Skip to main content


Nitto Optical LTD

Company overview

  • Company name: Nitto Optical Co., Ltd.
  • Foundation: October 17, 1955
  • Headquarter: Tokyo, Japan
  • Products: Prisms, Polarizers/Polarizing Prisms, Mirrors, Thin Film Coating
  • Company home page:
Nitto Optical

Product line - Prisms

NITTO OPTICAL is producing various types of Prisms for customers in many different application domain such as aviation/aerospace, semiconductors/LCD lithography equipment, measuring instruments, survey equipment, electro-optical distance meters, laser interferometers, consumer electronics and automotive. In detail these are:

Corner Cube Prisms

Corner Cube Prisms (CCP) are triangular prisms consisted of three right angles of 90 degrees. Reflected beam has a characteristic of inevitably returning in the direction of the incoming optical axis. The accuracy is shown with angular deviation (parallelism) between input and output beams. It depends on the mutual perpendicularity of the trihedral surfaces. Using this characteristic, they are often used in survey equipment. Processing from fused silica as well as optical glass is available upon your request.

  • Hollow Cube Prisms

  • Hollow Cube Prism are constructed of tree first surface mirrors assembled into corner cubes.

Dichroic Prisms

Dichroic Prisms combine R (red), G (green) and B (blue) beams from three directions into one direction.

  • Cross Dichroic Prism (X-cube)

  • Cross Dichroic Prism (X-cube) is combination of 4 triangular prisms. It has function of combining R, G and B three color beams to form the color image. NITTO OPTICAL has a capability for producing various size of X-cubes from 2mm to 60mm and larger for any projectors.

  • Dichroic Prisms - Philips Type

  • Philips Type Prism is used to separate or combine the 3 primary color (RGB) beams.

  • RGB Prism for 3CCD Video Camcorders

  • RGB prism is used for 3 CCD video camcorders

  • Dichroic Prism - Kester Type

  • Kester Type Dichroic Prism is used to separate or combine the RGB beam

Total Internal Reflection Prisms

Total Internal Reflection Prisms (TIR prisms) are used for DLP projectors. These are combined with two triangle prisms.

Triangular Prisms

Triangular Prisms are used for wide optical applications. Two triangular prisms are combined together to act as a beam splitter. They are also used for microscopes, survey equipment and measuring instruments.

  • Right Angle Prism

  • Depending on the usage, the direction of light can be altered 90 or 180 degrees. It also has a function to expand beam according to the angle of incidence.

  • Equilateral Triangle Prism

  • Equilateral Triangle Prism is used in spectral equipment. Incident beam from a certain angle is resolved into each respective wavelength by the refractive index of the prism. Therefore, it is also called Dispersing Prisms.

Micro Prisms

We are specialized in the manufacturing of various different micro-prisms. All sorts of different micro-prisms are customized dedicated to your own purpose and application. Our X-Cube which consists of four pieces of right angle prisms, can be manufactured in the ultra-miniature size down to 2mm cube with almost seamless bonding and, PBS can be made down to 1.0mm cube. Much more complicated ones like TIR prism can also be made in millimeter order.

Penta Prisms

Penta Prisms deviate the input beam by 90 degrees without affecting image orientation. Deviation is independent of prism orientation.

Porro Prisms

Porro Prisms are type of reflection prism used in optical instruments to alter the orientation of an image. These consist of a block of glass shaped as a right geometric prism with right-angled triangular end faces.

Roof Prisms

Roof Prisms are in general kind of reflective optical prisms containing a section where two faces meet at a 90 degree angle. Reflection from the two faces returns an image that is flipped laterally across the axis where the faces meet.

  • Amici Prism

  • Amici Prism is composed of a roof type prism in the bottom of a triangular prism. The image is inverted and reversed, and made upright. Since the optical axis bends by 90 degrees, it is effective in designs for optical systems with a long optical path. By combining several prisms complex optical systems can be simplified.

  • Penta Roof Prism

  • Penta Roof Prism is mainly installed in the viewfinders of single-lens reflex cameras and has the ability to invert and revert images. As a result, it is able to photograph the angle of view as seen through the viewfinder. There are special Penta Roof Prism and Right Angle Penta Roof Prism that give a constant deviation of 90 degrees.

  • Schmidt Prisms

  • Schmidt Prisms is composed of the angle between 45 degrees and 48 degrees between input and output surface. The optical axis is bent 135 degrees, and yet the image can be reversed. The optical axis can be arranged on a line by combining this prism with a supplementary prism and it is used with direct vision binoculars etc.

Dove Prisms

Dove prisms are types of reflected prism which is used to invert an image. Dove prisms are shaped from truncated Right Angle Prism.

Rhomboid Prisms

Rhomboid Prisms are used to displace a laser beam without changing its direction.

Polygon Prisms

Rhomboid Prisms are used to displace a laser beam without changing its direction.

Expander Prism

Beam Shaping Prisms are, in general, used as a beam shaper in laser diodes. The optical axis can be adjusted in a parallel direction by combining two of these prisms.

Wedge Prisms

Wedge prism slightly tilts the angle of an incident beam and adjusts its efficiency. Wedge prism adjusts the aspect ratio of the semiconductor elliptical beam and focuses the beam efficiently.

Product line – Polarizers/Polarizing Prisms

Polarizers/Polarizing Prisms

Beam Splitters

Beam splitters are optical devices that split a beam of light in two. It is the crucial part of most interferometers.

  • Beam Splitter Plate for CD

  • This beam splitter plate is used not only for 780nm wavelength, but for 650nm or 405nm wavelength.

  • 2 Wave Beam Splitter Plate for DVD/CD

  • This beam splitter can be used for dual laser wavelengths (DVDs/CDs ). Transmission and reflection ratio for each wavelength are designed upon your request.

EUV Band Beam Splitter

  • Wavelength 13.5nm
  • Transmission/Reflection ≥30%
  • Divergence Comparison 50%
  • Substrate: Si

Polarizing Beam Splitters

Polarizing Beam Splitter (PBS) divides an incident beam into P and S polarizations. PBS has a function to divide a beam for recording and playing signals in optical pick-up units.

  • Polarizing Beam Splitter Cube for Fiber Optics (1.31μm)

  • Polarizing Beam Splitter (PBS) divides an incident beam into P and S polarizations. PBS has a function to divide a beam for recording and playing signals in optical pick-up units.

  • Polarizing Beam Splitter Cube for Fiber Optics (1.55μm)

  • Polarizing Beam Splitters for Fiber Optics provide isolation with the P-/S-polarization extinction ratio of 1/10,000 or more.

  • Polarizing Beam Splitter Cube for LCOS Projectors

  • This Polarizing Beam Splitter is used especially for high precision LCOS projectors.This beam splitter is made of low photoelastic coefficient glass to avoid heat influence and has low dependency on incident angle.

  • Polarizing Beam Splitter Cube for Blue Laser

  • This Polarizing Beam Splitter Cube was developed specially for Blu-ray Disc, HD DVD applications.

  • Non-adhesive Polarizing Beam Splitter Cube

  • In the latest optical disk technologies (Blu-ray Disc, HD DVD) that use blue diodes, adhesives that have been used without any problems up to now have reached a limit in their reliability due to making luminous wavelengths shorter and the increase in energy density. In NITTO OPTICAL, a beam splitter bonding method with optical contact was developed as a solution for this problem.

Non-polarizing Beam Splitters

Non-polarizing Beam Splitters (NPBS) consist of a pair of precision high tolerance right-angle prisms cemented together with the coating on the hypotenuse of one of the prisms.

  • Non-polarizing Beam Splitter Plate for Measurement/Inspection Instruments

  • Non-polarizing Beam Splitter Cube for Measurement/Inspection Instruments

  • Non-polarizing Beam Splitter Plate for CD-R/RW

  • Non-polarizing Beam Splitter Plate for DVD

  • Non-phase Retardation Beam Splitters

  • Non-phase Retardation Beam Splitter Plate for Blue Laser

Polarizing Converters

Polarizing Converter for LCD projectors divides the incoming random light into P or S polarization in order to increase light efficiency. Either the P or S polarization light passes through 1/2 wave plate and the light is unified to one polarization.

Wave Plates

  • Half-wave Plate

  • Wave plates change the polarization optical path difference that oscillates in a perpendicular direction by 1/2 wavelength.

  • Quarter-wave Plate

  • Wave plates change the polarization optical path difference that oscillates in a perpendicular direction by 1/4 wavelength.

Optical Contact Type (Wave Plate)

Non-adhesive wave plates are ideal for the usage with high power laser. No deterioration of the glue due to the irradiation of high energy density beam at the bonded surface. Excellent performance in both UV and IR bands.

Optical Contact Type (PBS Cube)

Non-adhesive agent bonding method; Ideal for the usage under high power laser (no damage or deterioration of bonded surface due to the adhesive agent), No UV absorption at the bonded surface occur to reduce the transmission.

Wollaston Prisms

Wollaston Prisms comprise two prisms of calcite or crystals cemented together. The ordinary beam in the first half of the prism becomes the extraordinary beam in the second half, and vice versa.

  • Double Wollaston Prism

  • Double Wollaston Prism generates 4 optical fluxes which have 45 degree axis difference among each other. Used as an analyzer of ellipsometric optical systems, this prism acquires Stokes parameter at one time without using polarizing plate. NITTO OPTICAL produces Double Wollaston Prism with calcite.

Nicol Prisms

These are polarizing prisms that comprise two crystals or calcites with double refraction and turn incident beam into linear polarized beam.

Rochon Prisms

Rochon Prisms are used in applications where good polarization selectivity is required across a large range of wavelengths.

Glan-Thompson Prisms

These are polarizing prisms that turn incident beam into linear polarization. The incident beam polarization becomes perpendicular to the output surface.

Product line – Mirrors

Bar Mirrors

Bar Mirrors are used for the control system in the X-Y stage of lithography equipment. The performance of the X-Y stage determines the required accuracy for the bar mirror. High-precision Bar mirrors show excellent performance. NITTO OPTICAL provides bar mirrors in various sizes and wide selection of materials such as ceramics.
NITTO OPTICAL guarantees the surface flatness below λ using the ZYGO 32"(Φ800) Interferometer and the ZYGO 12" (Φ300) Interferometer

Size: from 100mm to over 3,500mm.
Surface Flatness from several μm level to λ or less.
Please contact us for details about specifications. (Materials, Shape, Surface Flatness, etc.)

  • Ultra Long Bar Mirror

  • The ultra-long bar mirror rages from 2,500mm to over 3,000 mm in length. Nitto Optical is establishing technology for longer sizes

  • Ultra Low Expansion Glass-ceramic Bar Mirror

  • Quartz Bar Mirror

  • Ceramics Bar Mirror

  • SiC Ceramic Bar Mirror

  • L-shaped Mirrors

  • Polygon Mirrors

  • Polygon Mirrors are rotating polyhedron mirrors with flat reflecting surfaces on the perimeter.

  • Ring Laser Gyroscope Mirrors

  • Ring Laser Gyroscope Mirrors are used for an optical gyrocompass element.

  • Low Scattering Mirrors

  • The high reflectance is achieved by suppressing the loss and scattering of the incident light occurred at the mirror surface. Ion beam spattering coating method makes it possible to form such mirror.

Competitive Advantage

The competitive advantage lies in their integrated production system with high-precision polishing and high-performance coating capabilities combined with their total quality assurance system. On top Nitto Optical is capable to deliver ultra-small to as well as large size optics and can scale their production from small lot size to large volume mass production.

If you have any request, please contact us through our contact page.


  • Automotive
  • Communications
  • Healthcare / Medical
  • Instrumentation
  • Industrial / Factory Automation
  • Automotive