1.65μm, 12.5mm Diameter, Infrared Longpass Filter

Product Details Coated on Silicon or Germanium Substrates Ideal for Isolating Broad Spectral Regions Durable, First-Surface Coatings Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team. Infrared (IR) Longpass Filters provide a sharp cut-off below a particular wavelength. Often used for order sorting, they isolate broad regions of the spectrum, simultaneously providing high transmission of desired energy, and deep rejection of unwanted energy. These filters are constructed of hard, durable first-surface dielectric coatings on optical-quality IR-transmitting substrates. Infrared (IR) Longpass Filters are able to withstand normal cleaning and handling associated with any high-quality optical component because of their make-up. These filters are particularly useful for FTIR spectroscopy and Thermal Imaging Applications. For custom sizes and coating requirements, please contact our Sales Department . Specifications General Type: Longpass Filter Note: Transmission at cut-on wavelength is 5% of peak transmission. Physical & Mechanical Properties Diameter (mm): 12.50 +0.0/-0.1 Thickness (mm): 1.00 ±0.2 Parallelism (arcmin): <10 Clear Aperture (%): 90 Optical Properties Optical Density OD (Average): ≥3.0 Cut-On Wavelength (nm): 1,650.00 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Silicon (Si) Coating: Traditional Coated Surface Quality: 80-50 Transmission (%): >85 (average) Transmission Wavelength (nm): 1730 – 3300 Transmission Wavelength (μm): 1.73 – 3.30 Blocking Wavelength Range (nm): 200 – 1650 Slope Factor (%): <7 Cut-On Wavelength (μm): 1.65 ±0.07 Surface Flatness (P-V): 3 - 5λ Environmental & Durability Factors Operating Temperature (°C): -62 to +71 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 253: Compliant ×