Frequency shifting and pulse shaping with photonic‐crystal fibers for coherent nonlinear spectroscopy

Abstract

The frequency-shifted and pulse-shaped output of photonic-crystal fibers (PCFs) pumped by amplified femtosecond Cr:forsterite laser pulses is employed for frequency-and time-resolved four-wave mixing (FWM) spectroscopy. Cross-correlation frequency-resolved optically gated laser-induced grating (LIG) technique is applied for the characterization of the pulse-shaped blue-shifted PCF output. The light pulses produced in the PCF are combined with the second-harmonic output of the Cr:forsterite laser, to probe a doublet of Raman resonances in the nonlinear response of a test object by means of coherent anti-StokesRaman scattering (CARS).

Coherent Raman spectroscopy of solid‐state broadband quantum memories

“…As one of promising directions for further research, integration of a PCF soliton wavelength shifter with a stretch of another fiber, for example, another PCF, designed to add a precisely calibrated, accurately tailored phase to the PCF soliton output, [34][35][36] can extend the broadband quantum-memory readout strategy demonstrated in this work to promising chirped-pulse quantum-memory schemes. [37,38] The time-to-space chirp transformation, needed for such memory schemes, has been already developed in the earlier work.…”

Advances in nonlinear optical spectroscopies: a historical perspective of developments and applications presented at ECONOS

“…[182,183] Zheltikov demonstrated the potential of a PCF-based light source for CARS and two-photon-resonant sumfrequency generation experiments. [184] The possibilities of frequency shifting and pulse shaping with PCFs were studied for applications in four-wave mixing spectroscopy by Linik et al [185] Moreover, a specially structured PCF enabled the generation of mode-separable supercontinuum emission. [186] The opportunities arising from the application of different spatial and spectral filtering approaches to tailor the output radiation for specific applications were laid out.…”

New developments in non‐linear optical spectroscopy

“…The next paper of this Special Issue demonstrates, how specifically designed photonic-crystal fibers (PCFs) present another way to modify the dispersion and spatial profile of ultra-short laser pulses. Such frequencyshifted and pulse-shaped laser pulses have been employed for frequency-and time-resolved FWM spectroscopy by Linik et al, 25 who demonstrate the power of tailored PCF light sources for non-linear optical measurements. A study of coherent population trapping (CPT) with phase-coherent bichromatic light from a mode-locked femtosecond laser is reported by Akimov et al 26 The authors report on the P. P. Radi and A. M. Zheltikov dependence of narrow resonances in rubidium vapour on power and magnetic field and discuss the perspectives in the use of the novel technique for phase-coherent Raman spectroscopy of CPT resonances in atoms with large energy separation of the lower levels.…”