Longpass Coloured Glass Filter, Φ50mm, Red, CWL: 665nm, United Optical Technology Co., Ltd (CAT#: STEM-OP-4224-YJL)

Longpass Coloured Glass Filter, Φ50mm, Red, CWL: 665nm, model 259063, is manufactured by United Optical Technology Co., Ltd.
Longpass Colored Glass Filter refers to adding special elements during the glass melting process, thereby absorbing different spectral bands and transmitting other spectral bands.
Precautions for use: Please wear finger cots when using, and do not touch the surface of the shortwave filter directly with your fingers to prevent residual fingerprints from affecting the light-passing effect of the shortwave filter. If the surface of the shortwave filter is dirty, use dust-free lens cleaning paper dipped in alcohol to wipe the lens surface. Do not wipe with cloth or paper with a very rough surface or water, otherwise the surface of the shortwave filter will be damaged.

Diameter: Φ50mm
CWL: 665nm
Filter Color: Red
Material: Coloured glass
Glass Model: RG665
Surface Accuracy: λ/2@633nm(25mm Area)
Parallelism: ＜1arcmin
Surface Quality: 40/20-60/40
Diameter Tolerance: +0.0/-0.2mm
Thickness: 2mm±0.2mm
Central Wavelength Tolerance: ±10nm
Transmission(T): Tavg＞85%

Due to the inherent absorption or transmission characteristics of the material, compared to dielectric coating filters, the center wavelength of colored glass filters will not change for light beams incident at different incident angles. Colored glass filters are extremely durable.

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