Nonlinear Optical Phase Conjugation

Interferometry with Phase Conjugate Mirrors and Measure of One-Way Velocity of Light

“…Consequently, the PCM maintains the polarization state of the incident wave, more precisely, a linear polarized wave is reflected as a linear polarized wave, while a circular polarized wave is reflected with identical circular polarization. (6) This behavior of a PCM is different from that of a conventional mirror, which inverts the circular polarization state of the light, and has an interesting consequence on the visibility of the interference in the phase-conjugate interferometer.…”

“…In general |µ|is less than 1, but it can be equal to or greater than 1 under well defined conditions. (6) The superposition of the two field after the second reflection in BS results in a total field traveling in the direction of detector BS…”

Guidestar-assisted wavefront-shaping methods for focusing light into biological tissue

“…Nonlinear optical phenomena may also act like a ‘conjugate mirror’ 73 to conjugate light through dynamic distortions 74 . Examples include stimulated Brillouin scattering, multiple-wave mixing and the photorefractive effect 75,76 . Although these approaches offer quick response times, the analog nature of nonlinear techniques precludes the ability to adjust their conjugation maps computationally.…”

Broadband time-reversal of optical pulses using a switchable photonic-crystal mirror

“…The standard solution in the optical regime is to use nonlinear processes such as ThreeWave or Four-Wave Mixing (3WM or 4WM, respectively), see e.g., [4,11,12,13]. However, while such techniques have been demonstrated experimentally, they usually suffer from one or several disadvantages.…”

“…A time-reversed pulse evolves as if time runs backward, thus eliminating any distortions or scattering that occurred at earlier times. This enables light detection, imaging and focusing through complex media [2,3] with applications in diverse fields such as medical ultrasound [2], communication systems and adaptive optics [4], superlensing [5], ultrafast plasmonics [6], biological and THz imaging [7], spintronics [8] and quantum information and computing [9].…”