High Quality UV Metal Coated Neutral Density (ND) Filter, Φ25mm, OD=0.6, United Optical Technology Co., Ltd (CAT#: STEM-OP-4055-YJL)

High Quality UV Metal Coated Neutral Density (ND) Filter, Φ25mm, OD=0.6, model 248516, is manufactured by United Optical Technology Co., Ltd.
High quality UV Metal coated Neutral Density (ND) Filter, also known as neutral density filter, neutral filter, ND filter, attenuation filter, fixed density filter, etc.
Metal coating: broadband use, uniform wavelength attenuation, low power consumption. It can be used in optical imaging systems, smoke meters, optical measuring instruments, near-infrared spectrometers, biochemical analysis equipment, etc.

Diameter: Φ25mm
Optical Density OD: 0.6
Design Wavelength: 300nm
Material: UV Fused Silica
Transmitted Wavefront Error: λ/4@633nm
Parallelism: ＜30arcsec
Surface Quality: 20/10-40/20
Diameter Tolerance: +0.0/-0.1mm
Thickness: 2mm±0.2mm
Applied Wavelength Range: 200~1200nm
Transmission(T): 0.25
Optical Density Tolerance: ±5%@300nm
Clear Aperture: ＞90%
Optical Density (OD): OD=-log(T/100)

ND filters reflect the portion of light that is not transmitted, uniformly reducing transmission in a portion of the spectrum. Reflective neutral density filters use the principle of thin film interference to transmit part of the light and reflect the other part.

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