Broadband mid-IR frequency comb with CSP and AGS from a Er,Tm:Ho fiber laser
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We report on the generation of a 2500 nm bandwidth frequency comb at 6.5 μm central wavelength based on critically phase-matched parametric down-conversion in the nonlinear crystal CdSiP 2 CdSiP2 (CSP), driven by a compact Er,Tm:Ho fiber laser. The generated ultra-broadband pulses show a transform-limited duration of 2.3 optical cycles and carry up to 150 pJ of energy at a 100 MHz pulse repetition rate. For comparison, the spectrum generated in AgGaS 2 AgGaS2 (AGS) spans from 6.2 to 7.4 μm at full-width at half-maximum (FWHM) with a pulse energy of 3 pJ. A full 3D nonlinear wave propagation code is used for optimization of the noncollinear angle, propagation direction, and crystal thickness.
CitationSánchez, D. [et al.]. Broadband mid-IR frequency comb with CSP and AGS from a Er,Tm:Ho fiber laser. "Optics Letters", 15 Desembre 2014, vol. 39, núm. 24, p. 6767-7000.