Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Le Journal de Physique Colloques

CONTINUOUS-WAVE PHASE CONJUGATION WITH F-AGGREGATE COLOR CENTERS IN LiF

Stephen Colby Rand

Published Oct 1, 1985• 0 citations
Publisher

Abstract

We report the first observation of continuous degenerate four-wave mixing (DFWM) with color centers in LiF. Using a new technique which permits subkilohertz resolution, we have also observed the nearly degenerate four-wave mixing (NDFWM) spectrum in the visible spectral region.
DOI
10.1051/jphyscol:1985790

Related papers

Intersystem crossing of F_2 color centers studied by four-wave mixing spectroscopy

Stephen Colby Rand

We report the first observation to our knowledge of continuous-wave four-wave mixing and phase conjugation using color centers. The resonance in γ-irradiated LiF at room temperature is shown to arise from saturated absorption involving intersystem crossing of F2 centers and has a width that reveals the excited-triplet to ground-state-singlet decay rate. This is confirmed by direct measurement of the nearly degenerate four-wave mixing spectrum in the visible spectral region using a jitter-free technique. The observed Lorentzian linewidth of 4.70 Hz (FWHM) is in excellent quantitative agreement with the independently measured phosphorescent decay rate of the lowest triplet levels and a calculation of the spectral response of this three-level spin system owing to decay of ground-state spatial hole burning. The linewidth is predicted to be strongly temperature dependent and indeed narrows to 2.1 Hz on cooling to only −25°C.

Optics Letters•Mar 1, 1986•11 citations

Nonlinear optical phase conjugate effect caused by F 2 - color center in LiF crystals

Tao Zhang, Liangfeng Wan, Ruan Yong-feng

We report the experimental observation of nonlinear optical phase conjugate (NOPC) effect caused by the resonant saturable absorption of F 2 - centers in LiF crystals. The experiment was performed by making use of degenerate four-wave mixing in the laser cavity. We also give the curve of the phase conjugate reflectivity versus the incident energy of the probe light.

Chinese Physics Letters•Aug 1, 1985•2 citations

Four-wave mixing studies in Cr:YAlO_3 for application to optical phase conjugation

Duncan G. Steel, Stephen Colby Rand, Jing Liu

We describe detailed studies of the degenerate and nearly degenerate four-wave mixing (DFWM and NDFWM, respectively) response in Cr:YAlO3 of importance to optical phase conjugation. We report on measurements of the DFWM response as a function of pump intensity and wavelength. We also report on measurements of the temporal response of the material and compare the results with the NDFWM response. Finally, we present an analysis of the NDFWM spectral response in the presence of strong pumps.

Journal of the Optical Society of America B•Nov 1, 1987•7 citations

Observation of resonantly enhanced degenerate four-wave mixing in doped alkali halides

David E. Watkins, Joseph F. Figueira, Stewart J. Thomas

We describe the first reported observation of resonantly enhanced phase conjugation through degenerate four-wave mixing (DFWM) in doped alkali halides. We also describe the first reported quantitative comparison of the resonant DFWM process in the infrared with the theory of Abrams and Lind [Opt. Lett. 2, 94 (1978); 3, 205 (1978)]. The comparison for small values of alpha0L is shown to be excellent. For alpha0L in excess of 3, experiment and theory diverge because of pump attenuation by the resonant medium.

Optics Letters•Apr 1, 1980•29 citations

Temporal development of phase conjugation in ruby by degenerate four-wave mixing

Simon Boothroyd, Christopher G. Morgan

The behaviour of phase conjugated waves produced by degenerate four-wave mixing (DFWM) at 488.0 and 514.5 nm of laser beams in ruby crystals has been examined at large pulsed pump beam intensities and enhanced reflectivities observed.

Journal of Physics D Applied Physics•Aug 14, 1983•12 citations

Nearly degenerate four wave mixing in DFB lasers

Antonio Mecozzi, P. Spanò, Alessandro D’Ottavi +1 more

Degenerate Four Wave Mixing (DFWM) and Nearly Degenerate Four Wave Mixing (NDFWM) have attracted a considerable attention in non-linear optics. DFWM has found several applications in phase conjugation, used in real time holography and adaptive optics. To realize a higher amplification of the conjugate wave, semiconductor amplifiers have been used. A theoretical analysis of the NDFWM process has been presented by Agrawal [1]. Here, an experimental and theoretical analysis of NDFWM in Distributed Feedback (DFB) lasers is proposed, where the FWM efficiency is enhanced by the cavity feedback mechanism.

IEEE International Semiconductor Laser Conference (ISLC)•Aug 24, 2005•1 citation
We report the first observation to our knowledge of continuous-wave four-wave mixing and phase conjugation using color centers. The resonance in γ-irradiated LiF at room temperature is shown to arise from saturated absorption involving intersystem crossing of F2 centers and has a width that reveals the excited-triplet to ground-state-singlet decay rate. This is confirmed by direct measurement of the nearly degenerate four-wave mixing spectrum in the visible spectral region using a jitter-free technique. The observed Lorentzian linewidth of 4.70 Hz (FWHM) is in excellent quantitative agreement with the independently measured phosphorescent decay rate of the lowest triplet levels and a calculation of the spectral response of this three-level spin system owing to decay of ground-state spatial hole burning. The linewidth is predicted to be strongly temperature dependent and indeed narrows to 2.1 Hz on cooling to only −25°C.
We describe the first reported observation of resonantly enhanced phase conjugation through degenerate four-wave mixing (DFWM) in doped alkali halides. We also describe the first reported quantitative comparison of the resonant DFWM process in the infrared with the theory of Abrams and Lind [Opt. Lett. 2, 94 (1978); 3, 205 (1978)]. The comparison for small values of alpha0L is shown to be excellent. For alpha0L in excess of 3, experiment and theory diverge because of pump attenuation by the resonant medium.
Degenerate Four Wave Mixing (DFWM) and Nearly Degenerate Four Wave Mixing (NDFWM) have attracted a considerable attention in non-linear optics. DFWM has found several applications in phase conjugation, used in real time holography and adaptive optics. To realize a higher amplification of the conjugate wave, semiconductor amplifiers have been used. A theoretical analysis of the NDFWM process has been presented by Agrawal [1]. Here, an experimental and theoretical analysis of NDFWM in Distributed Feedback (DFB) lasers is proposed, where the FWM efficiency is enhanced by the cavity feedback mechanism.