Physical Review Letters

Two-Photon Laser

B. Nikolaus, D. Z. Zhang, P. E. Toschek

Published Jul 20, 1981• 106 citations

Abstract

We have demonstrated a pulsed two-photon laser at the transition $3d^{2}D\ensuremath{-}2s^{2}S$ of atomic Li (frequency ${\ensuremath{\omega}}_{31}$) by (i) generation of a coherent light beam at ${\ensuremath{\omega}}_{x}$, stimulated by light pulses at ${\ensuremath{\omega}}_{1}={\ensuremath{\omega}}_{31}\ensuremath{-}{\ensuremath{\omega}}_{x}$, and (ii) single-pass amplification of injected light at ${\ensuremath{\omega}}_{3}=\frac{{\ensuremath{\omega}}_{31}}{2}$.

DOI: 10.1103/physrevlett.47.171

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Physical Review Letters

Two-Photon Laser

B. Nikolaus, D. Z. Zhang, P. E. Toschek

Published Jul 20, 1981• 106 citations

Publisher

Abstract

We have demonstrated a pulsed two-photon laser at the transition

3d^{2}D\ensuremath{-}2s^{2}S

of atomic Li (frequency

{\ensuremath{\omega}}_{31}

) by (i) generation of a coherent light beam at

{\ensuremath{\omega}}_{x}

, stimulated by light pulses at

{\ensuremath{\omega}}_{1}={\ensuremath{\omega}}_{31}\ensuremath{-}{\ensuremath{\omega}}_{x}

, and (ii) single-pass amplification of injected light at

{\ensuremath{\omega}}_{3}=\frac{{\ensuremath{\omega}}_{31}}{2}

DOI: 10.1103/physrevlett.47.171

Related papers

Lithium vapour excitation at 2S $\mathsf{\rightarrow}$ 3D two-photon resonance

Irena Labazan, Slobodan Milošević

The European Physical Journal DJan 1, 200012 citations

Direct measurement of stimulated emission in two-photon downconversion

L. J. Wang, X. Y. Zou, L. Mandeļ

Measurements have been made of the rate at which signal photons are produced in a nonlinear crystal in the process of parametric downconversion, when a coherent light beam from a He:Ne laser is injected into the crystal in the direction of the conjugate-idler photons. The latter provides a stimulating field for the downconversion. When the phase matching condition inside the nonlinear medium is satisfied, the rate of downconversion is enhanced by the presence of the He–Ne laser beam by a factor of the form 1 + βIi, where li is the intensity of the He:Ne laser beam. The effect of defocusing either the pump beam or the He–Ne idler beam is investigated. Possible use of this phenomenon to study the photon amplifier with single-photon input will be discussed.Measurements have been made of the rate at which signal photons are produced in a nonlinear crystal in the process of parametric downconversion, when a coherent light beam from a He:Ne laser is injected into the crystal in the direction of the conjugate-idler photons. The latter provides a stimulating field for the downconversion. When the phase matching condition inside the nonlinear medium is satisfied, the rate of downconversion is enhanced by the presence of the He–Ne laser beam by a factor of the form 1 + βIi, where li is the intensity of the He:Ne laser beam. The effect of defocusing either the pump beam or the He–Ne idler beam is investigated. Possible use of this phenomenon to study the photon amplifier with single-photon input will be discussed.

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Physical Review AMay 12, 20050 citations

We have demonstrated a pulsed two-photon laser at the transition

3d^{2}D\ensuremath{-}2s^{2}S

of atomic Li (frequency

{\ensuremath{\omega}}_{31}

) by (i) generation of a coherent light beam at

{\ensuremath{\omega}}_{x}

, stimulated by light pulses at

{\ensuremath{\omega}}_{1}={\ensuremath{\omega}}_{31}\ensuremath{-}{\ensuremath{\omega}}_{x}

, and (ii) single-pass amplification of injected light at

{\ensuremath{\omega}}_{3}=\frac{{\ensuremath{\omega}}_{31}}{2}

n

-photon $(n\ensuremath{\geqslant}4)$ SHRS processes only if absorption of fluorescence pump light occurs in the first three transitions of the

n

-photon sequence representing the process unit step. Estimates of the amount of optical gain that could be produced in such a system indicate that it should be sufficient to allow multiwatt cw laser operation to occur on one set of $\ensuremath{\Lambda}$ transitions connecting levels in a ``double-$\ensuremath{\Lambda}$'' structure, with the pump light being discharge-produced fluorescence centered about the transitions of the other $\ensuremath{\Lambda}$ pair. However, to initiate operation of such a device would require injection into the laser optical cavity of intense ``starter'' laser pulses at both lasing frequencies. What should be an optimal experimental configuration for determining feasibility of the proposed laser device is described. In the suggested configuration, Cs-atom $6{S}_{1∕2}\text{\ensuremath{-}}6{P}_{1∕2}$ transitions form the double-$\ensuremath{\Lambda}$ structure.