Electro-optic device for optical signal processing at high repet

Details Electro-optic device for optical signal processing at high repet Electro-optic device for optical signal processing at high repet

1990-04-19

1991-12-24

Hille, Rolf

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359246, 359257, 359285, G02F 101

Patent

active

050757954

ABSTRACT:
An electro-optic device, which processes by modulating, switching or gating, a light beam in response to an electrical signal utilizes an electro-optic crystal through which the beam to be processed passes. An electric field is generated by pulses which modulate the crystal's index of refraction and also causes piezoelectric ringing in the crystal. Acoustic energy absorbing material is coupled to the crystal for absorbing the piezoelectrically generated acoustic waves propagating perpendicularly to the applied electric field direction which has been found to be the dominant acoustic mode affecting the birefringence of the crystal and causing the ringing. The field is applied in short pulses (of the order of 10 nsec or less) thereby reducing lower frequencies in the acoustic energy spectrum thereby facilitating the absorption of the ringing energy. The modulation or gating of the optical beam may be carried out at high repetition rates which have heretofore limited the use of electro-optic devices to repetition rates of approximately 1 KHz or less.

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