SureBlock™ XLF Notch Filter Systems
SureBlock™ XLF Notch Filter Systems

SureBlock™ XLF Notch Filter Systems

Coherent’s patented SureBlock™ XLF Notch Filter Systems enable fast, clear capture of Raman spectra in the Low-Frequency/Low Wavenumber/THz regime (~5 cm-1 to 200 cm-1, or 150 GHz to 6 THz), as well as the standard chemical fingerprint region, using only a standard single-stage spectrometer. THz-Raman® is powerful new technique for molecular and intermolecular structural analysis that is both simple and compact when compared to multi-stage or THz spectrometers, and represents a dramatic shift in the economics, efficiency, and ease of use of Raman spectroscopy.

The unique ultra narrow-band design of our patented SureBlock Notch Filters also delivers exceptionally high throughput of both Stokes and anti-Stokes shifts up to >5000 cm-1 (>150 THz). This allows observation of low-frequency vibrational/phonon modes, differentiation of polymorphs, and other structural characteristics of pharmaceuticals, nano- and bio-materials; trace detection and forensics analysis of explosives and chemical/biological threat agents; and characterization of industrial, polymers, petroleum, heavy metals, and geological samples.

The XLF is an integrated, pre-aligned, light-tight, double-notch system with selectable fiber- or free-space input and outputs, adaptable for use with any single-stage spectrometer. All XLF systems provide > OD 8 Rayleigh suppression, and are engineered for fast, flexible integration with a wide variety of existing commercial spectrometers microscopes, and Raman systems. Available at standard Raman wavelengths including: 488 nm, 514 nm, 532 nm, 633 nm, and 785 nm, and 830 nm, these compact, robust plug-and-play systems deliver incredible speed, resolution, and ease of use, all at an extremely affordable price!

Double-Notch Filter System Adaptable for

Any Single-Stage Spectrometer


Parameter 488 nm 514 nm 532 nm 633 nm 78X nm
Spectral Transition Width (center to 50% transmission) <10 cm-1 <10 cm-1 <10 cm-1 <10 cm-1 <10 cm-1
Optical Density at Laser Line (each filter) >4 >4 >4 >4 >4
Expected System Optical Density >8 >8 >8 >8 >8
Free Space Aperture Diameter Standard: 9 mm, custom sizes available.
Fiber Input/Output Connector Type Recommended: FC/PC, others available upon request.

SureBlock™ XLF Specifications



Polymorph Identification
Explosives & Drug Detection

Features & Benefits

  • Fast collection of ultra-low-frequencey/THz-Raman spectra
  • High Optical Density (.OD8) with extremely high thoughput*
  • Ultra-compact footprint, plug-and-play operation, configurable input and output ports (free space or fiber coupled)
  • Compatible with most commercial spectrometers, microscopes, and Raman systems
  • Available at 488, 514, 532, 633, 785 and 830 nm. Custom wavelengths by request.

*Throughput varies with wavelength

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