In this paper we report a new method for double phase conjugation particularly suited to the tungsten bronze crystal strontium barium niobate. It has also been observed to produce conjugate waves in BaTiO(3) and BSKNN. This new arrangement is called the bridge conjugator because the two beams enter opposing [100] crystal faces and fan together to form a bridge without reflection off a crystal face. Our measurements indicate that the bridge conjugator is competitive with previously reported double phase conjugate mirrors in reflectivity, response time, ease of alignment, and fidelity.
A theoretical treatment of photothermal phase shift spectroscopy in a fluid medium for the most general conditions is given. The medium is assumed to be flowing. Results for a stationary medium appear as a special case. Both pulsed and cw excitation are considered. For pulsed excitation, the results are valid for excitation pulses of arbitrary length. For the cw case, modulated excitation is explicitly considered, and the results for unmodulated excitation appear as a special case.
Significant increases (x10) in both speed and gain of the beam fanning process were obtained via three different methods in SBN and BSKNN. These methods involve the creation of a dc electric field either (1) externally, (2) by the pyroelectric effect, or (3) by thermally cycling the crystal and the presence of laser radiation. The enhanced effects were observed for both ordinary and extraordinary polarized light.
A complete and rigorous theoretical treatment of the continuous wave photothermal deflection spectroscopy in a flowing medium is given. The theoretical results have been verified experimentally.
We review the current status of the photorefractive tungsten bronze ferroelectric crystals in terms of their electro -optic character and applications, with special emphasis on the current results for doped SBN:60 crystals.New results pertaining to phase conjugation and double phase conjugation (Bridge Conjugator) and the effects of internal fields on beam fanning are discussed.1.
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ABSTRACTWe review the current status of the photorefractive tungsten bronze ferroelectric crystals in terms of their electro-optic character and applications, with special emphasis on the current results for doped SBN:60 crystals. New results pertaining to phase conjugation and double phase conjugation (Bridge Conjugator) and the effects of internal fields on beam fanning are discussed.1.
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