Browsing by Author "Yau, HF"

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Elimination of dynamic instabilities in the plus c-face incident photorefractive BaTiO3 mutually pumped phase conjugator
(1999-05-15)
Chang, CC
;
Chen, TC
;
Tang, LC
;
Yau, HF
;
光電工程學系
Experimental observations of the dynamic instabilities in the +c-face incident mutually pumped phase conjugator (MPPC) of a BaTiO3 crystal are reported for the first time. Experiments show that it is possible to stabilize the phase-conjugate output by choosing a proper geometry formed from the crystal and two incident beams. By choosing the proper geometry the essential configuration of the MPPC attained is a "kite" rather than a "fish head". Data also indicate that the phase-conjugate output can reach a very steady state with a high value (similar to 32%) and is insensitive to angular and positional variations.
High-resolution double self-pumped phase conjugations with plus c-face incident configuration in a BaTiO3 crystal
(2000-11-01)
Chen, TC
;
Chang, CC
;
Tang, LC
;
Yau, HF
;
光電工程學系
The geometry of creating two stable self-pumped phase-conjugate outputs in one photorefractive BaTiO3 crystal is demonstrated. This novel geometry provides two phase-conjugate images with a resolution as high as 4 mum (or 114 1p/mm). The reflectivity versus the angle of the incident beam is also investigated.