Ultrasteep Longpass Filter, Φ25mm, Laser Wavelength=785nm, United Optical Technology Co., Ltd (CAT#: STEM-OP-3804-YJL)

Ultrasteep Longpass Filter, Φ25mm, Laser Wavelength=785nm, model 208701, is manufactured by United Optical Technology Co., Ltd.
Ultrasteep Long Pass Filter allows light with a wavelength larger than the set wavelength to pass through and cuts off light with a wavelength smaller than the set wavelength.
United Optical Technology has launched ultra-steep long-pass filter standard products with diameters of 12.5mm and 25mm in packaged and unpackaged versions and wavelengths of 488nm-1064nm laser wavelengths.
The arrow on the mounting ring of this filter indicates the preferred direction of light propagation. If the filter surface is dirty, use dust-free lens cleaning paper dipped in alcohol to wipe the lens surface. Do not use cloth or paper with a very rough surface or water to wipe it, otherwise it will damage the surface.

Diameter: Φ25mm
Laser Wavelength: 785nm
Transmission Band: Tavg＞93%@790.1-1770.7 nm
Edge Wavelength: 786.7nm
Blocking Band 1: ODabs＞6@785 nm
Blocking Band 2: ODavg＞6@638-785 nm (typical)
Transition Width (1): 3.9nm
Transition Width (2): 63cm^-1
Edge Steepness: 0.002
Edge Steepness (1): 1.6nm
Edge Steepness (2): 25.4cm^-1
Material: UV Fused Silica
Diameter Tolerance: +0.0/-0.1mm
Mount Thickness: 3.5mm
Substrate Thickness: 2.0mm
Thickness Tolerance: ±0.1mm
Surface Quality: 60-40
AOI: 0±2°
Clear Aperture: ≥22mm
Laser Damage Threshold: 0.5J/cm2@266nm (10ns pulse width); 1J/cm2@532nm (10ns pulse width)
Note: Arrow on ring indicates preferred direction of propagation of light.

This filter has the characteristics of high laser damage threshold, deep cut-off depth, and ultra-steep transition from reflection to transmission. It is widely used in microscopic imaging, Raman spectroscopy, biochemical analysis instruments, life sciences, education and scientific research and other related fields.

Ultrasteep Longpass Filter, Φ25mm, Laser Wavelength=830nm, United Optical Technology Co., Ltd (CAT#: STEM-OP-3805-YJL)
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