It is a product with lower quality than DLB series with low surface spherical achromatic lens.

Allowed to use optical system, which is not required high surface quality imaging lens such as the microscope lens and telescope lens.

• Specification except surface quality is almost the same as DLB series. Except when used in high-precision experiment using a laser, this lens is recommended.
• It is optimized so that focal length gap is small in the visible light range and the aberration is minimized.
• It is also corrected for astigmatism and comatic aberration of off-axis as well as aberration of axial object point.

For an illumination optical system and a simple experiment, it is not requested the low-scratch polishing for a laser. Reflectance and surface flatness is the same as aluminum mirrors (TFA) for a laser.

• The dirt on the surface of the mirror can be wiped because the scratch-resistant protection is coated on the aluminum coating.
• Reflectance of less variation can be obtained in a wide wavelength range from visible to near-infrared.

For the illumination optical system and a simple experiment, it is the glass substrate of which high surface quality used for the optical element is not required. Surface accuracy and parallelism (tolerance of wedged) is the same as optical flats for a laser.

• It is also available for manufacturing with a coating as requested to the plane substrate.
• In additional to the circle, square type, rectangular type of planar substrate, it is also available a wedge substrate and the parallel planar substreae which has high surface accuracy of both side.

Sigma Koki

It is the product that was reduced by one rank from the surface quality of Plano Concave Lens (SLB-N). It can be use in an optical system such as observation or lighting applications that high surface quality is not required.

• It has the same specification of Plano Concave Lens (SLB-N) except the surface quality. Unless a laser is used for high-precision experiments, it is recommended.
• There are two types of lens. One is a Plano Concave Lens with low spherical aberration and the other is a biconcave lens that is possible to shorten the focal length by a large refraction.
• In addition to uncoated products, there are three types of anti-reflection coating for visible, near-infrared, and infrared.

Sigma Koki

It is the product that was reduced by one rank from the surface quality of Plano Convex Lens (SLB-P). It can be used in an optical system such as observation or lighting applications that high surface quality is not required.

• IT has the same specification of Plano Convex Lens (SLB-P) except the surface quality. Unless a laser is used for high-precision experiments, it is recommended.
• There are two types of lens. One is a Plano convex lens with low spherical aberration and the other is a biconvex lens that is possible to shorten the focal length by a large refraction.
• In addition to uncoated products, there are three types of anti-reflection coating for visible, near-infrared, and infrared.

F-Theta Lens converts rotational movement of a galvanometer mirror into a linear motion on a focal plane by utilizing distortion effects. Used for Laser Marking, Bar code Reader and Laser Micro machining industry and so on.