Journal
OPTICAL MATERIALS
Volume 126, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2022.112121
Keywords
Ultrafast laser inscription; Waveguides; Solid-state lasers; Waveguide lasers; Thulium lasers
Categories
Funding
- Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [118F058]
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This study reports the first waveguide laser operation of Tm3+:BaY2F8 crystal near the wavelength of 2 μm. Two waveguides were fabricated using femtosecond laser inscription, and lasing experiments were performed in the waveguides. Results showed that Tm3+:BaY2F8 crystal holds significant potential in the development of compact, efficient, femtosecond laser written waveguide lasers near 2 μm.
To our knowledge, we report the first waveguide laser operation of Tm3+:BaY2F8 crystal near the wavelength of 2 mu m. Femtosecond laser inscription was employed to fabricate two waveguides, each in the form of a circular depressed cladding, with diameters of 30 mu m and 50 mu m. For the 50-mu m-diameter waveguide, the propagation loss was determined as 0.22 dB/cm at the wavelength of 731 nm. A two-mirror resonator consisting of a buttcoupled input high reflector and a 10-cm-radius curved output coupler housed the Tm3+:BaY2F8 crystal waveguide during lasing experiments. By using a continuous-wave Ti3+:sapphire laser at 781 nm, waveguide lasing was obtained at 1.86 mu m. By using a 6% output coupler, as high as 73 mW of output power was obtained with the 50-mu m-diameter waveguide at an incident pump power of 680 mW, corresponding to a slope efficiency of 13.1%. Lasing threshold pump powers as low as 23 mW were further achieved with a 2% output coupler by using the 30-mu m-diameter waveguide. These results show that the Tm3+:BaY2F8 crystal possesses an important potential in the development of compact, efficient, femtosecond laser written waveguide lasers near 2 mu m.
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