Title :
Coherent oscillation in photorefractive crystal with two types of movable charge species
Author :
Odoulov, S. ; Shumelyuk, A. ; Brost, G.
Author_Institution :
Inst. of Phys., Acad. of Sci., Kiev, Ukraine
Abstract :
Summary form only given. Tin hypothiodiphosphate (Sn/sub 2/P/sub 2/S/sub 6/) is a promising photorefractive material for red and near-infrared spectral range with the gain factor more than 10 cm/sup -1/ and the millisecond response time. We report on particular behaviour of the coherent ring-loop oscillator with this crystal pumped by He-Ne laser. With no special measures the oscillation occurs with two roughly symmetric temporal frequencies and therefore the output oscillation wave exhibits the high contrast intensity modulation. The reason of this unusual feature is in special shape of the gain spectrum itself, typical for the crystals with two out-of-phase photorefractive gratings formed by the charge carriers of different sign.
Keywords :
carrier mobility; diffraction gratings; infrared spectra; optical pumping; photorefractive materials; tin compounds; He-Ne; He-Ne laser; Sn/sub 2/P/sub 2/S/sub 6/; charge carriers; coherent oscillation; coherent ring-loop oscillator; gain factor; gain spectrum; high contrast intensity modulation; millisecond response time; movable charge species; near-infrared spectral range; out-of-phase photorefractive gratings; output oscillation wave; photorefractive crystal; photorefractive material; roughly symmetric temporal frequencies; tin hypothiodiphosphate; Delay; Frequency measurement; Intensity modulation; Laser excitation; Photorefractive materials; Pump lasers; Ring lasers; Ring oscillators; Shape; Tin;
Conference_Titel :
Lasers and Electro-Optics, 1999. CLEO '99. Summaries of Papers Presented at the Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-595-1
DOI :
10.1109/CLEO.1999.834185
