High-Performance TE-Cooled InGaAs Spectrometer: Sol 2.6

Sol™ 2.6—a high-performance linear InGaAs array spectrometer from B&W Tek—offers a wide dynamic range, 256 pixels and high throughput, TE cooling down to −15 °C through an integrated three-stage cooler.

All spectrometers are equipped with an SMA 905 fiber optic input and an integrated 16-bit digitizer. The instruments are USB 2.0 plug-and-play compatible.

Furthermore, the integrated autozero function automatically decreases dark current and dark non-uniformity, leading to a better signal-to-noise ratio. Through software control, users can select from four kinds of operation modes—that is, Maximum Sensitivity, Maximum Dynamic, High Sensitivity and High Dynamic. Custom-made spectral resolution and application support are also provided.


  • NIR spectroscopy
  • Process monitoring
  • On-line analyzer
  • Quality control
  • Biological applications


  • Built-in 16-bit digitizer
  • Built-in autozero (noise level reduction)
  • A spectral range* of 1550nm–2550nm
  • Excellent sensitivity and low dark noise
  • NIR TE-Cooled InGaAs array spectrometer
  • Four dynamic and sensitivity range modes to suit specific application requirements

*Custom ranges available


  • Fiber sample holders
  • Fiber sampling probes
  • Fiber patch cords
  • Light sources

Thermoelectric Cooler

An effective method to decrease noise and dark current is to cool an array detector with an integrated thermoelectric cooler (TEC). This method also helps improve the detection limit and dynamic range.

When the TEC is used to cool the InGaAs array detector from a room temperature of 25 °C down to −15 °C, the dark current is decreased by around 32 times, while the dark noise is decreased by around 5.7 times. This enables the spectrometer to work at longer exposure times and to identify weaker optical signals.


Source: B&W Tek

DC Power Input 5V DC @ 5 amps
AC Adapter Input 100 - 240VAC 50/60 Hz, 1.0A @ 120VAC
Detector Type Linear InGaAs Array
Pixels 256 x 1 @ 50 µm x 250 µm per element
Spectrograph f/# 3.5
Spectrograph Optical Layout Crossed Czerny-Turner
Dynamic Range Maximum Dynamic mode: 25,000:1
High Dynamic mode: 12,500:1
High Sensitivity mode: 12,500:1
Maximum Sensitivity mode: 1,700:1
Digitizer Resolution 16-bit or 65,535:1
Readout Speed 500 kHz
Data Transfer Speed >300 spectra per second via USB 2.0
Integration Time 250 µs to >= 64 seconds
External Trigger Aux port
Operating Temperature 0 °C - 35 °C
TE Cooling Three-Stage: -15 °C @ relative humidity = 90%
Weight ~ 3.1 lbs (1.4 kg)
Dimensions 7.8in x 4.3in x 2.7in (197 mm x 109 mm x 68 mm)
Computer Interface USB 2.0 / 1.1
Operating Systems Windows: 7, 8, 8.1 (32-bit & 64-bit)




Image Credit: B&W Tek

Entrance Slit

Source: B&W Tek

Slit Option Dimensions Approximate Resolution 1550 -2550 nm
75 mm 75 mm wide x 1 mm high ~15.0 nm
Custom slit widths available


Diffraction Grating

Source: B&W Tek

Spectral Coverage (nm) Grating Approximate Resolution 75 µm Slit
1550-2550 100/2500 15.0 nm
Custom configurations available



BWSpec® is a spectral data acquisition software with an array of tools developed to carry out difficult calculations and measurements at the touch of a button. It enables users to select between numerous data formats and optimize scanning parameters, like integration time. Apart from robust data processing and data acquisition, other features comprise spectrum smoothing, automatic dark removal and manual/automatic baseline correction.


Image Credit: B&W Tek

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