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Applied Physics Letters

Effect of flow velocity on the photon statistics of a cw dye laser

R. Short, Rajarshi Roy, L. Mandeļ

Published Dec 1, 1980• 11 citations
Publisher

Abstract

The effect of changing the velocity of dye flow on the behavior of a cw dye laser is investigated by photon counting measurements. The results strongly suggest that changing the velocity over the range 10–13 m/sec merely changes the pump parameter, but leaves the other laser characteristics essentially unaltered. The average light intensity is found to be a linear function of flow velocity.

DOI
10.1063/1.91760

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The effect of changing the velocity of dye flow on the behavior of a cw dye laser is investigated by photon counting measurements. The results strongly suggest that changing the velocity over the range 10–13 m/sec merely changes the pump parameter, but leaves the other laser characteristics essentially unaltered. The average light intensity is found to be a linear function of flow velocity.
The fluctuation properties of a cw dye laser, pumped by an argon-ion laser, have been investigated by photon-counting and two-time correlation measurements. The results show significant departures from the usual single-mode laser theory in the region of threshold and below. However, there are indications that the departures may be due to extraneous rather than intrinsic effects, and when these effects are subtracted out, the results are in substantial agreement with the predictions of the usual theory.
The relative mean square fluctuations $\frac{〈{(\ensuremath{\Delta}I)}^{2}〉}{{〈I〉}^{2}}$ of the intensity III of a single-mode dye laser have been measured by a photon counting technique, in the region from about threshold to intensities 1000 times below threshold. The results show a steady increase of $\frac{〈{(\ensuremath{\Delta}I)}^{2}〉}{{〈I〉}^{2}}$ from less than 1 to about 150 as 〈I〉〈I〉〈I〉 is reduced, followed by a rapid drop to zero. This behavior appears to be described fairly well by an equation of motion containing both additive spontaneous emission fluctuations and multiplicative pumping fluctuations.
The probability distribution p(n)p(n)p(n) for the detection of nnn photons emitted by a single-mode dye laser in a short time at various excitations is measured, together with the distribution of time intervals between pairs of detected photons. The first measurement yields the probability density p(I)\mathcal{p}(I)p(I) and the moments of the light intensity III, and the second one the two-time intensity-correlation function. Measurements are also performed at three different wavelengths. p(I)\mathcal{p}(I)p(I) is found to have a two-component structure, and the relative intensity fluctuations $\frac{〈{(\ensuremath{\Delta}I)}^{2}〉}{{〈I〉}^{2}}$ grow, apparently without limit, as the excitation tends to zero, so that no thermal state is reached. A possible explanation in terms of pumping fluctuations is discussed. The correlation function has the form of a sum of three exponential functions, and the amplitudes and decay constants of the three components are derived. The effective decay-time constant exhibits a thirteenth-power-law dependence on frequency of the laser light.