A novel intensity modulator for second-harmonic waveguide lasers is proposed and theoretically analyzed. Noise caused by spectrum broadening in a diode-laser direct-modulation scheme is avoided in the suggested structure by using the electro-optic effect to modulate the phase mismatch in the frequency-doubling process. In the analysis the influence of waveguide parameters and electrode dimensions on the switching voltage, the output power, and the modulation bandwidth is evaluated. The results suggest that a switching voltage below the 5-V transistor-transistor logic level in digital systems is feasible and that, in a traveling-wave strip-electrode configuration, a modulation bandwidth in the gigahertz range can be obtained.
© 1993 Optical Society of America
Original Manuscript: April 9, 1992
Revised Manuscript: July 8, 1992
Published: March 1, 1993
Sten Helmfrid, Kimio Tatsuno, and Kenchi Ito, "Theoretical study of a modulator for a waveguide second-harmonic generator," J. Opt. Soc. Am. B 10, 459-468 (1993)