Optical frequency stabilisation of high-power laser diodes under modulation using short optical waveguides
A waveguide stabilised laser diode (WSLD) demonstrated high-power single optical frequency operation under both CW and modulated conditions. This device consisted of an AlGaAs CSP laser coupled to an external cavity constructed from a 200 μm-long single-mode ion-exchange waveguide. With an average optical power of 9 mW, the WSLD demonstrated a side-mode suppression ratio greater than 570:1 under CW conditions and greater than 310:1 under modulation with a modulation index of greater than 0.95 at 250 MHz.