The LETO phase modulator is based on a reflective LCOS microdisplay with full HD (1920 x 1080 pixel ) resolution. With a pixel pitch of 6.4 µm and a small interpixel gap of 0.2 µm the LETO SLM provides a high fill factor of 93% and thereby a high light efficiency.
HOLOEYE offers three different LETO LCOS Spatial Light Modulator versions which are optimized for the use at different wavelength ranges / for different applications. One SLM version is optimized for the visible range, one version for the near IR range up to 1100 nm and a third version is optimized for fast response (180 Hz) and use for color-field-sequential (CFS) operation in the visible range with color-switchable RGB Laser (different pulse-code programming / calibration is necessary).
The adaptation of the device settings for different operating wavelengths to a linear 2 π phase response can be done by straight forward gamma correction using the supplied Configuration Manager software.
The LETO Spatial Light Modulator offers a reflectivity between 62% up to 75% (dependent on wavelength and version). Due to the optimized design of the LCOS microdisplay the LETO SLM shows low cross talk between the pixels resulting in high effective spatial resolution. The device offers diffraction efficiencies of more than 80% (16 level blazed grating) which leads to a total light efficiency of ~ 60%.
The LETO phase only spatial light modulator devices can simply be addressed like an external monitor using the standard HDMI interface of the graphics card. No additional software or special hardware is needed to operate the SLM.