This work deals with the compensation of frequency modulation to amplitude modulation (FM-to-AM) conversion due to gain spectral response of a regenerative amplifier. To do so, five designs of interference filters were tested. Direct measurements of FM-to-AM conversion were performed from temporal pulses as a function of wavelength using a 60 GHz bandwidth photodiode and oscilloscope. Additional numerical studies allowed us to find the best trade-off between low optical losses and compensation efficiency over a wide spectral range. With the best interference filter design, low amplitude modulation rate was over 2.0 nm spectral range whereas it was 0.4 nm without.
We performed direct measurements of phase-matching conditions of Second-Harmonic Generation (SHG) and Difference-Frequency Generation using the sphere method to determine reliable Sellmeier’s equations valid in the 1-12 microns transparency range of the new BGSe monoclinic nonlinear crystal. We also recorded SHG conversion efficiencies under and out-of phase-matching conditions to determine without the magnitudes and relative signs of the associated non zero quadratic nonlinear coefficients of BGSe. By combining all these data, we were able to calculate pump wavelengths enabling the generation of a widely tunable light in the infrared range from phase-matched Optical Parametric Generation.
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