Figure - available from: Optics Express
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(a) Experimental and reconstructed FROSt traces without additional fused silica. (linear scale) (b) Experimental and reconstructed FROSt trace for 6 mm of fused silica. (linear scale) (c) Retrieved temporal (top) and spectral (bottom) profiles of the pulse in intensity (blue line) and phase (orange line) for different thicknesses of fused silica placed in the beam path. The indicated durations are the FWHM of the peak intensity.
Source publication
In this work, we demonstrate the sensitivity of the frequency-resolved optical switching (FROSt) technique to detect a small amount of spectral phase shift for the precise characterization of ultrashort laser pulses. We characterized fs pulses centered at 1.75 µm that are spectrally broadened up to 700 nm of bandwidth in a hollow-core fiber and sub...
Citations
... The generated octave-spanning mid-IR pulse is characterized using FROSt. FROSt is a phase-matching-free characterization technique that was recently used to characterize two-octave-spanning infrared pulses [21,22]. In FROSt, a pump pulse is used to excite free-carriers in a semiconductor sample creating a sharp absorption edge in time which acts as an optical gate for characterizing a probe pulse. ...
Dispersion management of few-cycle pulses is crucial for ultrafast optics and photonics. Often, nontrivial dispersion is compensated using complex optical systems or minimized through careful design of waveguides. Here, we present dispersion-managed adiabatic frequency conversion enabling efficient downconversion of an 11.1-fs near-IR pulse to an 11.6-fs mid-IR pulse spanning an octave of bandwidth from 2-4 $\mu$m. The adiabatic frequency converter is designed to impart a constant group delay over the entire bandwidth, eliminating the need for complex dispersion management and opening a new avenue for dispersion engineering in ultrafast optics and photonics. Notably, dispersion engineering through the position-dependent conversion position of an adiabatic conversion device constitutes an additional mechanism for dispersion control in ultrafast optics and photonics while maintaining high conversion efficiency for broadband pulses.
... Based on transient absorption in solids, the FROSt technique is free of phase-matching constraints (i.e. nonlinear conversion is not required) and polarization-independent [29,30]. By using a pump pulse to switch the optical transmission of a solid, FROSt allows the characterization of a pulse (the probe) by analyzing its resulting transmission through the material as a function of pump-probe time delay. ...
We demonstrate experimentally that frequency resolved optical switching (FROSt) can be used to characterize ultra-broadband pulses at high repetition rates up to 500 kHz. Specifically, we present the complete temporal characterization of an optical parametric amplifier (OPA), from the supercontinuum (SC) to the second stage of amplification. Simultaneous characterization of co-propagating signal and idler pulses enables retrieval of their group delay, as well as their temporal phase and intensity. Our study focuses on an extensive frequency range spanning the infrared region (1.2 to 2.4 µm) and confirms the strength and convenience of FROSt as a single tool for characterizing a wide range of pulses at high repetition rates.
