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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Risk factors: Except for the historical information contained here, many of the matters discussed in this Web site are forward-looking statements, based on expectations at the time they were made, that involve risks and uncertainties that could cause our results to differ materially from those expressed or implied by such statements. These risks are detailed in the “Factors That May Affect Future Results” section of our latest 10-K or 10-Q filing. Coherent assumes no obligation to update these forward-looking statements.

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