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 |
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Pages (from-to) | 471-481 |
Number of pages | 11 |
Journal | Optics Communications |
Volume | 247 |
Issue number | 4-6 |
DOIs | |
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