Efficient Raman pulse fiber laser pumped by a dissipative soliton resonance pulse near 2 µm.
Opt Express
; 31(4): 6741-6749, 2023 Feb 13.
Article
em En
| MEDLINE
| ID: mdl-36823924
ABSTRACT
A high-efficiency Raman conversion from 1.987â
µm to 2.177â
µm is demonstrated experimentally in 45 m GeO2-doped silica fiber, adopting a dissipative soliton resonance (DSR) rectangular pulse as the pump. Over the entire spectral distribution, the spectral purity of the first-order Raman pulse is up to 96.8%, suggesting a nearly complete pump depletion before the onset of cascaded Raman shifts. The corresponding pump-to-Raman conversion efficiency of 67.4% is the highest up to date in this spectral region. Meanwhile, a large Raman pulse energy of 1.03 µJ was obtained at the repetition rate near MHz level, corresponding to 0.893 W average power. In the total output, the Raman-dominated spike has a Full Width Half Maximum (FWHM) of 1.18â
ns far narrower than DSR's pulse duration of 10.25â
ns. The results indicate that DSR is a promising candidate for developing efficient Raman nanosecond pulse fiber laser in mid-infrared (MIR) region.
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MEDLINE
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En
Ano de publicação:
2023
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Article