Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Cavity-modified spontaneous emission rate in Nd-glass microsphere

Baolong Lü, Yuzhu Wang, Yong Qing Li, Yashu Liu

Published May 11, 1993• 0 citations

Abstract

In this paper, we report the influence of cavity QED effect on the fluorescence spectra of Nd- glass microspheres. The relative magnitude of the spikes and the background in spectra are analyzed. The cavity QED enhancement of spontaneous emission rate is estimated to reach 16 times.

DOI: 10.1117/12.144116

Related papers

Observation of cavity quantum-electrodynamic effects in a Nd:glass microsphere

Yufan Wang, B. L. Lu, Yisen Li +1 more

In a Nd:glass microspherical cavity the enhancement and inhibition of spontaneous-emission processes that are due to cavity QED effects have been observed. The rates of the enhanced spontaneous emission are location dependent and reach a maximum value of more than 10(3) times the free-space value. The large enhancement strongly modifies the decay processes of Nd ions in glass, and the radiative properties of Nd:glass have been changed. As a result a new spectrum including new lasing wavelengths in the Nd:glass sphere has been observed.

Optics LettersApr 1, 199522 citations

Nd-glass microspherical cavity laser induced by cavity QED effects

Yuzhu Wang, Yong Qing Li, Yashu Liu +1 more

In a Nd-glass microspherical cavity the spontaneous enhancement and inhibition emission processes have been observed in the optical region. The rate of the enhanced spontaneous emission is larger than the free-space values for some transitions, so that some lasing lines of Nd-ion in glass have been observed, since the large enhancements of the transition rates may modify the decay processes in the multilevel system of the Nd-glass medium. A simple theoretical discussion is given to explain the possible mechanism of the lasing in the 740 nm and 810 nm wavelength regions. The micropherical cavity laser may be used in studies of Nd- glass microcavity spectroscopy and nonlinear optics.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEOct 1, 19914 citations

Cavity-QED-enhanced spontaneous emission and lasing in liquid droplets

A. J. Campillo, Jay D. Eversole, Horn-Bond Lin +1 more

Significant cavity QED enhancement have been observed of both spontaneous and stimulated emission in 10- to 14-micrometers diameter liquid microdroplets containing fluorophors. Direct emission lifetime reduction was observed as well as greatly enhanced lasing gain. Use of droplets provides an excellent test of cavity QED theory for spherical geometries. The mode number and order of the spherical cavity resonances responsible for the observed emission peaks were identified and their Q values calculated from Lorenz-Mie theory. An experimental procedure, based on equating stimulated gain to cavity losses, is used to estimate the magnitude of the enhancement. Spherical cavity Qs of only 2600 were found to lead to cavity enhancements of over 100 in the emission cross-section of Rhodamine 6G in agreement with theory.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIESep 1, 19910 citations

Tailoring Spontaneous Emission Lifetimes of Rare-Earths

D. Narayana Rao, G. Manoj Kumar, Suneel Pratap Singh +1 more

Spontaneous emission lifetimes of rare-earths are modified in a binary glass. The results are analyzed in the framework of local field. The parameter related to the radius of the cavity around the ion is determined.

Frontiers in OpticsJan 1, 20050 citations

Modification of spontaneous emission in Bragg onion resonators

Wei Ge Liang, Yanyi Huang, Amnon Yariv +2 more

We formulated an analytical model and analyzed the modification of spontaneous emission in Bragg onion resonators. We consider both the case of a single light emitter and a uniformly distributed ensemble of light emitters within the resonator. We obtain an expression for the average radiation rate of the light emitters ensemble and discuss the modification of the average radiation rate as a function of cavity parameters such as the core radius, the number of Bragg cladding layers, the index contrast of the Bragg cladding, and the refractive index of surrounding medium. We also consider the possibility of non-exponential decay of the light emitter ensemble due to the strong dependence of spontaneous emission on the location and polarization of individual light emitter. We conclude that Bragg onion resonators can both enhance and inhibit spontaneous emission by several orders of magnitude. This property can have significant impact in the field of cavity quantum electrodynamics (QED).

Optics ExpressJan 1, 200611 citations

Cavity-QED enhancement of fluorescence yields in microdroplets

Barnes, William Barclay Whitten, J. Michael Ramsey

Measurements of the integrated fluorescence yield of Rhodamine 6G (R6G) in levitated microdroplets (4 to 16 {mu}m diameter) display a size dependence which is attributed to a decreased probability per excitation cycle of photochemical bleaching as a result of cavity-enhanced spontaneous emission rates. The average number of fluorescence photons detected per molecule in 4 {mu}m droplets (where emission rate enhancement has been previously demonstrated) is shown to be approximately a factor of 2 larger than the yield measured for larger droplets where emission rate enhancement does not occur. Within some simple approximations, these results suggest that essentially no emission rate inhibition occurs in this system. A mechanism based on spectral diffusion is postulated for the apparent absence of cavity-inhibited emission and is illustrated by Monte Carlo calculations using time-dependent lineshape functions.

Dec 31, 19930 citations