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We demonstrated ultra-flat optical frequency comb generation only using a set of conventional Mach-Zehnder modulator asymmetrically dual-driven by large-amplitude sinusoidal signals with different amplitudes. 19-channel 10-GHz-spaced frequency comb with <4.6-dB spectral ripple was experimentally generated.
The contribution of the buried Si-SiO2 interface strain to second-harmonic generation (SHG) is observed and isolated clearly from internal electric-field-induced SHG by applying external deformation of specific geometry to (100) crystalline silicon plate.
We present new results on the use of low-loss, deeply modulated waveguides to enhance the flux of high harmonic emission at short wavelengths. This is achieved by quasi-phase matched frequency conversion to increase the coherence length.
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