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Conference on Lasers and Electro-Optics

Self-pumped conjugation of the light beams by the stimulated resonance scattering in the inverted laser crystal

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

Published Jan 1, 1996• 0 citations
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Abstract

Summary form only given. The effect of self-pumped phase conjugation (SPPC) of the light beam in the inverted laser crystal (LC) by the parametric generation in the scheme with the feedback loop (FL) has been investigated in recent years. In this report we present the investigations of the SPPC by the stimulated resonance scattering (SRnS) in the inverted Nd:YAG-rod with the reciprocal FL.

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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.

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Double-pumped phase conjugation in inverted Nd:YAG

Darren Udaiyan, R.P.M. Green, D. H. Kim +1 more

An experimental study of double-pumped phase conjugation (DPPC) in a gain medium (Nd:YAG) is presented. The input–output energy and phase conjugate reflectivity of the system was experimentally characterized, with a maximum reflectivity of R∼160 observed. A self-starting DPPC laser was also produced by use of a feedback mirror, and spatial and temporal outputs are presented. The DPPC laser produced a TEM00 spatial mode output of 113 mJ in a 20-ns single-longitudinal mode pulse at a repetition rate of 10 Hz.

Journal of the Optical Society of America B•Aug 1, 1996•4 citations
Summary form only given. The effect of self-pumped phase conjugation (SPPC) of the light beam in the inverted laser crystal (LC) by the parametric generation in the scheme with the feedback loop (FL) has been investigated in recent years. In this report we present the investigations of the SPPC by the stimulated resonance scattering (SRnS) in the inverted Nd:YAG-rod with the reciprocal FL.
The effect of self-pumped phase conjugation (SPPC) of the light beam in the inverted laser crystal (LC) with the feedback loop was investigated in recent years. The possibility of SPPC in the reciprocal loop scheme is concerned with the refractive index grating which occurs due to difference of polarizability of the Nd ions in the metastable and the ground states [1]. The high efficiency of multipass geometry in the phase conjugation systems based on the laser crystals have been demonstrated for the degenerate four-wave mixing processes [2].
Self-pumped phase conjugation of the light beam in an inverted Nd:YAG-crystal with the different schemes of the feedback loop has been studied experimentally and theoretically. The quality of the phase conjugation of space heterogeneous beam, and the vibrational resistance for different polarizations of the input beam were investigated. The thresholds of parametric generation of the phase conjugated beam in the inverted media with real and imaginary parts of the nonlinear susceptibility are discussed.
It is well known that inverted laser crystals have a strong inertial optical nonlinearity that is connected with changing of susceptibility by saturation of laser transition. The phase conjugation (PC) of laser beams by parametric oscillation in resonator with holographic mirror induced by means of mutually-coherent pumping waves in an inverted laser crystal was discussed.1,2 In our work, the phase conjugation of laser beams in loop scheme with an inverted Nd:YAG-rod (where two near-counter-running light beams with orthogonal polarization intersected) was investigated.
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.
An experimental study of double-pumped phase conjugation (DPPC) in a gain medium (Nd:YAG) is presented. The input–output energy and phase conjugate reflectivity of the system was experimentally characterized, with a maximum reflectivity of R∼160 observed. A self-starting DPPC laser was also produced by use of a feedback mirror, and spatial and temporal outputs are presented. The DPPC laser produced a TEM00 spatial mode output of 113 mJ in a 20-ns single-longitudinal mode pulse at a repetition rate of 10 Hz.