Efficient tunable cascaded Raman source with all-silica fibers based on 2-µm DSR pulse pumping.
Opt Express
; 32(7): 12992-13000, 2024 Mar 25.
Article
em En
| MEDLINE
| ID: mdl-38571105
ABSTRACT
We present an efficient tunable all-silica-fiber 2nd-order cascaded Raman pulse laser utilizing 2-µm dissipative-soliton-resonance (DSR) rectangular pulses for pumping and highly GeO2-doped silica fiber as Raman gain medium. When pumped at 1966.5â
nm, the maximum 1st-order Raman optical conversion efficiency is up to 64.4% at 2153â
nm, with 92.4% spectral purity and 0.39-W average power. The maximum 2nd-order Raman optical conversion efficiency is 19.3% at 2370â
nm, with 39.2% spectral purity and 0.25-W average power. To our knowledge, these conversion efficiencies and spectral purities represent the highest levels achieved in a mid-infrared all-silica-fiber cascaded pulsed Raman laser. Additionally, by adjusting the central wavelength of the DSR seed pulse, the 2nd-order Raman light can be tuned within a range of 41â
nm (2354â¼2395â
nm). Our system provides a simple and easy-to-implement solution for realizing efficient tunable cascaded pulsed Raman lasers in the 2.4-µm band.
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article