Is it necessary to calibrate my SLM? / How do I calibrate my SLM?
For an optimal usage of the SLM, it needs to be calibrated for the used wavelength. The SLM comes with a set of calibration files for different wavelengths depending on the SLM version. Â If the supplied configurations differ slightly from your wavelength used (e.g. you use 530 nm instead of 520 nm mentioned in […]
Can I do amplitude modulation with my phase-only SLM?
You can do amplitude modulation with your phase-only SLM. For amplitude modulation you need to rotate the incident polarization by 45º and use an analyzer after the SLM. As our SLMs are optimized for phase modulation at first, the contrast might not be as good as for our amplitude devices. Also dependent on the used […]
Which incident polarization do I need for phase-only modulation?
Our SLMs are based on liquid crystals, which are anisotropic materials. Therefore, for phase-only modulation you need linear polarization parallel to the director vector of the liquid crystal molecules. For most of HOLOEYE LCOS SLMs the required incident polarization is parallel to the long axis of the display. For few SLM versions it is parallel […]
How can I clean the LCOS display of my SLM?
To clean the LCOS display of a HOLOEYE SLM, first remove the aperture from the top of the display. Make sure to work under antistatic conditions / use ESD protection measures. Use Isopropanol or pure Ethanol and a lab quality cotton swab. Gently wipe of the dirt using low force. Reattach the display aperture afterwords. […]
How do I illuminate the SLM? Which incident angles are acceptable?
Option A Option B Option C Basically there are 3 different options to illuminate the SLM: Option A – Using a polarizing beam splitter: This is the preferred setup for optimal usage of the SLM. Our calibration files are created using normal incidence on the SLM. They have been tested also to maintain a linear […]