Spectrometer 2.0 - 5.0 μm

The fastest and most sensitive mid-infrared spectrometer on the market

Key features

  • Up to 130 kHz full-spectrum readout rate
  • -80 dBm/nm sensitivity
  • 2.0 – 5.0 μm bandwidth
  • Fiber-coupled input
  • Plug-n-play
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You can also download the data sheet to get more technical details.


You can also download the data sheet to get more technical details.

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mid-infrared spectrometer?

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Spectrometer Details

Developers in both industry and research use mid-infrared (MIR) spectrometers for non-invasive characterization of gases, liquids, and solids as well as characterization of light sources. The NLIR 2.0 – 5.0 µm Spectrometer (S2050-400/S2050-130k) is based on a novel measurement scheme that upconverts the MIR light to near-visible light. Silicon-based near-visible light detectors are far superior to MIR light detectors in terms of detectivity, speed, and noise. The NLIR upconversion technology, therefore, brings these attractive features and the advantages that follow, to the MIR regime.

Both editions seen below have sensitivities at -80 dBm/nm or better, and the maximum full-spectrum readout rate is 130 kHz! As a result, the spectrometer enables the characterization of light sources and measuring spectral content from chemical processes with a time resolution of less than 10 µs.

Two application examples

Demo 1: Measuring liquid content with a mid-infrared fiber probe

By using NLIR‘s S2050 mid-infrared spectrometer, you can get fast response and accurate resolution such that you can monitor liquid content in real-time.

Demo 2: Capturing 80.000 mid-infrared spectra per second.

NLIR‘s kHz-rate spectrometer can upconvert mid-IR light to near visible wavelengths. This means that you can benefit from CMOS technology to capture the photons.  

Spectrometer Measurements Examples

S2050-130k spectrometer measurements

40 kHz Single Pulse Measurement

Single pulses from a super-continuum light source with a bandwidth of 3.0 µm – 4.2 µm and a repetition rate of 40 kHz of 2 ns pulses were measured with 80 kHz readout rate. In the figure, (a) shows raw data of 12 ms data acquisition, (b) shows a zoom where every other readout is empty as expected from 40 kHz rep-rate and 80 kHz sampling, (c) shows 10 raw consecutive spectra. The fluctuations in the spectra are by far dominated by noise from the light source.

Based on this measurement, the S2050-130k spectrometer is capable of characterizing fast modulations of infrared lasers and other dynamic events. 

Plastic Transmission

A 30 W globar was the mid-infrared light source in these transmission measurements of a 50 µm polystyrene (PS) film and a 800 µm polyethylene terephthalate (PET) film. The S2050-400 spectrometer was set to 20 ms exposure time and capturing just single shots. No averaging or smoothing has been applied to the data subsequently.

Computer algorithms can certainly tolerate a much shorter exposure time, and thus a faster acquisition, in the context of plastic recognition or thickness analysis.

plastic recognition spectrometer
coating quality contro measurement

Optical Coating Transmission

A 30 W globar was the mid-infrared light source for these transmission measurements of coated optical windows: a Ge bandpass filter (BPF) for 3.7 – 4.5 µm and a YAG mirror coated with high reflection at 1064 nm and high transmission at 2.1 -4.5 µm. The S2050-400 spectrometer was set to 20 ms exposure time and captured just single shots. No averaging or smoothing has been applied to the data subsequently.

Coating quality control or production monitoring require such measurements.

Fiber Reflection Probe

fiber reflection probe is a single-bounce attenuated total reflection (ATR) crystal that has fiber-coupled input and output. In this measurement, the inpur fiber received light from a 30 W globar, and the output fiber delivered the light from the probe to the S2050-400 spectrometer. By first taking a reference with the ATR probe in air, the probe was subsequently inserted into water, propane-2-ol, and sunflower oil, respectively, producing these absorption plots.

The measurements were single-shot at an exposure time of 100 ms, and a 4-pixel wide Gauss filter smoothed the data subsequently.

fiber reflection probe spectrometer measurement

Published work using NLIR's 2.0 µm - 5.0 µm MIR spectrometer

In addition to numerous industrial applications of NLIR’s products, scientists have published their work using NLIR’s MIR spectrometer. Check them out here (requires access):

Free Spectrometer Software

  • A simple and easy-to-use software program.


  • Data live stream, external trigger mode, background capture, transmission view, data saving, etc.


  • API for spectrometers in MATLAB and Python available upon request.

Are you looking for a faster alternative to FTIR spectrometer?

Explore NLIR advantages over conventional FTIR devices

How can the S2050 Spectrometer solve your application measurements?

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Let's talk!
How can we help you?

Grab a chat with one of our optics experts who would gladly answer all your questions.

Let's talk!
How can we help you?

Grab a chat with one of our optics experts who would gladly answer all your questions.