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Doc 18369-S01_Revc.doc Rev C 13-Jan-12
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S310C Thermal Power Head
The S310C is a power meter head, designed for power measurements up to 15W with low drift and high
resolution. It is an ideal choice for light sources with a broadband spectrum like ASE, LED, filament lamps or
swept sources, where calibrated photodiodes fail due to their strong wavelength dependency. The sensor
works from the UV to the IR with a flat response with a negligible back reflection from the black coating.
Another excellence is the average power measurement from pulsed laser sources whereby the peak power
may be higher than the maximum rated power as long it doesn’t exceed the damage threshold of the
maximum power density.
To perform accurate measurements the S310C has to be zeroed before starting a measurement. Further it is
recommended to prevent the sensor from air flow or other thermal disturbances. The head has a built in
thermistor to control a overheating of the sensor.
The S310C is compatible with the all Thorlabs power meter consoles. A non-volatile memory in the sensor
connector contains sensor information data and the NIST and PTB traceable calibration data.
Technical Specifications
Sensor Model S310C
Optical Power Range (Continuous) 10mW - 10W
Wavelength Range 0.19 - 25μm
Application CW and Long Pulses (Diode, ArIo, KrIo, Dye, CO2, He-Cd,
(Nd-YAG))
Detector Type Thermal Surface Absorber
Coating Broadband BBF
Detector Size (active area) Ø20mm
Distance Frontface to Detector 15mm
Power Resolution 1) 200μW
Calibration Uncertainty +/- 3% @ 1064nm 2)
+/- 5% @ 190nm - 1064μm 3)
Linearity +/- 1%
Max Intermittent Power (2min max) 15W
Max. Average Power Density 200 W/cm²
Max. Pulse Energy Density 0.2J/cm² (1μs pulse)
2J/cm² (1ms pulse)
Response time with display (0-90%) 2) < 1 sec.
Cooling Convection
Head Temperature Measurement Thermistor 2kΩ
Sensor Dimensions 55 x 55 x 54 mm³
Connector Cable Length 1.5m
Connector Sub-D 9p male
Mounting and accessories SM1 adapter via 4 x #4-40 cage threads
Post M6, 75mm post included
Weight 0.36 kg
Console Compatibility PM100D, PM100A, PM100USB, PM200, PM320E
1) with PM100D console, acceleration circuit off
2) Other calibration wavelengths on request
3) Spectral calibration - the response values for wavelength correction outside this calibration range, is interpolated from the
general absorption curve of the absorber.