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Le Journal de Physique Colloques

10 HERTZ OPTICAL RESONANCE LINEWIDTHS IN Cr : YA103

Stephen Colby Rand, Duncan G. Steel

Published Oct 1, 1985• 0 citations
Publisher

Abstract

We have observed the nearly degenerate four-wave mixing (NDFWM) spectrum of Cr : YA103 using a new technique to eliminate the effects of laser jitter. The optical emission resonance at room temperature has a Lorentzian linewidth of 9.8 Hz, in excellent agreement with the measured longitudinal relaxation rate of 9.6 Hz on the 2E - 4A transition of Cr, determined by fluorescence decay.

DOI
10.1051/jphyscol:1985798

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We have observed the nearly degenerate four-wave mixing (NDFWM) spectrum of Cr : YA103 using a new technique to eliminate the effects of laser jitter. The optical emission resonance at room temperature has a Lorentzian linewidth of 9.8 Hz, in excellent agreement with the measured longitudinal relaxation rate of 9.6 Hz on the 2E - 4A transition of Cr, determined by fluorescence decay.
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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.
Laser-induced fluorescence line narrowing of the ruby R1{R}_{1}R1​ Zeeman spectra at 693.4 nm is reported using a continuous, stable, single-frequency ruby laser for resonant excitation. A resolution in excess of 107{10}^{7}107 corresponding to a linewidth of \ensuremath{\sim} 30 MHz has been achieved. The linewidths are anisotropic with respect to the relative magnetic-field-crystal-axis orientation and, at low Cr concentrations, are expected to be determined by Cr-Al superhyperfine interactions.
We report the first observation of the nearly degenerate four-wave--mixing spectrum of Nd3+{\mathrm{Nd}}^{3+}Nd3+-doped \ensuremath{\beta}''-Na-alumina. In a new application of continuous-wave high-resolution nearly degenerate four-wave mixing, a linewidth analysis of \ensuremath{\sim}1-kHz-wide optical resonances in heavily doped samples has been used to explain concentration-dependent, nonradiative decay of Nd ions which is obscured in conventional fluorescence-decay studies. Quantitative four-wave--mixing saturation studies also reveal a transition between a ``closed'' and an ``open'' quantum system due to pair interactions at a Nd density of \ensuremath{\sim}6\ifmmode\times\else\texttimes\fi{}1020{10}^{20}1020 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$.