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Quantum Electronics and Laser Science Conference

Stimulated resonance scattering of the light beam in the inverted Nd:YAG-crystal

Oleg L. Antipov, Sergey I. Belyaev, A.S. Kuzhelev

Published Jun 7, 1996• 0 citations
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Abstract

Summary form only given. There are a number of the well-known kinds of stimulated scattering in Nd:YAG laser crystals, including Raman scattering, Brillouin scattering, and thermal scattering. In this report we present for the first time the study of another type of stimulated scattering of the light beam with resonance frequency in the inverted media. The mechanism of this stimulated scattering is connected with the diffraction of the original beam on the moving refractive index grating caused by the wave of the metastable level population induced by the interference field of the incident wave and the scattered wave.

Related papers

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A new type of stimulated scattering of light is discovered in a Nd:YAG laser crystal with a population inversion. The scattering occurs for light at the resonance frequency of the laser transition, with a small anti-Stokes shift. It is shown that the effect is due to the appearance of a wave of population of the metastable level and the associated traveling index grating in a laser medium with different polarizability of the excited and unexcited atoms.

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Summary form only given. The authors experimental and theoretical investigations confirmed existence of refractive index grating (RIG) accompanied by population grating in inverted Nd:YAG laser. This result is in good agreement with our recent investigations of degenerate two-wave mixing and stimulated resonant backscattering of the optical beam in Nd:YAG laser amplifiers. The RIG in inverted Nd:YAG must be taken into account for understanding the nonlinear interactions of optical waves in laser amplifiers and oscillators.

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Dynamics of refractive-index changes in a Nd:YAG laser crystal under excitation of Nd^3+ ions

Oleg L. Antipov, A.S. Kuzhelev, Dmitry V. Chausov +1 more

The mechanism for refractive-index changes that accompany changes in population during pumping and amplification of an optical beam is studied in a Nd:YAG laser crystal by both resonant four-wave mixing and interferometric techniques. It is found that these refractive-index changes (connected with the difference in polarizability of excited and unexcited Nd3+ ions) have two components: a small noninertial component that accompanies an amplified optical pulse and the major changes that are intensified with a delay time of ∼3 µs. The latter effect is explained by population (or depopulation) of a higher-lying energy level 2(F2)5/2 of the 4f electron shell of Nd3+ ions, which has large polarizability in near-IR and visible light. The real part of the nonlinear optical resonant susceptibility of the inverted Nd:YAG caused by the refractive-index changes is also discussed.

Journal of the Optical Society of America B•Jul 1, 1999•19 citations

Resonant two-wave mixing of optical beams by refractive-index and gain gratings in inverted Nd:YAG

Oleg L. Antipov, Sergey I. Belyaev, A.S. Kuzhelev +1 more

It is shown experimentally that a weak optical signal in a Nd:YAG amplifier can have an extraordinarily large gain that is due to transient coherent nonlinear interaction with a strong laser beam. The effect is explained by the diffraction of the strong beam on the dynamic refractive-index grating induced in the interference field of the interacting optical waves and caused by the difference of polarizability of the excited and the unexcited Nd3+ ions. The numerical calculation confirmed the energy transfer from the strong beam to the weak one owing to the predominance of diffraction efficiency of the refractive-index grating over the gain grating in an inverted laser crystal. The investigations give the estimation of the ratio of the real and the imaginary parts of the resonant susceptibility of Nd:YAG at 1064 nm in the range 2–3.

Journal of the Optical Society of America B•Aug 1, 1998•22 citations
Summary form only given. There are a number of the well-known kinds of stimulated scattering in Nd:YAG laser crystals, including Raman scattering, Brillouin scattering, and thermal scattering. In this report we present for the first time the study of another type of stimulated scattering of the light beam with resonance frequency in the inverted media. The mechanism of this stimulated scattering is connected with the diffraction of the original beam on the moving refractive index grating caused by the wave of the metastable level population induced by the interference field of the incident wave and the scattered wave.
Summary form only given. The authors experimental and theoretical investigations confirmed existence of refractive index grating (RIG) accompanied by population grating in inverted Nd:YAG laser. This result is in good agreement with our recent investigations of degenerate two-wave mixing and stimulated resonant backscattering of the optical beam in Nd:YAG laser amplifiers. The RIG in inverted Nd:YAG must be taken into account for understanding the nonlinear interactions of optical waves in laser amplifiers and oscillators.
The mechanism for refractive-index changes that accompany changes in population during pumping and amplification of an optical beam is studied in a Nd:YAG laser crystal by both resonant four-wave mixing and interferometric techniques. It is found that these refractive-index changes (connected with the difference in polarizability of excited and unexcited Nd3+ ions) have two components: a small noninertial component that accompanies an amplified optical pulse and the major changes that are intensified with a delay time of ∼3 µs. The latter effect is explained by population (or depopulation) of a higher-lying energy level 2(F2)5/2 of the 4f electron shell of Nd3+ ions, which has large polarizability in near-IR and visible light. The real part of the nonlinear optical resonant susceptibility of the inverted Nd:YAG caused by the refractive-index changes is also discussed.
It is shown experimentally that a weak optical signal in a Nd:YAG amplifier can have an extraordinarily large gain that is due to transient coherent nonlinear interaction with a strong laser beam. The effect is explained by the diffraction of the strong beam on the dynamic refractive-index grating induced in the interference field of the interacting optical waves and caused by the difference of polarizability of the excited and the unexcited Nd3+ ions. The numerical calculation confirmed the energy transfer from the strong beam to the weak one owing to the predominance of diffraction efficiency of the refractive-index grating over the gain grating in an inverted laser crystal. The investigations give the estimation of the ratio of the real and the imaginary parts of the resonant susceptibility of Nd:YAG at 1064 nm in the range 2–3.