Ultraviolet to mid-infrared gas-filled anti-resonant hollow-core fiber lasers
We will present our recent work using noble and Raman-active gas-filled anti-resonant hollow-core fiber (ARHCF) technology. First, we will present the generation of supercontinuum spanning from 200 nm to 4000 nm based on nonlinear effects of soliton self-compression and phase-matched deep‑ultraviolet (DUV) dispersive wave (DW) emission in Argon (Ar)-filled ARHCFs pumped at 2.46 μm wavelength with 100 fs pulses and ~8μJ pulse energy. Then we will discuss our recent work on stimulated Raman scattering (SRS) effect in a hydrogen (H2)-filled ARHCF, to achieve near- and MIR Raman lasers. By employing the single-stage vibrational SRS effect, a 4.22 μm Raman laser line is directly converted from a linearly polarized 1.53 μm pump laser. A quantum efficiency as high as 74% was achieved, to yield 17.6 µJ pulse energy. The designed 4.22 μm wavelength is well overlapped with the strongest CO2 absorption, therefore constituting a promising way for CO2 detection. In addition, we report a multi-wavelength Raman laser based on the cascaded rotational SRS effect. Four Raman lines at 1683 nm, 1868 nm, 2100 nm, and 2400 nm are generated, with pulse energies as high as 18.25 µJ, 14.4 µJ, 14.1 µJ, and 8.2 µJ, respectively. The energy of these Raman lines can be controlled by tuning the H2 pressure from 1 bar to 20 bar.
Technical Univ. of Denmark (Denmark)
Yazhou Wang received the B.Sc. degree in physics from Southwest University, the M.Sc. degree in 3D displaying from Sichuan University, and Ph.D. degree in the nonlinear fiber optics from University of Electronic Science and Technology of China. During the Ph.D. period, he was a visiting student in the Technical University of Denmark in 2018, with the study on air plasma based THz generation. Upon received his Ph.D. degree in 2019, he joined Technical University of Denmark as a post-doc. Currently, his study focuses on infrared gas-filled fiber Raman laser design and applications in gas detection.
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