An external-cavity 1560-nm diode laser was frequency doubled in a 3-cm-long periodically poled LiNbO3 waveguide doubler with 120% W−1 conversion efficiency. The 780-nm light was used to detect the D2 transitions of Rb, and the laser frequency was locked to Doppler-broadened lines of Rb. Furthermore, the ~1 μW of second-harmonic power was sufficient for detecting the sub-Doppler lines of Rb, and the laser was locked to a 87Rb crossover line.
© 1996 Optical Society of America
Original Manuscript: February 27, 1996
Published: August 15, 1996
Vered Mahal, Mark A. Arbore, Martin M. Fejer, and Ady Arie, "Quasi-phase-matched frequency doubling in a waveguide of a 1560-nm diode laser and locking to the rubidium D2 absorption lines," Opt. Lett. 21, 1217-1219 (1996)