Abstract
Efficient continuous-wave laser emission of acetylene molecules at 3.1 μ m wavelength has been demonstrated in low-loss hollow-core fiber by optically pumping using a fiber-amplified diode laser around 1.53 μ m. In this paper, we report and compare the continuous-wave laser performance of acetylene molecules in the cavity and single-pass configurations. The use of low-loss antiresonant hollow-core fiber makes the single-pass configuration ideal for high-power laser generation and enables over 1.1 W continuous-wave mid-infrared laser output with over 33% slope efficiency relative to the absorbed pump power. The systematic characterization of power-scaling and pump power absorption properties demonstrates that the molecular kinetics inside hollow-core fiber determines the laser performance, and that low fiber attenuation is key to high-efficiency continuous-wave output.
Highlights
M ID-INFRARED fiber lasers with high output powers have developed rapidly in recent years thanks to the maturing fabrication of soft glass and soft-glass fiber, as well as the advanced fiber laser technologies proven in the development of near-infrared fiber lasers [1]–[3]
We review the studies of CW acetylene hollowcore fibers (HCFs) laser for 3 μm wavelength in both ring-cavity and single-pass configurations
We find that a ring cavity can offer the lowest laser threshold but that high efficiency at high pump powers is best achieved using a single-pass configuration
Summary
M ID-INFRARED fiber lasers with high output powers have developed rapidly in recent years thanks to the maturing fabrication of soft glass and soft-glass fiber, as well as the advanced fiber laser technologies proven in the development of near-infrared fiber lasers [1]–[3]. Novel gas-filled hollow-core fiber lasers [11] based on the use of low-loss hollowcore fibers (HCFs) formed from silica and transmitting into the mid-infrared are free of those limitations and have demonstrated potential for high-power mid-infrared laser emission [12], [13]. They provide an alternative route to developing versatile highpower mid-infrared fiber lasers
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