High-efficiency Tm-doped yttrium aluminum garnet laser pumped with a wavelength-locked laser diode

Abstract

We first demonstrate a high-efficiency composite Tm-doped yttrium aluminum garnet laser end-pumped with a narrow-linewidth laser diode, which was locked at a wavelength of 784.9 nm with volume Bragg gratings. The locked pump wavelength was experimentally determined by the excitation peak, which was also the absorption peak of a 3.5 at.% Tm:YAG crystal around 785 nm, for the improvement of laser efficiency under high-intensity pumping. Under an absorbed pump power of 24.64 W, a maximum output power of 11.12 W at 2018 nm was obtained, corresponding to an optical to optical conversion efficiency of 45.1% and a slope efficiency of 52.4%.

Fractal Characterization of Particle Size and Coordinate Distribution of Dispersed Phase in the Steelmaking Process of Combined Blowing Conversion

“…The optimal threshold of the image is determined by using the minimum error method [10][11][12][13][14][15][16]. Due to the fact that the digital images of dispersed phase contain two types of brightness regions-continuous phase (background) and dispersed phase (object)their grayscale histograms can be represented by the brightness density functions p 1 (x) and p 2 (x), which are the sum or weighted sum of two unimodal density functions (one corresponds to the bright region and the other one peak corresponds to the dark region).…”

Design and performance of a composite Tm:YAG laser pumped by VBG-stabilized narrow-band laser diode

“…6. The laser system was similar to that developed by Huang et al [19] The cavity parameters were specifically designed for thermal stability based on the ABCD matrix simulation. [20] M1 was the 45 • dichroic mirror that had a high transmission at 785 nm and high reflectivity at 2 µm.…”

Ho:YAG laser at 2097 nm pumped by a narrow linewidth tunable 1.91 μm laser

“…Using a narrow linewidth pump source is an effective way to increase the target laser efficiency 8 , 9 . The central wavelength and linewidth of a pump laser have a great influence on the Ho:YAG laser due to the narrow absorption wavelength peak of Ho:YAG crystal at 1.9 μm.…”

“…Pumping the Ho:YAG laser with a Tm-doped fiber laser is a more compact approach due to qualities such as simpler thermal management, higher conversion efficiency, and smaller volume. An output power of 36 W for the Ho:YAG laser pumped at 1907 nm by Tm-doped fibre laser has been reported by Antipov et al 7 .Using a narrow linewidth pump source is an effective way to increase the target laser efficiency 8,9 . The central wavelength and linewidth of a pump laser have a great influence on the Ho:YAG laser due to the narrow absorption wavelength peak of Ho:YAG crystal at 1.9 μm.…”