75%-efficiency blue generation from an intracavity PPKTP frequency doubler
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 (LC=20 mm) and twice looser focusing (w0=43 m) 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 eta=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 pm/V for KTP and provide a stringent validation of some recently published linear and thermo-optic dispersion data of KTP.
Keywords
Cite
@article{arxiv.physics/0408031,
title = {75%-efficiency blue generation from an intracavity PPKTP frequency doubler},
author = {Rodolphe Le Targat and Jean-Jacques Zondy and Pierre Lemonde},
journal= {arXiv preprint arXiv:physics/0408031},
year = {2009}
}