Products>>IR Optical Filters

Infrared (IR) Bandpass Filters, Custom Optical Interference Filters

Alkor Technologies can design and fabricate custom infrared bandpass filters to suit your particular requirements. Every phase of the process is performed in-house, including thin-film coating design, mechanical design, substrate fabrication and polishing, coating, inspection.

  • Ideal for Gas Analysis
  • Center Wavelengths of 2.0-12.0μm
  • Single Substrate Interference Filter

Developed with durability in mind, our Infrared (IR) Bandpass Filters provide the high transmission and deep rejection needed to isolate narrow spectral regions. The single substrate dielectric construction ensures easy maintenance, allowing for use in harsh environments. Infrared (IR) Bandpass Filters are ideal for environmental monitoring, security and FLIR applications.

Bandpass interference filters are used extensively in a variety of biotech, biomedical, and chemical applications to selectively transmit a narrow range of wavelengths while blocking all others. Interference filters are widely used in instrumentation for applications including clinical chemistry, environmental testing, colorimetry, elemental and laser line separation, flame photometry, fluorescence.

We can coat a variety of substrate materials, including Germanium, Sapphire, Silicon, Zinc Sulfide, and Zinc Selenide.

Contact us today with your custom IR filter specifications!

1. IR Long wave pass filters, (LWP)

Cut-off filter

Longwave pass filters (IR) are designed to transmit wavelengths longer than 5% of the "cut-on" values and block the shorter wavelengths. The longwave pass filters (IR) are optimized for zero degree angle of incidence. The inband transmission is typically above 75% and the average out-of-band blocking is less than 0.1%.

Custom sizes longwave pass filters and wavelengths are available upon request.

2. IR shortwave pass filters (SWP)

Cut-off filter

Shortwave pass filters (IR) are designed to transmit wavelengths shorter than 5% of the "cut-off" values and block the longer wavelengths. The shortwave pass filters (IR) are optimized for zero degree angle of incidence. The inband transmission is typically above 75% and the average out-of-band blocking is less than 0.1%.

Custom sizes shortwave pass filters and wavelengths are available upon request.

3. Infrared Narrow bandpass filters

Narrow band filter

IR Narrow bandpass filters for 3.06 and 3.4microns

Infrared narrow bandpass filters are designed to transmit the incident radiation in a narrow band and block all other wavelengths in IR band. Infrared narrow bandpass filters provide high transmission in specified wavelength regions and extremely high rejection outside the band. Bandpass center wavelengths can be located anywhere in the region from 2 μm to 12 μm. Filter designs are available on a variety of infrared transmitting substrates.

Custom sizes infrared narrow bandpass filters are available upon request.

IR Narrow band filter for 7.73microns

4. Custom IR Broad Bandpass filters

The Wide Bandpass filters have a bandwidth at half peak transmission that can be selected to suit your particular application. The only restriction is that the bandwidth must be kept within the bands indicated by the HWmax and HWmin.

Custom Wide bandpass filters are available with greater average transmission than 70% upon special request. 

Custom sizes IR Broad Bandpass are available upon request.

Broadband filter

Infrared Broad bandpass filter on Si substrate

Broadband filter

Infrared Broad bandpass filter on Germanium substrate

All transmission curves are given as examples. We make custom solution IR filters by your specifications. Transmission and refelection measured on IR Fourie spectrometer FSM1201.

Optical Infrared Broad Bandpass Filters are angular sensitive, so care should be taken when mounting or integrating into an optical system.

Contact our Sales Team to buy IR optical filters at reasonable price!