title: Cavity-enhanced frequency doubling from 795nm to 397.5nm ultra-violet coherent radiation with PPKTP crystals in the low pump power regime.
abstract: We demonstrate a simple, compact and cost-efficient diode laser pumped frequency doubling system at 795 nm in the low power regime. In two configurations, a bow-tie four-mirror ring enhancement cavity with a PPKTP crystal inside and a semi-monolithic PPKTP enhancement cavity, we obtain 397.5nm ultra-violet coherent radiation of 35mW and 47mW respectively with a mode-matched fundamental power of about 110mW, corresponding to a conversion efficiency of 32% and 41%. The low loss semi-monolithic cavity leads to the better results. The constructed ultra-violet coherent radiation has good power stability and beam quality, and the system has huge potential in quantum optics and cold atom physics.
authors.forename: Xin
authors.initials: X
authors.lastname: Wen
authors.forename: Yashuai
authors.initials: Y
authors.lastname: Han
authors.forename: Jiandong
authors.initials: J
authors.lastname: Bai
authors.forename: Jun
authors.initials: J
authors.lastname: He
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Wang
authors.forename: Baodong
authors.initials: B
authors.lastname: Yang
authors.forename: Junmin
authors.initials: J
authors.lastname: Wang
mesh_terms: D000669:Amplifiers, Electronic; D003460:Crystallization; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D053844:Lasers, Solid-State; D008027:Light; D010710:Phosphates / Q000737:chemistry* / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D010710:Phosphates; C064806:potassium titanylphosphate; D014025:Titanium