Product Overview
Used Molectron / Coherent PM150 Air-Cooled Thermopile Laser Power Sensor
The Molectron / Coherent PM150 is an air-cooled thermopile laser power sensor designed to measure continuous-wave and pulsed laser output across a wide power range. Known for its reliability and accuracy, it converts absorbed laser energy into measurable electrical signals for use with compatible power meters.
Originally built by Molectron and later carried forward by Coherent after acquisition, the PM150 reflects a lineage of precise optical instrumentation used in research, manufacturing, and calibration environments. This sensor design became a mainstay in laboratories requiring consistent thermal response and rugged power handling.
Product Condition
This unit is pre-owned and shows minor surface wear on the sensor area. Overall condition is good. The item has not been tested and is offered as-is, based on visual inspection only.
Product Overview
The PM150 thermopile sensor measures laser power through heat absorption and voltage conversion. Its air-cooled design allows operation without external cooling systems, simplifying setup in lab or production environments. The durable housing and standardized mounting threads make it compatible with Coherent and Molectron power meters for a range of optical test applications.
Key Features
- Model: PM150 thermopile laser power sensor
- Manufacturer: Molectron / Coherent
- Air-cooled design for continuous operation
- Measures optical power via thermopile absorption principle
- Compatible with Coherent power meters and legacy Molectron models
- Rugged housing suitable for lab and field use
- Standard mounting interface and connector
- Wide measurement range for continuous-wave and pulsed lasers
- Passive thermal design, no liquid cooling required
- Well-regarded in optical test and measurement communities
Applications
- Laser power measurement and calibration
- Optical lab research and development
- Laser alignment and system diagnostics
- Manufacturing process monitoring
- Photonics instrumentation repair or integration
- Educational optics laboratories
- Testing or restoring legacy Coherent systems
Frequently Asked Questions
Has this sensor been tested?
No, it has not been tested. It is sold as visually inspected only.
What type of cooling does the PM150 use?
The PM150 uses an air-cooled thermopile, which allows for heat dissipation without liquid cooling systems.
Which power meters are compatible with this sensor?
It is compatible with many Coherent and legacy Molectron meters designed for thermopile input sensors.
What is a thermopile sensor used for?
Thermopile sensors measure laser power by converting absorbed thermal energy into a proportional voltage signal.
Can it be used for pulsed lasers?
Yes, within rated parameters, the PM150 can measure both CW and pulsed laser output power.
From Molectron’s precision optics heritage to Coherent’s modern photonics legacy, this PM150 stands ready for its next chapter—whether in calibration, restoration, or rediscovery.
