Publication:
Fabrication of femtosecond laser written depressed-cladding waveguides in Tm3+:BaY2F8 crystal and laser operation near 2 μm

Placeholder

Organizational Units

Program

KU Authors

Co-Authors

Tonelli, Mauro

Advisor

Publication Date

2022

Language

English

Type

Journal Article

Journal Title

Journal ISSN

Volume Title

Abstract

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.

Description

Source:

Optical Materials

Publisher:

Elsevier

Keywords:

Subject

Materials science, Optics

Citation

Endorsement

Review

Supplemented By

Referenced By

Copy Rights Note

0

Views

0

Downloads

View PlumX Details