Abstract
We report here an all-fiber structure tunable gas Raman laser based on deuterium-filled hollow-core photonic crystal fibers (HC-PCFs). An all-fiber gas cavity is fabricated by fusion splicing a 49 m high-pressure deuterium-filled HC-PCF with two solid-core single-mode fibers at both ends. When pumped with a pulsed fiber amplifier seeded by a tunable laser diode at 1.5 μm, Raman lasers ranging from 1643 nm to 1656 nm are generated. The maximum output power is ~1.2 W with a Raman conversion efficiency of ~45.6% inside the cavity. This work offers an alternative choice for all-fiber lasers operating at 1.6–1.7 μm band.
Highlights
Stimulated Raman scattering (SRS) of gas medium has received great attention since it was first reported [1]
We demonstrated a subwatt 1.65 μm fiber gas Raman lasers (FGRLs) based on D2 -filled hollow-core photonic crystal fibers (HC-PCFs) [16], and further improved its output power [17]
We have demonstrated a 1.65 μm all-fiber tunable FGRL based on the pure rotational
Summary
Stimulated Raman scattering (SRS) of gas medium has received great attention since it was first reported [1]. Due to the short reaction length and weak reaction intensity, gas Raman lasers based on the traditional gas cell usually require high pump power, and the corresponding conversion is always inefficient. The advent of the hollow-core fibers (HCFs) provides new opportunities for efficient gas SRS [2,3]. This kind of innovative gas cell based on HCFs can provide a much longer reaction distance, and the pump laser and gas molecules are confined in the micron-level air core, which enhances the reaction intensity greatly. Fiber gas Raman lasers (FGRLs) have drawn great attention with the fast development of the HCFs [4,5,6,7]
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