CC BY
11The 30th International Conference on Advanced Laser Technologies ALT'23
LS-I-5
Mid-infrared supercontinuum generation in hollow-core silica fibers
A.V. Gladyshev', D.S. Dubrovskii12, Yu.P. Yatsenko1, I.A. Bufetov1
1- Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, 38
Vavilov st., Moscow, Russia, 119991 2 - Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1, str.2, Moscow, Russia, 119991
Mid-infrared (mid-IR) supercontinuum (SC) sources are of great interest for many applications. Revolvertype hollow-core fibers (HCF) present an attractive platform to realize efficient fiber-based SC generation at wavelengths X > 2.4 ^m in the mid-IR. In practice, however, mid-IR SC in HCFs has been experimentally achieved only in a few works [1-3], all of which used noble gases and demonstrated limited efficiency. Recently, we have proposed and demonstrated SC generation in a revolver HCF filled by molecular deuterium [4,5], in which the SC spectrum has reached the wavelength of 3.3 ^m in the mid-IR due to cascaded stimulated Raman scattering (SRS) on deuterium molecules.
In this work, we investigate experimentally the way to extend the SC spectrum generated in a gas-filled revolver HCF further into the mid-IR. The revolver fiber was filled by a mixture of molecular hydrogen isotopes OH2 and D2) and pumped by chirped ultrashort pulses at the wavelength of 1.03 ^m. The transfer of pump energy into the mid-infrared range was initiated by cascade stimulated Raman scattering in the gas mixture, while Kerr nonlinearity was responsible for spectral broadening, thus giving rise to generation of a supercontinuum that covers the wavelength range of up to 4 ^m. The effect of Kerr nonlinearity was studied by controlling the amount of linear chirp introduced to the pump pulses. The influence of gas pressure and pump pulse energy on the supercontinuum generation was also investigated.
2000 3000 4000 5000
Wavelentgh (nm)
Fig. 1. Supercontinuum generation in the silica HCF that was filled by H2/D2 gas mixture and pumped by 82-^J 1-ps-long pulses at 1.03 ^m.
This work is supported by Russian Science Foundation (grant №19-12-00361).
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[2] M. Cassataro, D. Novoa, M.C. Gunendi et al., Generation of broadband mid-IR and UV light in gas-filled single-ring hollow-core PCF, Opt. Express, vol.25, pp.7637-7644 (2017).
[3] A.I. Adamu, M.S. Habib, C.R. Petersen et al., Deep-UV to Mid-IR Supercontinuum Generation driven by Mid-IR Ultrashort Pulses in a Gas-filled Hollow-core Fiber, Sci. Rep., vol.9, p.1 (2019).
[4] Yu.P. Yatsenko, A.V. Gladyshev, I.A. Bufetov, Mid-IR supercontinuum generation initiated by two-cascade stimulated Raman scattering in D2-filled revolver fibre, Quantum Electron., vol.51, pp.1068-1075 (2021).
[5] A. Gladyshev, Y. Yatsenko, A. Kolyadin, and I. Bufetov, Visible to Mid-Infrared Supercontinuum Initiated by Stimulated Raman Scattering of 1.03 ^m Ultrashort Pulses in a Gas-Filled Silica Fiber, Photonics, vol.9, p.997 (2022).
