High efficiency multiple beam gratings
Abstract
Diffraction gratings are used in many optical systems - including shearing interferometers, multiple imaging devices, and some optical video players - to divide one wavefront into many wavefronts. High diffraction efficiency is obtained by using phase gratings. The paper discusses optimization of the efficiency of phase grating, with particular attention to the applications of pulse width modulation (PWM) and pulse position modulation (PPM) for producing multiple beam diffraction grating. Both modulation techniques are intended to create grating structures that produce uniform central diffracted beams. By using these techniques and proper phase relief for the grating, diffraction efficiency of 70% or more can be attained. Some examples of multiple beam diffraction gratings are discussed.
- Publication:
-
Applied Optics
- Pub Date:
- July 1979
- DOI:
- 10.1364/AO.18.002152
- Bibcode:
- 1979ApOpt..18.2152L
- Keywords:
-
- Gratings (Spectra);
- Light Beams;
- Light Modulation;
- Optical Communication;
- Pulse Communication;
- Transmission Efficiency;
- Optimization;
- Pulse Duration Modulation;
- Pulse Position Modulation;
- Systems Engineering;
- Wave Diffraction;
- Optics;
- HOLOGRAPHY;
- IMAGE PROCESSING;
- GRATINGS