In this paper, we introduced our research and development progress on phase-only spatial light modulator (SLM), and our key liquid crystal on silicon (LCOS) technologies to realize it. Based on these technologies, which have achieved high image quality with world-class contrast, we detailed how phase-only SLMs can benefit a wide range of application scenarios such as holographic displays, image projection devices, and other infrared applications.
We developed compact phase-only spatial light modulator (SLM) having 1920 × 1080 pixels with pixel pitch of 4.25 μm on the basis of liquid crystal on silicon (LCOS) technologies. Our SLM can downsize optical systems on various applications because of the compactness of the panel and wide diffraction angle realized by the small pixel pitch. In addition, we realized high photostability by using inorganic alignment layers and light shielding layers for transistors. SLMs for visible light and infrared light are developed assuming display applications and industrial applications, respectively. In this paper, we will introduce our LCOS technologies used in the prototype of phase-only SLM and application researches such as illuminator and laser soldering.
Comprehensive overview of design requirements and issues in the development of phase-only spatial light modulator (SLM) based liquid crystal on silicon (LCOS) technologies is presented. Phase-only SLMs enable many applications such as holographic three-dimensional (3D) displays, head-up displays for automobiles, laser processing, 3D printers, optical communication, and optical computing. Our LCOS panel can achieve high image quality represented by world-class high contrast ratio. In addition, our LCOS has high reflectivity, high-definition pixels, and high durability against high-power light. In phase-only SLM, high reflectivity means high light use efficiency, high-definition pixels achieve wide-diffraction angle, and high durability against light enables use of high-power laser. In this presentation, we will report a development of phase-only SLM based on LCOS technologies and promising candidates of applications using our phase-only SLM.
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