Topic
Phase conjugation
About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.
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TL;DR: The theory of degenerate four-wave mixing using two-photon transitions is formulated, and because of the dynamic Stark-shifted line center, the reflection coefficient approaches a constant value at large intensities, unlike the two-level coefficient, which bleaches to zero.
Abstract: The theory of degenerate four-wave mixing using two-photon transitions is formulated. Two kinds of mechanisms compete in generating conjugate waves leading to two phenomena that do not occur in two-level media: (1) a double-peaked reflection spectrum and (2) coupled-mode oscillation in absorbing media. In addition, because of the dynamic Stark-shifted line center, the reflection coefficient approaches a constant value at large intensities, unlike the two-level coefficient, which bleaches to zero.
41 citations
Patent•
09 Sep 1994TL;DR: In this paper, a solid-state laser architecture producing a beam of extremely high quality and brightness, including a master oscillator (10) operating in conjunction with a zig-zag amplifier (16,30), an image relaying telescope (17), and a phase conjugation cell (20), was presented.
Abstract: A solid-state laser architecture producing a beam of extremely high quality and brightness, including a master oscillator (10) operating in conjunction with a zig-zag amplifier (16,30), an image relaying telescope (17) and a phase conjugation cell (20). One embodiment of the laser architecture compensates for birefringence that is thermally induced in the amplifier (16), but injects linearly polarized light into the phase conjugation cell (20). Another embodiment (19) injects circularly polarized light into the phase conjugation cell (20) and includes optical components that eliminate birefringence effects arising in a first pass through the amplifier (16,30). Optional features (26) permit the use of a frequency doubler assembly to provide output at twice optical frequencies, and an electro-optical switch or Faraday rotator (71) to effect polarization angle rotation if the amplifier material (16,30) can only be operated at one polarization. The zig-zag amplifier (16,30) is cooled by flow of cooling liquid, preferably using longitudinal flow to minimize temperature gradients in a vertical direction, and has cooling channel seals (50,52) disposed in dead zones that receive no light, to minimize optical damage to the seals (50,52). Light is input to the amplifier (16) at a near normal angle of incidence, to minimize polarization by reflection and to permit a polarizer (14) to be used to extract an output beam from the amplifier (16,30). Antireflective coatings (60) on edges and on sides of the amplifier (16,30) eliminate parasitic oscillations, and wedge-shaped windows (36) provide uniform pumping by eliminating gaps between diode arrays (32).
41 citations
TL;DR: In this article, phase conjugation reflection with efficiencies of 400% for microsecond pulses and ∼50% for picosecond pulses was obtained in saturable absorber dye solutions.
41 citations
41 citations
TL;DR: Using photorefractive two-wave mixing in a strontium barium niobate crystal in conjunction with a self-pumped barium titanate phase conjugator, it is demonstrated the cleanup of a phase-distorted laser beam.
Abstract: Using photorefractive two-wave mixing in a strontium barium niobate (SrxBa1−xNb2O6) crystal in conjunction with a self-pumped barium titanate (BaTiO3) phase conjugator, we have demonstrated the cleanup of a phase-distorted laser beam. A clean seed beam is amplified by the phase-aberrated pump beam through the photorefractive two-wave mixing process. The optical phase conjugation is used to eliminate the phase aberration introduced by the photorefractive gain medium.
41 citations