We report the experimental demonstration of real-time magnetometry by detecting fluorescence from a nitrogen vacancy center in the setting of coherent population trapping and by estimating magnetic fields from the time series of the observed photon counts. We show that by taking into consideration the statistical properties of magnetic field fluctuations, a Bayesian inference-based estimator can effectively update dynamical information of the field in real time with the detection of just a single photon.
KEYWORDS: Nd:YAG lasers, Semiconductor lasers, Diodes, Solid state lasers, Rod lasers, YAG lasers, Light sources, Resonators, High power lasers, Refractive index
The major limitation of flashlamp-pumped solid-state lasers is the low overall efficiency. Replacing flashlamps with high power laser diodes allows an increase of system efficiency by over an order of magnitude. Because of the thermally induced stress fracture of the laser materials, power-scaling possibilities of end-pumped configurations are limited. Therefore side pump geometry has to be used for high power laser. The theory and the design of high power diode side-pumped Nd:YAG laser system is described. The Nd:YAG rod is side-pumped by diode laser arrays with wavelength at 808 nm. We analyze the result of our experiments and make some conclusions about the design of side-pumped laser.
In this paper, it is described that two common methods to determine the thermal lens focal length (both assistant lens and double beams) with the analysis of their theoretical error, and proposed a new method to measure thermal lens focal length (M2) based on the relative beam propagation of Gaussian single and multi modes beam. The calculated equations of thermal lens focal length using proposed M2 method were reckoned, and its effectiveness has been testified by both the theoretical analysis and the experimental research.
We report experimental studies of laser emission from a microcavity embedded with inhomogeneously broadened GaAs quantum wells. Extremely small lasing threshold is observed when the cavity resonance is tuned to the low energy tail of the inhomogeneous exciton distribution. Detailed experimental studies further show that the excitation level at the minimum lasing threshold is below the exciton Mott density and that the lasing process changes qualitatively when the excitation level is increased from below to above the exciton Mott density. A preliminary analysis indicates that the small lasing threshold observed is due to the enhanced dipole coupling rate in the microcavity as well as the very small number of localization sites resonant with the cavity when the cavity is tuned to the low energy tail of the inhomogeneous exciton distribution. The results also suggest the possibility of achieving laser emission from a few or even a single localized exciton by using cavities with higher Q-factor and greater dipole coupling rate.
Abstract
We report high resolution nonlinear laser spectroscopy studies of excitation relaxation
associated with the excitonic optical nonlinearity at room temperature and low temperature in
GaAs/AlGaAs multiple quantum wells. Using a new method of cw frequency domain four wave
mixing, we show that relaxation of the room temperature nonlinear optical response is
characterized by free carrier recombination and ambipolar diffusion. At low temperature, the
excitation relaxation for localized excitons is dominated by phonon assisted tunneling. In addition,
we use four wave mixing methods to eliminate contributions to the excitation line shape from
inhomogeneous broadening. The observed line shape is highly asymmetric and shows the presence
of spectral diffusion due to the phonon assisted tunneling associated with the excitation relaxation.
Conference Committee Involvement (2)
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XV
23 January 2011 | San Francisco, California, United States
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV
24 January 2010 | San Francisco, California, United States
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