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| LCOS Features |
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Light utilization efficiency
The X10468 series have high light utilization efficiency, which is defined a ratio of the 0th order diffraction light intensity to the input light intensity. The high light utilization efficiency mainly depends on reflectivity, and the amount of diffraction loss caused by the pixel structure. We adopted advanced CMOS technology to make diffraction loss smaller. As a result, the diffraction loss is less than 5 %. The X10468-2/-03/-04/-05 have a dielectric mirror which has high reflectivity. Therefore, these types have very high light utilization efficiency about 90 %. The X10468-01/-07/-08 have relatively low light utilization efficiency about 72 % compared to the ones with dielectric mirror but have wide spectral response characteristic.
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Phase Modulation
The X10468 series can achieve phase modulation of more than 2 π radians over the 400-1550 nm readout wavelength range. The X10468 series comes pre-calibrated from the factory for a specified wavelength range to have more than 2 π radians of phase modulation and its linear characteristics. Figure 2 shows typical phase modulation characteristics. A phase shift of 2 π radians or more and a linear phase response are achieved. The phase modulation curves for 95 % pixels lies within +/- 2 s. |
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Diffraction efficiency
The X10468 series is a pure phase SLM with high precision phase control; therefore, it has high diffraction efficiency close to the theoretical values. Figure 3 shows images of diffracted spots, when a multi-level phase grating is formed in the X10468 and Figure 4 shows typical diffraction efficiency characteristics. Here, diffraction efficiency is defined I1/I0, I1 is intensity of the 1st order diffraction spot, I0 is the intensity of the 0th order light when no pattern is displayed. |
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Output Images
The X10468 series with its high-precision phase control and high diffraction efficiency is very suitable for holographic applications. Figure 5 shows several examples of output images: (a) an interferometer picture of output wavefront with a flatness calibration; (b) a reconstructed image using the 1st diffraction order of the kinoform through Fourier transform optics; (c) a Laguerre Gaussian (LG) beam of (0, 1) order.
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