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High spectral selectivity |
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Superior environmental stability, no degradation over lifetime |
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High powered operations over 1 kW |
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High average power operation >20 W |
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High energy operations up to 5 J/cm2 |
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No polarization dependence |
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Near-diffraction-limited beam quality |
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Based on reflective Volume Bragg Gratings (VBG) |
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14BAF Precision Type Reflective Bandpass Filter is a Reflecting Bragg Grating (RBG) recorded in a bulk of photosensitive silicate glass.
These filters are used to clean up laser spectral noise with a bandwidth as narrow as 50 pm in visible and near IR regions.
In Raman spectroscopy applications, combining 14BAF Filters with matching 14NOF Filters enables Raman shift measurements down to 5 cm-1 from the laser line.
These filters have superior environmental stability and can handle high power optical radiation and high operational temperatures.
Standard specifications
| Design Wavelength: | 408 nm, 488 nm, 514 nm, 532 nm, 632.8 nm | 785 nm, 1064 nm |
| Input Angle: | 8.5 ± 1° | 4 ± 1° |
| Output Angle: | - 11.5 ± 1° | - 16 ± 1° |
| Diffraction Efficiency: | > 90% |
| Grating Thickness: | 2.2 ± 0.5 mm | 8 ± 1 mm |
| Spectral Bandwidth, FWHM: | < 0.3 nm | < 0.12 nm |
| Grating Aperture: | 5 mm x 5 mm (clear aperture > 85%) | 5 mm x 7 mm (clear aperture 85%) |
| AR Coating: | Broadband, R < 0.5% per surface |
| Mounting: | Mounted in Ø25 mm aluminum ring (optional Ø12.7 mm) |
Applications:
Ultra-low frequency (Terahertz) Raman spectroscopy
Spectral filtering and noise cleaning of laser beams
ASE filters for Raman laser diode sources
Spectral detection
Tunable filters for high resolution spectroscopy
Product selection guide
| Wavelength | Grating aperture, mm | Ordering code |
| 405 nm | 5 x 5 | 14BAF-1-1-405 |
| 488 nm | 5 x 5 | 14BAF-1-1-488 |
| 514 nm | 5 x 5 | 14BAF-1-1-514 |
| 532 nm | 5 x 5 | 14BAF-1-1-532 |
| 632.8 nm | 5 x 5 | 14BAF-1-1-633 |
| 785 nm | 5 x 5 | 14BAF-2-1-785 |
| 1064 nm | 5 x 5 | 14BAF-2-1-1064 |
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Schematics of a possible 14BAF filter configuration |
Custom designed Bandpass Filters are available upon request with the following parameters:
Diffraction Efficiency (DE): >90%
Spectral Bandwidth: 50 pm to 0.5 nm
Operating Range λ: 350-2700 nm
Grating Thickness: 0.5-15 mm
Apertures: 1-10 mm2
Deflection Angles: 5-90°
Related products
Ordering
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