In this work we present a novel concept of compact broadband high resolution sum frequency generation spectroscopy system. Multiple channel picosecond fiber laser was used as a seed for narrowband (~1.5 cm-1 ) and broadband ultrafast radiation sources. In order to achieve >500 cm-1 linewidth widely tunable microjoule-level pulses in MIR spectral region (2 - 10 μm) broadband femtosecond source optimization was performed. Numerical simulations of various schemes with different nonlinear crystals and experimental results were presented and compared.
In this work we presented a compact femtosecond high average power (35 W), high energy (35 uJ) and high pulse repetition rate (1 MHz) laser system based on efficient room-temperature Yb:YAG crystal rod double-pass power amplifier and Yb doped fiber seed laser. High fidelity nearly transform-limited pulses (330 fs) were obtained by using matched dispersion pair of chirped fiber Bragg grating (CFBG) as a pulse stretcher and 4-pass diffraction grating based pulse compressor. Residual dispersion mismatch was compensated by applying linear thermal gradient along CFBG. Presented laser system is a compact and convenient solution for various industrial and scientific applications.
A compact high-power femtosecond (~640 fs) GHz intra-burst repetition rate all-in-fiber CPA system operating at 3.26 GHz intra-burst and 200 kHz burst repetition rate regime with two configurations of large mode area (LMA and PCF) cladding-pumped Yb-doped fiber power amplifiers were presented in this work. Significantly high average power levels of 6 W (LMA fiber power amplifier) and <20 W (PCF power amplifier) were achieved which corresponded to a maximum energy of 30 μJ and <100 μJ per burst respectively. Two burst shaping layouts were introduced in this experimental setup obtaining desired burst shape using one or two acousto-optic modulators, pulse repetition rate multiplier based on a cascaded 2×2 fiber coupler sequence with a splitting ratio of 50/50 and controlled using arbitrary waveform generator. High power all-in-fiber CPA system with LMA fiber power amplifier operating at GHz burst regime was compared to the system operating at MHz pulse repetition rate regime which allowed to achieve 1.5 μJ energy pulses of good pulse quality at the output of the laser system at a repetition rate of 4 MHz.
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