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A monolithic integrated 2.8-mm colliding-pulse mode-locked laser is demonstrated to emit optical combs with switchable mode spacing for millimeter-wave generation. By selecting the DC-bias condition, the laser is forced to operate in harmonic mode locking regimes. Optical frequency combs with mode spacing of 2nd (30 GHz), 3rd (45 GHz), 4th (60 GHz) and 6th (90 GHz) harmonics are presented. The autocorrelation...
A monolithically integrated mode-locked laser cavity design with coupled feedback is proposed. It features switchable repetition rate. Optical frequency combs with mode spacing of 50 and 100 GHz are demonstrated. 350-GHz and 450GHz pulse trains are shown through autocorrelation traces.
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