High Performance Narrow Band Bandpass Filter, Φ25mm, CWL=405nm, United Optical Technology Co., Ltd (CAT#: STEM-OP-3420-YJL)

High Performance Narrow Band Bandpass Filter, Φ25mm, CWL=405nm, model 199449, is manufactured by United Optical Technology Co., Ltd.
The transmission band of the High Performance Narrow Bandpass Filter is surrounded by two cutoff bands. It allows only part of the spectrum to pass through, and is often used to transmit a portion of the spectrum while blocking all other wavelengths.
Bandpass filters are suitable for a variety of applications such as spectroscopy, clinical chemistry or imaging. Bandwidth is the spectral range of illumination light transmitted by an optical filter.
United Optical Technology has launched high-performance narrow-band bandpass filter standards with diameters of 12.5mm and 25mm in packaged and unpackaged versions and wavelengths of 355nm-1064nm laser wavelengths.

Diameter: Φ25mm
Center Wavelength(CWL): 405nm
Transmission Band: Tabs＞90%@405nm
FWHM (Nominal): 1.5nm(typical);2.8nm(maximum)
Blocking Band 1: ODabs＞5@353.5-401nm
Blocking Band 2: ODabs＞6@372.6-398.9nm
Blocking Band 3: ODabs＞6@411.1-445.5nm
Blocking Band 4: ODabs＞5@409.1-495.3nm
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: 0.1J/cm²@532nm(10ns pulse width)
Note: Arrow on ring indicates preferred direction of propagation of light.

This filter has the characteristics of narrow bandwidth (FWHM1.3nm~FWHM3nm), high transmittance (Tmax ≥90%), and deep cut-off depth (ODmax ≥ 6). It is widely used in microscopic imaging, spectroscopy, biochemical analysis instruments, life sciences, education and scientific research and other related fields.

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