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Raman Slim Immersion Probe

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Raman spectroscopy can now be applied to reaction monitoring and process control applications with the Process Raman Probe. The tec5USA Process Raman Probe combines the best features of optical design and mechanical robustness for sensitive and cost-effective process monitoring.

This probe is based upon the same quality optics as the standard Raman Probe, but to protect the optics from extreme heat, the probe body is kept at a distance from the reactor with an extension tube. The tube itself can be interfaced directly into reactors and process lines. With the optional purgeable housing, the probe is suitable for most industrial environments.

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Central to the design are filtering and focusing optics, maximizing optical throughput while completely attenuating the Rayleigh (laser) line. The probe uses only hard oxide filters that can withstand high temperature and humidity conditions. Single fiber collection provides a simple and cost-effective means to measure 100’s of meters away from the spectrograph.

The pressure-tight stainless-steel extension tube is equipped with a compression-welded sapphire window at the tip. A range of fixed working distances is available, as is a user-adjustable version. Other tube diameters are available upon request.

Process Raman Probe for reaction monitoring at elevated temperatures and pressures, for use at 785 nm excitation:

Stainless-steel probe body with custom Hastelloy electropolished bioreactor immersible extension sleeve, 12 mm diameter, ca. 9.75″ (248 mm) in immersible length

PG13.5 threaded fitting welded to extension sleeve, position TBD

Sapphire window sealed and welded to Hastelloy C-276 extension sleeve, providing focal point ca. 0.5 mm away from window face

Extension sleeve is specified up to 3000 psi (200 bar) and 450oC (842F). Probe body and cable must be maintained below 200oC

Patented micro-optics for beam steering and filtering of the laser line and fiber optic background features (OD 8 at the excitation wavelength)

Spectral range 200 – 5000 cm-1 Stokes**

5 meters of steel-encased fiber optic cable, 105?m excitation with FC/APC connector/ 600?m collection fiber with SMA905 connector

Manual shutter to block laser emission with built-in reference standard (patent pending)

Warning LED (cable includes electrical wires for warning LED)


  • Designed for high throughput, low background and compact size
  • Our coaxial probe captures as many photons as possible for the highest sensitivity
  • Probe OD <8 at the laser line, so no additional filtering in the spectrometer
  • Comes complete with fiber optic cable included
  • Available in six different excitation wavelengths and can be custom manufactured, including probes with alternate fiber sizes


  • Sampling Head Stainless-steel, 13/16" (206 mm) diameter probe body with stainless-steel extension tube, 3/8" (9.5 mm) diameter x 9" (228 mm) length.
  • Excitation Wavelengths 514, 532, 632, 670, 785, 830 nm, others available upon request
  • Spectral Range 200 - 3900 cm (Stokes)*
  • Working Distance User-selectable fixed working distance, from 0.5 to 6 mm. User-adjustable versions available on request.
  • Fiber Configuration Permanently-aligned combination of two single fibers (100 µm excitation fiber, 200 µm collection fiber) with filtering and steering micro-optics, N.A. 0.22, in stainless-steel jacket Option: fiber sizes ranging from 50 µm to 500 µm
  • Filter Efficiency Patented design for complete filtering of the laser line and quartz spectral contributions from both input and output fibers (O.D. > 8 at laser line)
  • Physical Resistance Pressure sleeve specified to 3000 psi and up to 500ºC. External optics must be maintained below 200ºC (purgeable housing sold separately).
  • Chemical Resistance 316 Stainless-steel sleeve, sapphire window (flat or lensed) and gold seal† are resistant to corrosive chemical environments
  • Cable Length 5 m steel-jacketed cable (std.), up to 200 m on request. PVC coating over steel cable optional.
  • Safety Features Emission indicator and safety shutter (std.)
  • Coupling System Available with FC (std.) or SMA connectors

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