Features
An infrared filter is a filter that transmits the infrared region.
The infrared region is broadly divided into three regions: the near infrared region (NIR) of the roughly 0.7 to 2.5 μm band, the mid-infrared region (MIR) of the 2.5 to 25 μm band, and the far infrared region (FIR) of the 25 to 1,000 μm band.
Infrared rays are used in a very wide range of applications, from crime prevention to astronomical observation and sensors.
In the mid-infrared region in particular, we have transparent substrate materials with a high refractive index and can produce multi-layer interference filters with various characteristics as we can obtain a wider range of cutoff characteristics than in the visible region using spectral absorption.
High refractive index substrate materials include quartz, sapphire, Si, Ge, chalcogenide, etc., and the material to be used can be selected in consideration of the required spectral characteristics and durability.
In addition, we can not only produce filters that allow light to pass through, but also mirrors that reflect the above areas.
Applications
Various gas analysis (CO2, CO, HC, NOx, SOx, O3 gas, etc.), surface measurement, radiation thermometer (thermography and temperature sensors), diffraction grating high-order cut filters, human sensors, other optical systems and cameras using infrared rays, etc.
Example characteristics
These are the general spectral characteristics of anti-reflection coating, edge filters (LPF) and interference filters (BPF) in the mid-infrared region.
This is an example of a filter that achieves high transmittance in the above area.
Features
We can produce highly durable anti-reflection films with DLC coating (hard carbon film; diamond-like carbon).
The company’s unique coating using a plasma CVD method combines two features: high transmittance rates and high durability in the mid-infrared region (MIR).
We can coat Ge, Si, quartz, glass, chalcogenide and other substrate materials.
In addition, we can work not only with flat plates, but also lens materials, so please consult with us about your needs.
Applications
Infrared image element windows, combined lens for optical systems using infrared, window material for CO2 laser processing machine, etc.
Example characteristics
High transmittance rate
DLC is transparent in the mid-infrared region (MIR) so we can obtain anti-reflection film with high transmittance for Ge and Si substrates.
High durability
We can obtain a film surface with high hardness and excellent wear resistance for use as a protective film on the outermost layer.
In addition, it also has excellent moisture and salt water resistance.
Humidity resistance: 85・C / 85%Rh 600Hr
Peeling resistance: MIL-C-48497A 4.5.3.1
Salt water resistance: 85・C / 5wt% / 24Hrs
Maximum filmable size: φ400
