75%-Efficiency blue generation from an intracavity PPKTP frequency doubler

R. Le Targat; J. J. Zondy; P. Lemonde

doi:10.1016/j.optcom.2004.11.081

75%-Efficiency blue generation from an intracavity PPKTP frequency doubler

R. Le Targat, J. J. Zondy, P. Lemonde

Department of Physics

Research output: Contribution to journal › Article

87 Citations (Scopus)

Abstract

We report on a high-efficiency 461 nm blue light conversion from an external cavity-enhanced second-harmonic generation of a 922 nm diode laser with a quasi-phase-matched KTP crystal (PPKTP). By choosing a long crystal (L _C = 20 mm) and twice looser focusing (w₀ = 43 μm) than the "optimal" one, thermal lensing effects due to the blue power absorption are minimized while still maintaining near-optimal conversion efficiency. A stable blue power of 234 mW with a net conversion efficiency of η = 75% at an input mode-matched power of 310 mW is obtained. The intra-cavity measurements of the conversion efficiency and temperature tuning bandwidth yield an accurate value d₃₃(461 nm) = 15 (±5%) pm/V for KTP and provide a stringent validation of some recently published linear and thermo-optic dispersion data of KTP.

Original language	English
Pages (from-to)	471-481
Number of pages	11
Journal	Optics Communications
Volume	247
Issue number	4-6
DOIs	https://doi.org/10.1016/j.optcom.2004.11.081
Publication status	Published - Mar 15 2005

Keywords

PPKTP
Second harmonic generation
Strontium
Thermal effects

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

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Le Targat, R., Zondy, J. J., & Lemonde, P. (2005). 75%-Efficiency blue generation from an intracavity PPKTP frequency doubler. Optics Communications, 247(4-6), 471-481. https://doi.org/10.1016/j.optcom.2004.11.081

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abstract = "We report on a high-efficiency 461 nm blue light conversion from an external cavity-enhanced second-harmonic generation of a 922 nm diode laser with a quasi-phase-matched KTP crystal (PPKTP). By choosing a long crystal (L C = 20 mm) and twice looser focusing (w0 = 43 μm) than the {"}optimal{"} one, thermal lensing effects due to the blue power absorption are minimized while still maintaining near-optimal conversion efficiency. A stable blue power of 234 mW with a net conversion efficiency of η = 75% at an input mode-matched power of 310 mW is obtained. The intra-cavity measurements of the conversion efficiency and temperature tuning bandwidth yield an accurate value d33(461 nm) = 15 (±5%) pm/V for KTP and provide a stringent validation of some recently published linear and thermo-optic dispersion data of KTP.",

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AU - Lemonde, P.

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N2 - We report on a high-efficiency 461 nm blue light conversion from an external cavity-enhanced second-harmonic generation of a 922 nm diode laser with a quasi-phase-matched KTP crystal (PPKTP). By choosing a long crystal (L C = 20 mm) and twice looser focusing (w0 = 43 μm) than the "optimal" one, thermal lensing effects due to the blue power absorption are minimized while still maintaining near-optimal conversion efficiency. A stable blue power of 234 mW with a net conversion efficiency of η = 75% at an input mode-matched power of 310 mW is obtained. The intra-cavity measurements of the conversion efficiency and temperature tuning bandwidth yield an accurate value d33(461 nm) = 15 (±5%) pm/V for KTP and provide a stringent validation of some recently published linear and thermo-optic dispersion data of KTP.

AB - We report on a high-efficiency 461 nm blue light conversion from an external cavity-enhanced second-harmonic generation of a 922 nm diode laser with a quasi-phase-matched KTP crystal (PPKTP). By choosing a long crystal (L C = 20 mm) and twice looser focusing (w0 = 43 μm) than the "optimal" one, thermal lensing effects due to the blue power absorption are minimized while still maintaining near-optimal conversion efficiency. A stable blue power of 234 mW with a net conversion efficiency of η = 75% at an input mode-matched power of 310 mW is obtained. The intra-cavity measurements of the conversion efficiency and temperature tuning bandwidth yield an accurate value d33(461 nm) = 15 (±5%) pm/V for KTP and provide a stringent validation of some recently published linear and thermo-optic dispersion data of KTP.

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KW - Second harmonic generation

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