Sigma Koki. 

Sigmakoki Co., Ltd., through its subsidiaries, is a Japanese supplier of diverse optical instruments and related products. The company's offerings span foundational opto-mechanical components and manual positioning equipment, such as stages, holders, mounting bases, support rods, poles, clamps, and modular cage systems. They also provide an extensive array of optical elements and coatings, including multi-element optics, mirrors, beam splitters, filters, lenses, prisms, polarizers, various types of crystals (laser and nonlinear), substrates, and protective windows. Additionally, Sigmakoki develops advanced motion control systems, featuring automated positioning devices, precise optical measurement instruments, and specialized software for control and analysis. Their laser product line includes optical modules, integrated lens units, laser processing machinery, and a variety of laser application solutions. The company's portfolio extends to the biomedical sector with products like micromanipulation systems, motorized microscope stages, core units for microscopy, and other bio-medical devices. Furthermore, Sigmakoki crafts specialized optical application systems, such as optical fiber alignment solutions, observation systems, and custom-designed products under contract. Established in 1977, Sigmakoki Co., Ltd. is headquartered in Hidaka, Japan.