anti-resonant hollow-core fiber; carbon dioxide; HIGH-PULSE ENERGY; MU-M; GAS; DEPENDENCE; SCATTERING; Q(1);
D O I
10.1117/12.2624183
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Here, we present a high pulse energy Raman laser at 1946 nm wavelength pumped with a 1533 nm linearly polarized fiber laser, with similar to 92 mu J pulse energy, similar to 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 similar to 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 mu J (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 mu m spectral range. The relative intensity noise (RIN) of the Raman laser reaches a minimum level (4%) when the pulse energy exceeds similar to 8 mu J. 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 mu m lasers.
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页数:8
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