A 1500-nm-band laser signal is upconverted to the mid-visible part of the spectrum by quasi-phase matched, sum-frequency generation with an 800-nm-band laser pump in a periodically poled KTiOPO<sub>4</sub>. For an appropriate combination of the two fundamental wavelengths, an acceptance bandwidth of 40–60 nm cm for the pump wavelength is attainable simultaneously with a temperature acceptance bandwidth of 60–70 °C cm in an angularly noncritical condition. Using a distributed feedback laser at 1590 nm and a Fabry-Perot laser at 807 nm, we demonstrate a temperature tolerance as large as 60 °C with a 10-mm-long crystal.
© 2004 Optical Society of America
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.7300) Lasers and laser optics : Visible lasers
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
Hajime Sakata, Yukio Furukawa, and Takayuki Yagi, "Type II Quasi-Phase-Matched Sum-Frequency Mixing of Diode Lasers in KTiOPO4 with Broad Spectral and Temperature Acceptance Bandwidths," Appl. Opt. 43, 4922-4928 (2004)