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1. (WO1998052260) INTRA-CAVITY AND INTER-CAVITY HARMONICS GENERATION IN HIGH POWER LASERS

Pub. No.:    WO/1998/052260    International Application No.:    PCT/US1998/010100
Publication Date: Fri Nov 20 00:59:59 CET 1998 International Filing Date: Fri May 15 01:59:59 CEST 1998
IPC: G02F 1/35
H01S 3/109
Applicants: EXCEL QUANTRONIX CORP.
ZHOU, Fuzheng
FU, Qiang
MAIKOWSKI, Michael
Inventors: ZHOU, Fuzheng
FU, Qiang
MAIKOWSKI, Michael
Title: INTRA-CAVITY AND INTER-CAVITY HARMONICS GENERATION IN HIGH POWER LASERS
Abstract:
Intra-cavity and/or inter-cavity sub-resonators (10, 20, 22, 50, 52, 32, 54) with dielectric coated mirrors (10, 50, 52, 54) have anti-reflection and high-reflection coatings to attain high efficiency third (32) and higher order harmonics generation of laser radiation. Main-resonators and sub-resonators enhance the fundamental and harmonic oscillation, respectively, which result is high conversion efficiency of third harmonics (32) and higer, such improved lasing efficiency may be implemented in higher power lasers for improved power performance to attain over 8 W of UV output power with a high repetition rate. The use of intra-cavity THG techniques provide high efficiency by using existing high intensities of the input fundamental frequencies available in the intra-cavity region of the laser to avoid damage to components of the laser, such as the laser crystal. The THG utilizes a double-pass and/or multi-pass arrangement, which results in about a 60 % increase in output power compared to a single pass configuration. Also, blocking of UV energy generated in a return pass is performed to eliminate damage by the UV to components in the main cavity.