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VCSEL Measurement

VCSEL characterization with spectral resolution down to 0.12 nm

VCSEL Measurement

VCSEL Measurement

VCSEL characterization with spectral resolution down to 0.12 nm

VCSELs are characterized by excellent beam properties and are thus particularly suitable for critical applications. Typical examples are facial recognition via LiDAR. The use of laser diodes in the presence of humans, however, makes precise characterization of their beam properties essential and presents enormous challenges to the measuring system used.

Based on the high-resolution version of the CAS series of spectroradiometers, Instrument Systems offers a measuring system optimally tuned to VCSEL characterization in the lab. With the appropriate accessories it fulfils diverse individual requirements.

Key Features:

- Excellent spectral resolution down to 0.12 nm

- Integration times from 4 ms

- Array spectroradiometer specially for pulsed laser diodes / VCSELs




High-resolution CAS 140CT-HR with up to 0.2 nm spectral resolution as a high-end measurement solution with cooled CCD detector for highest stability, e.g. in a reference system.

High-resolution CAS 120B-HR with up to 0.1x nm spectral resolution as a high performant yet cost-efficient alternative to the CAS 140CT-HR.

Integrating sphere

ISP 75 and ISP 100 with small internal diameter of 75 and 100 mm. The small form factor is particularly suitable for installation in handler and prober systems. 

Optional: ISP 100 with photodiode, e.g. characterization of pulse form with pulsed laser diodes.

Alternative: ISP 150L with 150 mm internal diameter and 50 mm diameter of the measurement port for larger laser modules/arrays and self-absorption correction capability with the aid of an integral auxiliary light source.

CalibrationCalibration traceable to national standards as PTB or NIST.


SpecWin Pro laboratory software. CAS.dll and SDK for integration into the customer’s production flow.

IR reference LED (optional)

ACS-570-15, -17: reference LEDs with 860 nm and 950 nm. For stable operation and high precision, it is recommended that it be used in combination with the highly stable PSU-10 power source.


Examples of applications