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Characteristics | LCOS-SLM (optical phase modulator) X15213 series
High light utilization efficiency
The X15213 series have high light utilization efficiency, which is defined as the ratio of the 0th order diffraction light intensity to the input light intensity. The light utilization efficiency mainly depends on the reflectivity of the mirror, and the amount of diffraction loss caused by the pixel structure. We adopted advanced CMOS technology to make the diffraction loss smaller. As a result, the diffraction loss is less than 5 %. In particular, the -02/-03/-05/-12/-13/-15/-16/-19 types have very high light utilization efficiency thanks to the highly reflective dielectric mirror.
High linear phase modulation characteristics
The X15213 series can achieve phase modulation of more than 2 π radians over the 400 nm to 2050 nm readout wavelength range. Prior to shipment, each type is pre-calibrated at the factory to obtain high-precision and high-linear modulation characteristics for a specific wavelength range. Figure 5 shows typical phase modulation characteristics. A phase shift of 2 π radians or more and a linear phase response are achieved. The phase modulation curve of 95 % of the pixels in the effective area is within +/- 2 σ, which indicates that the variation is so small.
[Figure 1] Phase modulation (typical example)
High diffraction efficiency
The X15213 series is a pure phase SLM with high precision phase control; therefore, it has high diffraction efficiency close to the theoretical values. Figure 2 shows images of diffracted spots when a multi-level phase grating is displayed on the X15213 series, and Figure 3 shows typical diffraction efficiency characteristics. Here, the diffraction efficiency is defined as I1/I0, where I1 is the intensity of the 1st order diffraction spot, I0 is the intensity of the 0th order light when no pattern is displayed.
[Figure 2] Diffracted spots images
[Figure 3] Diffraction efficiency (typical example)
Output Images examples
The X15213 series has high precision phase control and high diffraction efficiency, and is very suitable for holographic applications.
Figure 4 (a) is a interferometer picture of the output wavefront with a flatness calibration.
The image in Figure 4(b) was reconstructed as the 1st diffraction order of the phase hologram through the Fourier transform optics. Figure 4(c) shows a clear Laguerre Gaussian (LG) beam of (0, 1) order.
[Figure 4] Output image examples
Patents
LCOS-SLM includes the following patents license. Please consult us for other patents.
Japan
JP4420672, JP4664031, JP4947639, JP4551363, JP4606831, JP5046331,
JP5167274, JP5270142, JP5779359, JP5779360, JP5809420
USA
US7209279, US7527201, US7876405, US8576206, US8749463, US9007286, US9223159,
US9250458, US9250459
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