Optical Phase Conjugation with Photorefractive Sn2P2S6
Abstract
This report results from a contract tasking Dynamic Holography Group, Institute of Physics. National Academy of Sciences as follows: The contractor will investigate getting the largest possible phase conjugate reflectivity in Sn2P2S6 by optimizing the usual parameters (such as pump intensity ratio, signal to pump intensity ratio, angle of incidence for pump and probe waves, polarization of interacting waves, orientation of waves with respect to sample principle axes) and frequency shift, a new parameter of special importance of Sn2P2S6. To achieve this the contractor shall perform the following: (1) The backward wave from four wave mixing will be used to generate the phase conjugate waves. Optimum conditions will be found to accomplish this. (2) Study different self-phase conjugate mirrors based on various coherent optical oscillators Optimize the performance of a double phase conjugating mirror. The study shows that SPS crystal can be efficiently used for conjugation of coherent light beams both in traditional backward-wave four-wave mixing geometry and in self-pumped coherent oscillator geometries. The samples belonging to Type I are suitable for conjugation both in the red (He-Ne laser light) and in near infrared (Nd(3+):YAG, 1.06 microns) while samples of Type II can be used for red and shorter infrared (0.8...0.9 microns) region of spectrum. The phase conjugate intensity twice as large as the signal intensity was easily achieved in the red, at lambda = 0.63 microns. It is inevitable that with the same sample and the same refractive index modulation the phase conjugate reflectivity in infrared diminishes as lambda per 2 with the increasing lambda.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 06, 1998
- Accession Number
- ADA353532
Entities
People
- Alexandr N. Shumelyuk
- Konstantin V. Shcherbin
- Serguey G. Odoulov
Organizations
- National Academy of Sciences of Ukraine