Skip to menu


​​SM304 InGaAs Array Spectrometer

The Choice for Low Signal Level NIR Applications


- New Lower Pricing
- Scientific-grade high performance
- Extremely low dark noise and stray light

- Wide dynamic range and high signal to noise ratio
- High stability
- Flexible optical input direct to slit or via fiber
- Designed from the ground up for a wide range of applications
- High speed data acquisition
- Various NIR range from 900 - 2500nm
- Auto shutter for dark condition


Spectral Products is offering the new SM304 TE cooled InGaAs array spectrometers. The SM304 series are ideal for NIR spectrometry that requires very high signal to noise ratio and/or high dynamic range. The high performance with low-noise level of the SM304 series makes it possible to apply in very demanding applications. The good sensitivity of the detectors used in the SM304 series allows various broad-band applications like, measuring optical properties of various samples in NIR range, analyzing chemicals/moisture detection, as well as a narrow band applications like NIR laser characterization. Standard interface to the SM304 series is a USB 1.1/2.0 compatible interface with 16-bit. Software support includes a SDK and DLLs for dedicated applications development and our SM32Pro Windows-based spectral acquisition and analysis software. The new upgraded SM304 provides the auto-shutter function to make dark conditions automatically. Users don't need to block any input light for setting 0% transmission (dark scan).

Contact Us


- SM32Pro - Windows (32-bit/64-bit) based software for data acquisition and analysis

- Transmission, reflectance, and absorbance measurements

- Data export, zoom in and out, spectrum overlays, and more features

- Color analysis tools included

- Signal average and integration time control

- DLL libraries available for easy user software development in DOS and Windows

- VC++ / VB / LabView / Matlab examples available













Spectral Response Range (µm)

0.9 - 1.7

0.9 - 2.2

0.9 - 2.5

0.9 - 2.05

0.9 - 2.5

Pixel Size

25 x 500µm

25 x 250µm

25 x 250µm

50 x 500µm

50 x 500µm

Optical Resolution

 >3nm overall

 >5nm overall

 >6.5nm overall

 >7nm overall

 >9nm overall

Signal to Noise ratio

 >15,000:1 @100ms

 >10,000:1 @100ms

 >10,000:1 @100ms

 >10,000:1 @100ms

 >7,500:1 @100ms

Dark Noise RMS

6RMS @100ms

6RMS @100ms

16RMS @10ms

6RMS @100ms

8RMS @10ms

Spectrograph f#


Fiber Coupler

SMA905 or FC standard 

Stray Light

< 0.01% @632nm (< 0.05% avg)

min. Intergration Time


Trigger mode

Free Run mode
Software Trigger mode
External Trigger mode
TTL Edge Trigger input/digital output for monitoring

Orders Sorting Filter

Longpass filter or linear variable filter installed per wavelength coverage

Computer Interface

USB 1.1 / 2.0 16-bit (0 - 65535), support up to 8 multi-channel configuration


Windows XP/VISTA/Win7, 8.1, 10 (32/64bit)
SM32Pro & SM32Pro MX (free with spectrometer)

Includes DLL libraries and SDKs for easy custom application development

Dimensions (inches)

6.81H x 4.72W x 2.95D inches



Slit Options

10, 25, 50, 100, 200, and 400µm

TE Cooling Temperature