Laser emission from low-loss cladding waveguides in Pr:YLF by femtosecond laser helical inscription

• DOI: 10.3788/col202220.122201
• Publication Date: 2022-08-31T06:54:12Z
• Authors: Yingying Ren; Zemeng Cui; Lifei Sun; Chao Wang; Hongliang Liu; Yangjian Cai
• Keywords: Cladding (metalworking); Waveguide; Slope efficiency

Depressed cladding waveguides are fabricated in Pr:LiYF4 (YLF) crystal by femtosecond laser inscription following a helical scheme. With the optimized parameters, propagation loss of waveguide is around 0.12 dB/cm for multimode guiding. Under optical pumping with InGaN diodes at 444 nm, efficient lasers orange 604 nm (π-polarized) achieved minimum lasing threshold 119.8 mW, maximum slope efficiency 16.6%, and output power 120.6 mW. Benefiting from their performances, produced this work promising applications as compact sources.