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Many different mode-locking techniques have been realized in the past [1, 2], but mainly focused on increasing the spectral bandwidth to achieve ultra-short coherent light pulses with well below picosecond duration. In contrast, no mode-locked laser scheme has managed to generate Fourier-limited nanosecond long pulses, which feature narrow spectral bandwidths (∼MHz regime) instrumental to applications...
We report an on-chip all-optical CMOS-compatible radio frequency spectrum analyzer with a bandwidth exceeding 2.5 THz, and use it to measure the intensity power spectra of mode-locked lasers with repetition rates up to 400 GHz.
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