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Pairing a laser rangefinder with a thermal imager

Thermal cores and rangefinders are usually bought separately and integrated by the same team. The failure modes are mechanical and thermal, not optical.

Boresight, not alignment

The rangefinder's beam and the thermal core's optical axis must be boresighted at the distance you care about, and the mount must hold that through a −40 °C to +70 °C swing. Design for adjustment at the far field, not on the bench.

Heat

A 1535 nm module dissipates 2–3 W in a housing that is also holding a thermal core. Put the rangefinder on its own thermal path, and remember that the rod's pulse energy is temperature sensitive — the manufacturer's numbers are at a stated ambient.

Choosing the module

Match the divergence to the thermal core's field of view. A 1.3 mrad beam inside a 3° FOV means the operator ranges a spot much smaller than the image, which is what you want for discrimination and not what you want for a quick estimate.

Modules that fit this application

Shortlist is a starting point, not a recommendation — the right module depends on target, visibility and pointing error. Filter the full matrix.