Light utilization efficiency is defined as the ratio of the average reflected light intensity (Iave) to the incident light intensity (Ipow) when an LCOS-SLM is driven with a supply voltage ranging from 1 V to the maximum voltage (Vhigh).
Light utilization efficiency = Iave / Ipow [%]
Using a phase modulation optical system as shown in the figure where the polarization direction of the incident light is aligned with the orientation of the liquid crystal molecules, the reflected light intensity is measured at each supply voltage ranging from 1 V to the maximum voltage which is divided into 128 points. The incident angle (θ) is set within 10 degrees and the aperture size is set to 6 mm in diameter.
Measurement setup for light utilization efficiency
The table below shows the average light utilization efficiency for each of our LCOS-SLM types. Two or more light sources were used for measurement by the wide wavelength band type. The specific wavelength type delivers a high light utilization efficiency that exceeds 95 % and the wide wavelength band type offers 76 % to 86 %. The light loss is mainly caused by generation of diffracted light resulting from the pixel structure, scattering light in the liquid crystal layer, and absorption by the transparent electrode.
Type No. |
Wide wavelength band type |
Specific wavelength type |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
-01 |
-07 |
-08 |
-02 |
-03B |
-05 |
-12 |
-13 |
-15 |
-16 |
-19 |
|
Wavelength of light source (nm) |
633 |
1064 |
1550 |
785 |
1064 |
405 |
940 |
532 |
1550 |
532 |
1950 |
Light utilization efficiency (%) |
76 |
80 |
86 |
97 |
97 |
97 |
97 |
97 |
97 |
97 |
97 |
Type No. |
High-power laser type |
Laser metal processing type |
|||||
---|---|---|---|---|---|---|---|
-02L/-02R |
-03BL/-03BR |
-12L/-12R |
-15L/-15R |
-16L/-16R |
-19L/-19R |
-03CL/-03CR |
|
Wavelength of light source (nm) |
785 |
1064 |
940 |
1550 |
532 |
1950 |
1064 |
Light utilization efficiency (%) |
97 |
97 | 97 | 97 | 97 | 97 | 97 |
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