Intensity correlation speckles as a technique for removing Doppler broadening
Optics
2021-04-22 v1 Cosmology and Nongalactic Astrophysics
Instrumentation and Methods for Astrophysics
Abstract
A method involving intensity correlation measurements is described, which allows for the complete removal of Doppler broadening in the emission of electromagnetic radiation from far-away sources that are inaccessible to conventional Doppler-free measurements. The technique, relying on a correction to g(2) of order N-1, probes the separation between neighboring spectral lines and is also applicable to the elimination of broadening due to collisions (N is the number of emitting particles and g(2) is the second-order field correlation function). Possible applications include a determination of cosmological parameters from red shifts of gravitationally-lensed quasars.
Cite
@article{arxiv.2104.10200,
title = {Intensity correlation speckles as a technique for removing Doppler broadening},
author = {R. Merlin and N. Green and I. Szapudi and G. Tarle},
journal= {arXiv preprint arXiv:2104.10200},
year = {2021}
}