Ophir Photonics Group (North Logan, UT), a Newport Corporation company, has introduced its RM9-PD radiometer for measuring the power of very low-level continuous-wave (CW) or quasi-CW sources. It integrates a photodiode sensor calibrated from 0.2 to 1.1µm  The sensor features a digitally synthesized lock-in amplifier that reduces external noise to a minimum, allowing the sensor to measure power levels from 300fW to 300nW. Sensor output can be displayed on the company's standard meters, or on a PC or Android smartphone or tablet. Additional features include an 18Hz chopper, an 8mm aperture, and fast response time (3.6s with display).

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