1881 nm Tm:YAG ceramic laser with a volume bragg grating as a cavity mirror

Abstract

We demonstrate a narrow linewidth 1881 nm Tm:YAG ceramic laser that combines the advantages of in-band pumping at 1617 nm and volume Bragg grating as a wavelength selection device. With an output coupler of 5% transmission, a maximum output power of 200 mW is obtained at 1881 nm with a linewidth of 0.2 nm. Fig. 1. Absorption (solid curve) and emission (dotted curve) spectra of 4 at.% Tm:YAG ceramic.

Comparative study of pulsed laser diode end-pumped thulium-doped 2-μm Q-switched lasers*

“…Therefore, high efficiency, high energy, wide wavelength tuning range, and good stability are the main development direction of 2-µm lasers. [3][4][5] The radiation of 2-µm wavelength is obtained practically by lasers based on the active media doped with thulium, holmium or a mixture of thulium and holmium together or by 1-µm lasers pumped OPOs or the Ho-lasers pumped by Tmlasers. However, the process of generating 2-µm laser by OPO is complicated, which is not conducive to the development of miniaturized and integrated laser light source.…”

Widely tunable, narrow linewidth Tm: YAG ceramic laser with a volume Bragg grating

“…As a kind of diffraction grating recorded in photo-thermalrefractive (PTR) glass, VBGs are characterized by high diffraction efficiency (>99%), low insertion loss, narrow spectral selectivity, high damage threshold, and good thermal stability [16,17] . Recently, VBGs have been successfully used as the wavelength selective elements in both fiber lasers and solid-state lasers [17][18][19][20] . In 2013, Long et al reported a single-frequency laser operation using a VBG as the wavelength selection element.…”