Title :
Electro-Optic Raman–Nath Modulator Using Cascaded Periodically Poled Gratings
Author :
Okazaki, Masahide ; Suhara, Toshiaki
Author_Institution :
R&D Center, Dainippon Screen Manuf. Co., Ltd., Kyoto, Japan
Abstract :
We propose a new type of electro-optic modulator consisting of cascaded periodically poled Raman-Nath gratings as a building block of a 1-D spatial light modulator with a wide acceptance angle. The modulator has two grating stages of harmonic periods for an enhancement of extinction ratio. The device was designed through the beam propagation method simulation, and fabricated in MgO:LiNbO3. An extinction ratio >50 was accomplished at ~150 V driving voltage.
Keywords :
diffraction gratings; electro-optical modulation; extinction coefficients; lithium compounds; magnesium compounds; optical design techniques; optical fabrication; optical materials; spatial light modulators; 1-D spatial light modulator; LiNbO3:MgO; beam propagation method simulation; building block; cascaded periodically poled Raman-Nath gratings; electro-optic Raman-Nath modulator; extinction ratio enhancement; grating stages; harmonic periods; wide acceptance angle; Crystals; Diffraction; Extinction ratio; Gratings; Laser beams; Measurement by laser beam; Modulation; MgO:LiNbO3; Raman-Nath diffraction; beam propagation method; electro-optic device; optical modulator; periodically-poled structure;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2355913
