The design optimization and experimental investigation of the 4420 nm Raman laser based on hydrogen-filled revolver silica fiber

TL;DR

This paper designs and experimentally tests a 4420 nm Raman laser using hydrogen-filled revolver silica fiber, optimizing fiber parameters for efficient frequency conversion and demonstrating high quantum efficiency and power output.

Contribution

It presents the first optimized design and experimental realization of a 4420 nm Raman laser based on hydrogen-filled revolver silica fiber, with detailed parameter analysis.

Findings

Quantum efficiency of 36% achieved

Output average power of 250 mW demonstrated

Optimal fiber design for 4420 nm Raman laser identified

Abstract

Optical properties of hollow-core revolver fibers are numerically investigated depending on various parameters: the hollow-core diameter, the capillary wall thickness, the values of the minimum gap between the capillaries, the number of capillaries in the cladding and the type of glass (silica and chalcogenide). Preliminary, similar calculations are made for simple models of hollow-core fibers. Based on the obtained results, the optimal design of the revolver fiber for Raman laser frequency conversion (1560 nm to 4420 nm in H2) was determined. As a result, efficient ns-pulsed 4420 nm Raman laser based on H2-filled revolver silica fiber is realized. Quantum efficiency as high as 36 % is achieved and output average power as high as 250 mW is demonstrated.