Rhodium-Doped Barium Titanate Phase-Conjugate Mirror for an All-Solid-State, High-Repetition-Rate, Diode-Pumped Nd:YAG Master-Oscillator Power Amplifier Laser (original) (raw)
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Laser-diode self-pumped phase conjugation in cerium-doped barium titanate crystal
Optik, 2001
The performance of laser-diode (LD) self-pumped phase-conjugation (SPPC) using cerium-doped barium titanate (Ce:BaTiO 3 ) crystal was investigated. The reflectivity of the phase conjugator against the incident angle and the incident position was measured in two configurations, and the reflectivity could reach as high as 74%. According to the optical path patterns appearing in the crystal, it is believed that the LD-SPPC in Ce:BaTiO 3 is established by a stimulated photorefractive backscattering and four-wave mixing mechanism.
Optik, 2001
Self-pumped phase conjugation was performed in a photorefractive cerium-doped barium titanate crystal by nanosecond pulses from a laser diode. The reflectivity of the phase conjugator against the incident angle and the incident position was measured in two configurations. The steadystarte reflectivity of the pulsed phase-conjugate wave increases and the response time decreases as pulse width of incident pulses increases. Fig. 1. Setup for self-pumped phase-conjugate experiments using nanosecond pulses from a laser diode: PBS, polarizing beam splitter.
Enhanced wave mixing in photorefractive rhodium-doped barium titanate crystals
Optics Communications, 2000
We present an experimental study of the self-diffraction in Rh:BaTiO and BaTiO crystals for small angle between the 3 3 interfering laser beams. Much larger diffraction efficiencies and beam amplifications are measured in the self-diffraction pattern of Rh:BaTiO than in the corresponding pattern of undoped BaTiO crystals. The enhancement increases with the Rh 3 3 concentration in the barium titanate crystals. This effect cannot be explained by a simple Raman-Nath diffraction model, although it gives acceptable predictions for the undoped crystals, at small modulation index. In the same crystals, the results of self-diffraction in the Bragg regime remain in a good agreement with the existing theory.
Enhancement of the switched phase conjugate reflectivity in a BaTiO3 crystal
Optical Materials, 2004
We experimentally investigated the response of the photorefractive phase conjugation to a pulsed reading beam in an undoped BaTiO 3 crystal with a four-wave mixing geometry. A single longitudinal-mode Ar þ laser was used as a light source. The reading beam with a pulse width of $1 s was switched on after writing a steady-state grating in the crystal by two recording beams under a suitable condition and the generated phase conjugation was measured. The phase conjugate output was found to be increased by some factors of magnitude over the initial value for a given peak power and period of the reading pulses. A maximum of the enhanced reflectivity can be controlled by adjusting the interacting beam powers. An increase in the diffraction efficiency was also found with the same read-out process, which plays a key role to increase the phase conjugation as our knowledge.
Time response of a cerium-doped Sr_075Ba_025Nb_2O_6 self-pumped phase-conjugate mirror
Optics Letters, 1987
Self-pumping in cerium-doped strontium barium niobate has been observed with phase-conjugate reflectivities near 6% and a formation time of 8 sec for a 200-mW/cm 2 beam at 442 nm. The time response for asymmetrical selfdefocusing was also measured, and the observed transmissions through the crystal at normal incidence were limited to about 1.5% of the incident radiation.
Self-pumped phase conjugation with nanosecond pulses in strontium barium niobate
Optics Letters, 1990
We report the observation of self-pumped phase conjugation by means of internal reflection in a photorefractive medium produced by a series of intense nanosecond pulses. Nanosecond pulses from a YAG laser ranging in intensity from 9 X 104 to 9 X 105 W/cm 2 were used. The crystal was rhodium-doped strontium barium niobate.
Mutually pumped phase conjugation in photorefractive strontium barium niobate: theory and experiment
Journal of the Optical Society of America B, 1990
Two mutually incoherent laser beams can generate each other's phase-conjugate replica by sharing holograms in a photorefractive strontium barium niobate (SBN) crystal. The path of each beam inside the SBN crystal uses three internal reflections at the crystal faces. We discuss phase-conjugate imaging, moving gratings induced by an applied electric field, the time response of grating formation, and the dependence of the phaseconjugate reflectivity on the incident-beam ratio. Also, we derive the amplitude coupled-wave solutions for mutually pumped phase conjugators with two coupled gratings, and we compare the theoretical results with our experimental results.