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When adhesive free bonded (AFB) periodically-inverted potassium titanyl phosphate (KTiOPO4, KTP) plates were used as a nonlinear medium inside a cavity, coupled optical parametric oscillators (OPOs) were implemented [1]. As a result, two signal waves and two idler waves can be simultaneously generated. In singly resonant OPOs, two idler waves were used to efficiently generate THz waves [2]. When a...
THz radiation was generated by mixing idler-idler waves from coupled optical parametric oscillators based on stacked KTP plates. Power enhancement, noise reduction, and linewidth narrowing have been attributed to noise reduction between idler waves.
By mixing three nearly-even-spaced optical frequencies generated by coupled optical parametric oscillators based in KTP stacks and bulk KTP in a nonlinear medium, we demonstrate coherent interference of THz waves.
Based on adhesive-free-bonded periodically-inverted KTP plates, we have generated a phase-conjugated beam that is insensitive to polarization of the input beam. Such a process can be used to correct a blurred image caused by turbulence.
Phase conjugation can be used to correct blurred images caused by atmospheric turbulence and scattering of light by biological tissues. In the past, phase-conjugation devices based on photorefractive effect have response times of 100 µs – 1 s [1]. Four-wave mixing in a third-order nonlinear medium can be also used to achieve optical phase conjugation [2]. This scheme, demonstrated in Ref. [3], requires...
We show that backward difference-frequency generation can be exploited to achieve phase conjugation in a second-order nonlinear medium. Our calculation shows that a reflectivity of close to 100% is achievable from a 1 mW laser.
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