We report what is to our knowledge the first observation of mechanism transformation with wavelength of self-pumped phase conjugation (SPPC) BaTiO3:Ce crystals in the near infrared. in It was found that the SPPC mechanism changed from a backscattering and four-wave-mixing mechanism to a cat mechanism when the pump wavelength was varied from 706 to 770 nm. In addition, SPPC was obtained when the pump beam entered the crystal by the +c face, and a variation with wavelength of optical beam paths in the crystal was also observed.

Mechanism transformation with wavelength of self-pumped phase conjugation in BaTiO(3):Ce.

High-efficiency self-pumped phase-conjugation at 633 nm in cerium-doped barium-titanate crystals

We report the use of actively stabilized holographic recording in high-diffraction-efficiency crystals in which strong energy coupling occurs We use this technique to characterize the photorefractive properties of a Ti-doped (KxNa1−x)2m(SryBa1−y)1−mNb2O6 crystal and compare our results with available data in the literature for other dopants and other crystals

Actively stabilized holographic recording for the measurement of photorefractive properties of a Ti-doped KNSBN crystal

We investigated some novel geometries of self-pumped phase conjugation (SPPC) and mutually pumped phase conjugation (MPPC), relying on total internal reflection both from the a face and from corners, with beams entering the negative c face of doped (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9 Nb2O6 crystals. The different situations for internal light paths and their direct transformation at the same incident wavelength were observed. Similarities and differences between SPPC and MPPC are discussed. The dynamic features of SPPC and MPPC in different situations were also observed. Three or more four-wave-mixing interaction regions were clearly observed inside the phase conjugators. The multistep interaction and its influence on the response rate and conjugation fidelity are analyzed. The large size of the samples seems necessary to ensure an optical path that is long enough for multistep bifurcation. The stability of the light channels is discussed based on the fanning effect.

Investigation into self-pumped and mutually pumped phase conjugation with beams entering the negative c face of doped (K(0.5)Na(0.5))(0.2)(Sr(0.75)Ba(0.25))(0.9)Nb(2)O(6)crystals.

Self-pumped phase conjugation with mechanism transformation in potassium sodium strontium barium niobate

We report the self-pumped phase conjugation of an 18°-cut Ce-doped (KyNa1−y)2m(SrxBa1−x)1−m Nb2O6 crystal at a 632.8-nm He–Ne laser wavelength. A maximum phase-conjugation reflectivity of 84.3% has been measured. In addition, its incident angular response and time response are measured.

Xinshe Su

Papers

Self-pumped phase conjugation of 18°-cut Ce-doped KNSBN crystal at 632.8 nm