CAS 120-HR and CAS 120B-HR - High resolution array spectroradiometers for laser and VCSEL

The high resolution CAS 120-HR and CAS 120B-HR spectroradiometers are based on Instrument Systems’ high-performance array spectrometer CAS 120, a product line that has achieved extraordinary success around the world. The CAS 120-HR is particularly designed for the measurement of narrow band emitters, e.g. laser diodes. Therefore, the spectroradiometers combine the demands of high spectral resolution and short testing times for sophisticated and price-sensitive measurement tasks in production and laboratory environments.

All CAS 120-HR models are offered with a PTB traceable calibration. The integrated density filter wheel and the dark shutter additionally facilitate fully automated measurements over an extremely broad detector signal range. The spectroradiometers can be operated with Instrument Systems’ SpecWin Pro software for advanced laboratory applications. In addition, they are compatible with DLL and LabVIEW drivers for creating proprietary programs and integration into production equipment.


  • Spectral resolution down to 0.2 nm (0.12 nm for CAS 120B-HR) FWHM (0.05 nm data point interval)
  • Typical measuring ranges of 80, 120 and 160 nm within the spectral range from
    800 to 1000 nm (further spectral ranges < 800 nm available on request)
  • High-end actively cooled CCD detector for utmost measuring sensitivity and stability
  • Integrated density filter wheel enables an extremely wide intensity measuring range
  • Software solutions for laboratory and production applications


  • System solutions particularly designed for testing narrow band emitters, e.g. laser
    diodes and VCSELs
  • Very accurate characterization of narrow band emitters with very short pulses in laboratory and production applications
  • Short testing times enable industrial quality control in the production line

Technical Specifications:

CAS 120-HR Array Spectroradiometer
Accessible spectral range800 - 1000 nm 1
DetectorBack-thinned back-illuminated CCD
Number of pixels2048 x 16
Gratings1200, 1500, 1800 lines/mm
Measuring ranges (typical)80 – 160 nm
Spectral resolution (typical)0.2 – 0.4 nm (0.12 nm for CAS 120B-HR)
Data point interval (typical)0.05 – 0.1 nm
Wavelength accuracy 2)± 0.05 nm
Integration time 4 ms – 20 s
Sensor dynamic range 3)5500 : 1
Non-Linearity± 0.6%

1 Further spectral ranges upon request.
2 Applies to Penray lamp or laser.
3 For a single acquisition with 4 ms integration time.