TUNABLE 2ND-HARMONIC GENERATION IN A ND3-DOPED FIBER LASER USING A LINBO3-INTEGRATED MACH-ZEHNDER()

We report on a tunable neodymium-doped fiber laser using an intracavit y lithium niobate-integrated tuner. The device is a low-voltage asymme tric LiNbO3 Mach-Zehnder interferometer working as a tunable spectral filter. Laser emission occurs simultaneously at two wavelengths, lambd a(0) = 1088 nm and lambda(2) = 544 nm, due to the nonlinear properties of the crystal. The lasing wavelengths are tuned over ranges of 12 nm in the infrared and 6 nm in the green region with tuning rates of 0.2 5 and 0.12 nm/V, respectively. (C) 1998 Academic Press.