2004•Journal of Northwest UniversityRequires access

LBO nonlinear optical crystal phase matched high power green laser

Long Li, Yuqing Hou

Abstract

Aim Nonlinear optical crystal lithium triborate (LBO)′s doubling frequency characteristic and all kinds of factor which would influence second harmonic generation (SHG) conversion efficiency are theoretically analysed and experimentallg researched.Methods The coupled-wave equation and nonlinear optical crystal doubling frequency phase-match condition.Results In the diode laser double-ends pumped Nd∶YVO_4 intracavity double frequency CW green laser experiments, two LBO crystals with difference double frequency peculiarity are researched. With I-type phase matching angles for angle tuning LBO, at 28.9W pump power, a maximum TEM_(00) of 4.2W continuous-wave output has been obtained, the optical-optical conversion efficiency is 18%; With I-type noncritical-phase-match LBO, at 28.9W pump power, a maximum of 8W continuous-wave output has been obtained, the optical-optical conversion efficiency is 31%. Conclusion Through LBO crystal′s SHG theoretical analysis and experimental research, high output power and high conversion efficiency are obtained in the Nd∶YVO_4/LBO laser system.

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Key concepts: Lithium triborate, Energy conversion efficiency, Laser, Materials science, Continuous wave, Second-harmonic generation, Optics, Crystal (programming language)