Product Overview
Used Molectron / Coherent PM150-50 Air-Cooled Thermal Head Laser Power Sensor – 50mm
The Molectron / Coherent PM150-50 is a 50mm-diameter thermal laser power sensor designed for accurate optical power measurements in laboratory and industrial applications. Using a thermopile detector and air-cooled housing, it converts absorbed laser energy into a measurable voltage signal for use with compatible Coherent power meters.
Originally produced by Molectron and later continued under Coherent, this sensor represents the enduring reliability of precision photonics instrumentation. The PM150-50 is part of a well-regarded family of thermal heads trusted for their stability, simplicity, and wide power-handling range.
Product Condition
Used, showing some surface marks on the sensor area. Overall in good cosmetic condition. The unit has not been tested by us and is offered as-is based on visual inspection only.
Product Overview
The PM150-50 features a large 50mm thermopile absorber for broad beam compatibility and efficient heat dissipation via its air-cooled design. It is suitable for continuous-wave and pulsed laser measurements across a range of wavelengths and power levels. Constructed with precision and durability, it can integrate easily into optical setups or testing benches requiring repeatable thermal response and accurate power readings.
Key Features
- Model: PM150-50 Thermal Head Laser Power Sensor
- Manufacturer: Molectron / Coherent
- 50mm diameter absorber area
- Thermal (thermopile) measurement principle
- Air-cooled operation – no liquid cooling required
- Compatible with Coherent power meter systems
- Measures CW and pulsed laser output power
- Rugged housing for lab or production use
- High sensitivity and wide dynamic range
- Designed for research, calibration, and laser diagnostics
Applications
- Laser power measurement and calibration
- Optical lab research and beam diagnostics
- Laser manufacturing and process monitoring
- Educational and R&D instrumentation setups
- Photonics test and alignment benches
- System integration or component replacement
- Legacy Coherent system restoration
Frequently Asked Questions
Has this unit been tested?
No, it has not been tested. It is sold as-is based on visual inspection.
What is the absorber diameter?
The sensor has a 50mm absorber area, ideal for large or unfocused beams.
What type of cooling does it use?
It uses air cooling, eliminating the need for external coolant systems.
What power meters are compatible?
It connects with many Coherent and legacy Molectron meters designed for thermopile sensors.
Can this measure pulsed lasers?
Yes, within its rated limits, it can measure both continuous-wave and pulsed laser output.
From Molectron’s early days of optical precision to Coherent’s global photonics lineage, this PM150-50 thermal head carries the quiet durability of instruments built to measure light itself—waiting for its next lab to illuminate.
