The Diffraction Grating is a reflecting or transparent element, whose optical properties are periodically modulated. Most commonly the diffraction gratings are realized as fine parallel and equally spaced grooves or rulings on material surface. When light is incident on a diffraction grating, diffractive and mutual interference effects occur, and light is reflected or transmitted in discrete directions, called diffraction orders.

Etalons are typically made of a transparent plate with two reflecting surfaces, or two parallel highly-reflecting mirrors. These transmission spectrums as a function of wavelength exhibit peaks of large transmission corresponding to resonances of the etalon. NITTO OPTICAL produces optical elements compatible with KrF/ArF lasers.

Fabry-perot Etalon is an optical element that has multiple reflections. Two parallel high reflectance planes (optical flat) are set by specific spacers in parallel. A reflection coating corresponding to the wavelength is deposited on the reflecting surface. It is used for fiber optics in narrow-band filters and semiconductor lithography equipment such as excimer lasers, etc.

This is a high-precision parallel plate type Etalon. It is used for DFB laser wavelength lockers for Fiber Optics. High finesse characteristics in Free Spectral Range (FSR) are achieved by high precision technology of controlling thickness, parallelism, and surface flatness.

High heat resistance Polyimide materials are used for multi-layer filter substrates. Ultra-thin filter can be produced with the Polyimide substrate thickness of 6-10µm.

Substrateless Filters are used for multi-layer filters. Filters with no optical coupling loss can be manufactured.

NITTO OPTICAL provides high-precision substrates which are essential for photomasks in photoetching.

• Substrate: Low expansion glass
• Surface Roughness =  3Å or less (Current)
  * Target <1.5Å
• Flatness Level = 63nm or less (Current)
  * Target <50 nm
• Parallelism = 61.8nm or less (Current)
  * Target <50 nm.

High-precision polishing and coating process (AR) can be done for various crystals. The Wavelength Conversion Crystal Elements have excellent laser power durability.

CaF2 (Calcium fluoride) has high broadband transmission characteristics and shows superb transmission performance from the ultraviolet to infrared optical range.
Taking advantage of these characteristics, NITTO OPTICAL provides CaF2 optics for specific wavelength bandwidths.

Blue or bluish-violet LD and LED are being marketed. In these products, a problem of decreasing luminous efficiency can be seen because the window material (resin) is damaged by the high-energy of shorter wavelength beam.
To solve this problem, NITTO OPTICAL introduces optical windows made of CaF2 material as highly reliable beam emitting/receiving elements.

Cylindrical means a lens which one of the surfaces is curved in one meridian and less curved in the opposite meridian.

• Form Accuracy = λ/10
• Roughness Accuracy = 0.3 nm or less (RMS)
• Size = Diameter 200mm or less
• Shape = Aspheric

We manufacture cantilevers used for magnetic force microscopy (MFM). Our original thin film deposition technology achieves high coercivity.
• Coercivity: 10kOe or higher

This MLA product can only be made either with Fused Silica or Silicon(Si) materials. Fused silica has excellent heat resistance and has also good characteristics for UV (ie. i-line) bands. Silicon has advantage over light bands for optical communication and that over IR due to its high refractive index.

Inquiry :
Please kindly inform us your requirements and applications.

Optical design :
We propose the best optical design according to your purposes and applications.

Layout and mechanical design :
We propose module structure and mechanical design after the optical design is decided.

We will not only manufacture optical parts, such as lens, prisms, filters etc., but also assemble components.
We are happy to accept orders from prototype to mass production.