1. Intensity correlation speckles as a technique for removing Doppler broadening
- Author
-
G. Tarlé, N. Green, I. Szapudi, and Roberto Merlin
- Subjects
Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,FOS: Physical sciences ,Order (ring theory) ,Quasar ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Correlation function (quantum field theory) ,01 natural sciences ,Electromagnetic radiation ,Spectral line ,Redshift ,010305 fluids & plasmas ,0103 physical sciences ,Atomic physics ,Astrophysics - Instrumentation and Methods for Astrophysics ,010306 general physics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Intensity (heat transfer) ,Physics - Optics ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Optics (physics.optics) ,Doppler broadening - 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 faraway sources that are inaccessible to conventional Doppler-free measurements. The technique, relying on a correction to ${g}^{(2)}$ of order ${N}^{\ensuremath{-}1}$, 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 redshifts of gravitationally lensed quasars.
- Published
- 2021