Open AccessEnhanced output power for phase-matched second-harmonic generation at 10.6 μm in a ZnGeP_2 crystal
Author(s) -
Yi Jiang,
Yujie J. Ding
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.012699
Subject(s) - materials science , optics , energy conversion efficiency , second harmonic generation , laser , harmonic , crystal (programming language) , phase matching , power (physics) , nonlinear optics , wavelength , phase (matter) , optoelectronics , physics , quantum mechanics , computer science , programming language
Second-harmonic generation was phase-matched at the fundamental wavelength of 10.6 mum in an annealed ZnGeP(2) crystal at room temperature. Our results demonstrated that the phase-matching angle was decreased with increasing the pump power. Such a unique dependence resulted in a significant enhancement on the second-harmonic output power. The highest average output power at 5.3 mum was 55 mW for an average pump power of 5.0 W, which corresponded to a conversion efficiency of 1.1%. Due to the laser-induced heating effect, the second-harmonic output power was increased by 65%. Such an efficient conversion was made possible also by using a short-pulse repetition-frequency-excited waveguide and single-longitudinal-mode CO(2) laser as a fundamental beam.