Y-branch coupled DFB-lasers based on high-order Bragg gratings for wavelength stabilization
Semicond. Sci. Technol., vol. 28. no. 035009 (2013).
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Y-branch coupled distributed-feedback lasers with 40th- and 80th-order surface Bragg gratings have been fabricated using a process based on I-line wafer stepper lithography. The devices allow dual wavelength lasing at around 975 nm.Wavelength spacing of 0.5 and 4 nm have been achieved by using grating period differences of 2.9 and 47.6 nm for the 40th- and 80th-order gratings, respectively. The manufactured devices with internal wavelength stabilization work as master oscillator power amplifiers with two separate and one common amplifier sections. We present optical output characteristics of the devices under continuous wave operation.
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany