Characteristics | Specific wavelength type

High light utilization efficiency

LCOS-SLM features high light utilization efficiency which is expressed as the ratio of the 0th-order diffraction light intensity to the incident light intensity. This light utilization efficiency mainly depends on the diffraction loss resulting from the pixel structure and reflectivity of the mirror formed on the CMOS chip. We have minimized the diffraction loss to below 5% by leveraging our advanced CMOS technology while paying careful attention to its design. The specific wavelength type has a dielectric multilayer film formed on the pixel electrodes that act as a mirror with enhanced reflectivity. This reduces the absorption of light inside the LCOS chip, achieving very high light utilization efficiency.

Type No.

Specific wavelength type 

-02

-03B

-05

-12

-13

-15

-16

-19

Wavelength of light source (nm)

785

1064

405

940

532

1550

532

1950

Light utilization efficiency (%)

97

97

97

97

97

97

97

97

Large phase modulation characteristics and high linearity

Our LCOS-SLM provides phase modulation of more than 2π radians over the supported wavelength range. Each type is adjusted prior to shipment to ensure high-precision and highly linear modulation characteristics for a specific wavelength range. Figure 1 shows typical phase modulation characteristics. As can be seen, phase modulation of 2π radians or more is obtained with high linearity. We also confirmed that the phase modulation for 95% of the pixels in the effective area is within ±2σ, indicating only small variations.

Figure 1: Phase modulation characteristics (typical example)

High diffraction efficiency

Due to the optical design optimized to minimize light loss, our LCOS-SLM delivers high diffraction efficiency close to the theoretical values. Figure 2 shows diffraction spot images obtained when multi-level phase gratings are displayed. Using a multi-level phase grating makes it possible to concentrate the diffraction spot only at the +1st order, for example as shown in Figure 2 (c), achieving a high light utilization efficiency. Figure 3 also shows typical diffraction efficiencies. The diffraction efficiency here is the ratio of the 1st-order diffraction light intensity to the 0th-order light intensity when no modulation is performed (no pattern is displayed).

Figure 2: Diffraction spot images

Figure 3: Diffraction efficiencies (typical examples)

Contact us for more information.

  • Literature
  • Price
  • Delivery
  • Custom order
  • Support
  • Other

Contact us