We demonstrate a phase-conjugating mirror that has a continuous-wave power reflectivity much greater than unity (gain ~100). This mirror uses nonresonant degenerate four-wave mixing in a single crystal of barium titanate (BaTiO3). With our mirror we have (1) observed cw self-oscillation in an optical resonator formed by this mirror and a normal mirror, (2) demonstrated a cw oscillator that, in spite of phase-distorting material placed inside the resonator, will always emit a TEM00 mode, and (3) demonstrated an optical image amplifier. This mirror will work at any visible wavelength and with weak (milliwatt or weaker) pump beams.
© 1980 Optical Society of AmericaFull Article | PDF Article
CorrectionsJack Feinberg and R. W. Hellwarth, "Phase-conjugating mirror with continuous-wave gain: errata," Opt. Lett. 6, 257-257 (1981)
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