AI Article Synopsis
- Researchers developed a highly efficient all-silica-fiber 2nd-order cascaded Raman pulse laser using 2-µm dissipative-soliton-resonance rectangular pulses and GeO-doped silica fiber for Raman gain.
- The laser achieved impressive conversion efficiencies with 1st-order Raman optical conversion reaching 64.4% at 2153 nm and 2nd-order at 19.3% at 2370 nm, marking the highest levels reported for such lasers.
- The system allows for tunability of the 2nd-order Raman light over a 41 nm range by adjusting the central wavelength of the seed pulse, offering a practical solution for mid-infrared applications.
Article 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 GeO-doped silica fiber as Raman gain medium. When pumped at 1966.5 nm, the maximum 1st-order Raman optical conversion efficiency is up to 64.4% at 2153 nm, with 92.4% spectral purity and 0.39-W average power. The maximum 2nd-order Raman optical conversion efficiency is 19.3% at 2370 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 41 nm (2354∼2395 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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| http://dx.doi.org/10.1364/OE.519310 | DOI Listing |
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