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Spatial filtering without refocusing and pinhole assembly |
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Highly cost effective and small footprint |
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Easy alignment by angle tuning in standard kinematic mount |
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Compatible with high-power operations over 1 kW |
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Compatible with high-energy operations up to 5 J/cm2 |
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Simultaneous spatial and spectral filtering (<5 cm-1 to laser line) |
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Supports operation at temperatures up to 400° C |
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Based on reflective Volume Bragg Gratings (VBG) |
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Imperfections in laser optics and variations in laser gain medium cause side fringes and spatially varying intensity.
Our spatial filters are designed to "clean up" laser beams from these deficiencies.
14SPF Spatial Filters provide a simple, compact, and cost effective solution for laser beam spatial filtering.
BSF is based on reflecting volume Bragg grating with a narrow acceptance angle that enables
filtering of laser beams with a single element, thus replacing pinhole assemblies in case of
narrow line laser sources. In addition to spatial filtering, 14SPF's provide ultra-narrow line
spectral filtering and can be used for high-power/high-energy applications.
14SPF Spatial Filters have superior environmental stability and can handle high power optical
radiation and high operations temperatures.
Standard specifications
| Input Angle: | 8.5 ± 1° |
| Output Angle: | - 11.5 ± 1° |
| Diffraction Efficiency: | > 90% |
| Grating Thickness: | 2.2 ± 0.5 mm |
| Spectral Bandwidth, FWHM: | < 0.3 nm |
| Angular Acceptance, FWHM: | < 5 mrad |
| Deflection Angle: | 20° |
| Grating Aperture: | 5 mm x 5 mm (clear aperture >85%) |
| AR Coating: | Broadband low power, R < 0.5% per surface |
| Mounting: | Mounted in Ø25 mm ring (optional Ø12.7 mm) |
Applications:
Filtering of spatial noise in laser beams
Ultra-narrow linewidth spectral filtering of laser beams
ASE filters for diode laser sources
Wavelength-tunable spatial and spectral filters
Product selection guide
| Wavelength | Grating aperture, mm | Ordering code |
| 405 nm | 5 x 5 | 14SPF-1-1-405 |
| 488 nm | 5 x 5 | 14SPF-1-1-488 |
| 514 nm | 5 x 5 | 14SPF-1-1-514 |
| 532 nm | 5 x 5 | 14SPF-1-1-532 |
| 632.8 nm | 5 x 5 | 14SPF-1-1-633 |
| 785 nm | 5 x 5 | 14SPF-1-1-785 |
| 1064 nm | 5 x 5 | 14SPF-1-1-1064 |
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Spatial filtering of 632.8 nm HeNe laser with 14SPF Filter |
Custom designed 14SPF - Precision Type Reflective Spatial Filters are
available upon request with the following parameters:
Diffraction Efficiency (DE): 90-95%
Spatial Noise Suppression: up to 30 dB
Center Wavelength Range: 400-2300 nm
Center Wavelength Tunability (angle tuning): up to 50 nm
Filter Thickness: 2-5 mm
Deflection Angles: 5-90°
Lateral Dimensions: up to 25 x 25 mm2
Related products
Ordering
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