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Stimulated Rayleigh-Bragg scattering enhanced by two-photon excitation

Guang S. He, Tzu-Chau Lin, and Paras N. Prasad

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Abstract

A frequency-unshifted and backward stimulated Rayleigh scattering can be produced in a linearly transparent but two-photon absorbing medium. Using a novel two-photon active dye solution as the nonlinear medium pumped by 532-nm and ~10-ns laser pulses, a highly directional backward stimulated scattering at the pump wavelength can be readily observed. The experimental results on spectral structure, spatial and temporal behaviors, and output/input relationship of this new type of stimulated scattering are presented. To explain the observed phenomenon and its experimental behaviors, a physical model of feedback mechanism provided by a two-photon-excitation enhanced Bragg grating inside the scattering medium is proposed. Comparing to other types of stimulated scattering, the stimulated Rayleigh-Bragg scattering exhibits the advantages of no-frequency shift, low threshold, and low requirement for pump spectral line-width.

©2004 Optical Society of America

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Figures (8)
Fig. 1.
Fig. 1. Linear absorption spectral curves for solutions of P RL802 in THF and for pure solvent THF. The chemical structure of the solute is shown in the top-right corner.

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Fig. 2.
Fig. 2. Experimental setup for observation of backward stimulated Rayleigh scattering from a two-photon absorbing dye solution.

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Fig. 3.
Fig. 3. (a) Two -photon excited fluorescence spectrum; (b) Decay of two-photon excited fluorescence emission.

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Fig. 4.
Fig. 4. Fabry-Perot interferograms of (a) the backward stimulated Rayleigh scattering beam from a 1-cm PRL802/THF solution of 0.01 M concentration, (b) a half of the 532-nm input pump beam, and (c) the two beams together. Pump line-width was ~0.08 cm-1 and the free spectral range of the Fabry-Perot interferometer was 0.5 cm-1.

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Fig. 5.
Fig. 5. Fabry-Perot interfemogram formed by both the backward stimulated Brillouin scattering beam (whole rings) from a 1-cm long THF solvent and the input pump laser beam (half-rings).

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Fig. 6.
Fig. 6. Measured waveforms of the pump pulse and backward stimulated Rayleigh scattering pulse at three input intensity levels: (a) 95 MW/cm2, (b) 130 MW/cm2, and (c) 180 MW/cm2.

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Fig. 7.
Fig. 7. Measured near-field patterns (a) and far-field patterns (b) of the pump beam (left) and backward stimulated Rayleigh scattering beam (right) at input intensity level of 160 MW/cm2.

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Fig. 8.
Fig. 8. (a) Measured nonlinear transmission of 532-nm pump pulses, the red dashed line is the fitting curve with a 2PA coefficient of β=9.46 cm/GW; (b) Measured output stimulated scattering energy vs. input pump energy.

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Equations (5)

Equations on this page are rendered with MathJax. Learn more.

I ′ ( z ) = ( I 1 + I 2 ) + 2 I 1 I 2 cos ( 4 π n 0 z / λ 0 ) .
Δ n ( z ) = n 2 Δ I ( z ) = 2 n 2 I 1 I 2 cos ( 4 π n 0 / λ 0 ) = δ n 0 cos ( 4 π n 0 z / λ 0 ) .
R = t h 2 ( 2 π n 2 I 1 I 2 · L / λ 0 ) ,
R I 1 ≫ I 2 { 1 − exp [ − α ( λ 0 ) L ] } ,
( 2 π n 2 / λ 0 ) 2 L I 1 2 ≥ α ( λ 0 ) .
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