Home > Filters > 14NOF - Precision Type Reflective Notch Filters
Based on reflective Volume Bragg Gratings (VBG)
Suitable for Ultra-low Frequency Raman Spectroscopy
Ultra Narrow Rejection Bandwidth (<10 cm-1)
Measurements of both Stokes and anti-Stokes modes
No degradation in high power light
Environmentally stable: high temperature operation, no humidity effects
No polarization dependence
14NOF Notch Filter is a reflective Volume Bragg Grating recorded in a bulk of photosensitive silicate glass.
Ultra-Narrow-Band Notch Filters reflect light with bandwidths as narrow as 5 cm-1 while all other wavelength pass unaffected with up to 95% total transmission.
14NOF's enable simultaneous measurements of Stokes and Anti-Stokes Raman bands down to 5 cm-1 with a single stage spectrometer.
Our Notch filters can withhold temperatures of up to 400° C and are fully environmentally stable with a practically unlimited life-time.
Central wavelengths of the filters can be angle tuned by several nanometers without reduction of the filter optical density.
Standard specifications
Central Wavelength:
488 nm
514.5 nm
532 nm
632.8 nm
785 nm
1064 nm
Transmission:
75%
78%
80%
88%
90%
95%
Input Angle:
6 ± 1°
Output Angle:
- 6 ± 1°
Blocking of Design Wavelength:
OD>3: > 99.9% OD>4: > 99.99%
Grating Thickness:
2.5 ± 1 mm
Spectral Bandwidth, FWHM:
< 0.4 nm
Internal Transmittance at 633 nm:
> 80%
Grating Aperture:
OD>3: 11 mm x 11 mm (CA> 85%) OD>4: 12.5 mm x 12.5 mm (CA>85%) OD>3: 12.5 mm x 12.5 mm (CA> 85%) OD>4: 11 mm x 11 mm (CA>85%)
AR Coating:
Broadband, R < 0.5% per surface
Mounting:
Mounted in Ø25 mm ring
Applications:
Pharmaceutical polymorphs
LA models of polymer
Semiconductor lattices and nanostructures
Material: phase/structure
Metal Halides
Gases
Carbon nanotubes
Micro, nano-crystallites
Spectral profiles of the narrowest thin film filter available on the market and
Notch Filter (14NOF). The bandwidth of a typical 14NOF is about 100-200 pm, whereas bandwidth of TF filters can't be narrower than 2-3 nm.
Optical density of single 14NOF is limited to about OD4 and, thus, to provide
sufficient Rayleigh light suppression depending on the measurement
wavelength 2 to 3 filters have to be used in sequence.
14NOFs are mounted
in Ø25 mm round aluminum holders for easy use with standard optomechanical assemblies
Product selection guide
Wavelength
Grating Aperture, mm: 11 x 11
Grating Aperture, mm: 12.5 x 12.5
OD: 3
OD: 4
OD: 3
OD: 4
488
14NOF-3-1-1-488
14NOF-4-1-1-488
14NOF-3-2-1-488
14NOF-4-2-1-488
514.5
14NOF-3-1-1-515
14NOF-4-1-1-515
14NOF-3-2-1-515
14NOF-4-2-1-515
532
14NOF-3-1-1-532
14NOF-4-1-1-532
14NOF-3-2-1-532
14NOF-4-2-1-532
632.8
14NOF-3-1-1-633
14NOF-4-1-1-633
14NOF-3-2-1-633
14NOF-4-2-1-633
785
14NOF-3-1-1-785
14NOF-4-1-1-785
14NOF-3-2-1-785
14NOF-4-2-1-785
1064
14NOF-3-1-1-1064
14NOF-4-1-1-1064
14NOF-3-2-1-1064
14NOF-4-2-1-1064
Custom designed 14NOF - Precision Type Reflective Notch Filters are available upon request with the following specifications:
Attenuation: > 99.99% (OD4+)
Spectral bandwidth (FWHM): 5-8 cm-1
Operating range: 400-2500 nm
Thickness: 2-4 mm
Apertures: up to 25 x 25 mm2
Angular selectivity: 2-10 mrad
Incident/Diffracted Angles: 0-45°
Transmittance: up to 95%
Transmission ripple: <1% at ±0.5 nm from laser line (@633 nm)
