Abstract
Diamond has a broad spectral transmission range (>0.2 μm) and the largest Raman frequency shift (1,332 cm−1) among known Raman crystals. Hence, the diamond Raman laser has the potential to achieve lasing in the long-wave infrared (LWIR) range, which is difficult to reach via other crystalline lasers. Here, we report a new approach to achieve LWIR output using diamond Raman conversion and provide the corresponding analysis model and simulation results. The conversion efficiency is analyzed as function of the pump waist size, output-coupler transmission, and crystal length, at constant pump power. The maximum output power at which a diamond of relatively large size can be operated without damage is predicted. This study paves a way for high-power LWIR lasing in diamond.
Highlights
We propose a model of a first-order Raman laser with 10 μm output by utilizing diamond Raman conversion
We proposed a new scheme to realize long-wave infrared (LWIR) lasing output through diamond Raman conversion by utilizing the excellent photothermal properties of diamond crystals and the advantages of stimulated Raman scattering (SRS)
Using the diamond Raman steady-state model, we simulated the relationship between the output transmittance and the maximum conversion efficiency, Raman generation threshold, and residual pump power
Summary
Restricted by Raman gain coefficient, crystal length, intracavity diffraction loss, as well as resonator structure, Stokes beam cannot oscillate and output in a very short time, which leads to an obvious pulse compression effect during Raman conversion [21, 22]. When reaches the Stokes generation threshold, Stokes pulse is amplified rapidly with pump pulse depleted until the end of the pump cycle Compared with short pulse pumping (∼ns), increasing the pump pulse width in a certain range is an alternative way to improve the pump efficiency of LWIR-DRLs
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