Study On The Deuterium Gas Raman Laser Based On Band-gap Hollow-Core Fibers

Gas Raman laser is a new laser light source with gas as gain medium,hollow-core fiber as interaction environment and light transmission medium.It is an effective means to expand laser wavelength and has attracted extensive attention in recent years.In this paper,the deuterium gas Raman laser based on band-gap hollow fiber is studied.The main study contents are as follows.1.Based on the classical electromagnetic theory,a theoretical model describing the steady-state stimulated Raman scattering(SRS)of deuterium gas in hollow core fiber is established.The characteristics of deuterium gas Raman lasers with single-pass structure and resonant-cavity structure are simulated and analyzed respectively,which provides theoretical guidance for experimental research.2.The experimental study of deuterium gas Raman laser with single-pass structure is carried out.A quasi all-fiber deuterium gas Raman laser is built,and its output characteristics under different pressure are studied.When the output wavelength of the pulse pump source is 1540 nm,the maximum 1645 nm first-order Raman laser output of～1.6 W is obtained.An all-fiber gas cavity of ～49 m is prepared.The experimental study of deuterium gas Raman laser with all-fiber structure is carried out for the first time.The first-order Raman power of ～1.2 w can be obtained when the maximum pump power is injected.3.The experimental study of deuterium gas Raman laser with resonant-cavity structure is carried out.The first deuterium gas Raman laser oscillator with all-fiber structure is built by using homemade fiber gratings.When pumped by pulse,the maximum first-order Raman power of ～1.3 W is obtained;When pumped by CW,the first-order Raman power of ～0.6 W is obtained.Based on the first-order Raman resonator,the experimental study of cascaded Raman laser is carried out.The second-order Raman laser output with maximum power of ～0.5 W is obtained when pumped by pulse.