2014•Optics ExpressOpen access

Stable and flexible multiple spot pattern generation using LCOS spatial light modulator

Naoya Matsumoto, Haruyasu Itoh, Takashi Inoue, Tomoko Otsu, Haruyoshi Toyoda

Abstract

The LCOS spatial light modulator (LCOS-SLM) can generate desired multiple spot patterns (MSPs) via the application of suitable computer-generated-holograms (CGHs), but the MSP intensity distribution varies because ambient temperature affects the phase modulation characteristic and causes wavefront distortion. To generate high-optical-quality MSPs we use our hardware-compensated (with a Peltier system to even out phase modulation) and software-corrected (via multiplication of the CGH by temperature correction coefficients) LCOS-SLMs. Experimental results with a 14 × 14 MSP generation show that the hardware-compensated LCOS-SLM provides stable MSPs between 9 to 32 °C. The software-corrected LCOS-SLM provides uniform spots over twice the temperature range obtained with conventional SLM method. We confirm that our methods are highly efficient for use in two-photon excitation microscopy application such as multifocal mulitphoton microscopy.

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Available abstract

Key concepts: Liquid crystal on silicon, Spatial light modulator, Optics, Wavefront, Materials science, Holography, Modulation (music), Distortion (music)