Recovery of spectral features readout with frequency-chirped laser fields

Abstract

A data-processing technique is proposed for use with conventional frequency-chirped absorption spectroscopy to ensure accurate mapping of spectral features into time-domain signatures with arbitrarily fast readout chirp rates. This technique recovers the spectrum from a signal that is distorted owing to the fast chirp rate and therefore facilitates fast measurement of the spectral features over a broad spectral range with high resolution. Both numerical simulations and experimental results are presented.

Towards an efficient atomic frequency comb quantum memory

“…For most comb measurements we chose to scan the laser over one peak only and lowered the scan rate to a minimum. This is to reduce the effect of the scan rate on the measurement resolution [40,35]. By varying the rate we confirmed that the measured width was indeed independent of the scan rate.…”

Wideband RF spectral analyzer based on spectral-spatial holography in : achieved with a highly stabilized frequency chirped laser

“…Because of the better chirp spectral purity, the readout gets the behavior predicted in Ref. [8]. Indeed, one can see the expected ringing in the detected signal.…”

“…In all this discussion, we neglect the linear dispersion associated with interrogating narrow holes with fast chirps [8]. Since E RF and E P are collinear, the detected intensity is given by…”

“…Using the laser noise characteristics described by Fig. 6(a) and the model based on the propagation of chirped electric field in a spectrally shaped media [8], one can explain the SHB experiment improvement in terms of resolution by using a stabilized frequency chirped laser. In this model, we start by simulating the PSD of the frequency noise.…”

“…6(c). The generated time series can be used as a temporal frequency noise to simulate the analysis of a Lorentzian spectral hole with FWHM G h [8]. The resulting spectral features readout with a unstabilized (or stabilized) chirped laser are presented in Fig.…”