Phase Modulation – Optical Principle of a FLCoS SLM

The birefringence of the liquid crystal material introduces a phase delay, allowing the FLCoS to be employed as a Spatial Light Modulator (SLM), operating as a high speed binary (0 or π ) phase modulator of coherent light from a laser. Using the QXGA-3DM, diffraction into the 1st order can be modulated up to 4.5 kHz by fully reconfigurable high resolution grating patterns.

The diffraction efficiency into the first order at room temperature is

  • 10% at 544 nm
  • 8% at 455 nm

More details can be found in the short tutorial below:
Certification PDF

ForthDD – Binary Phase Mode Webtutorial