{"product_id":"thz-power-meter-uri","title":"Uri THz Power Sensor, Pyroelectric, \u003c 1 nW\/sqrt(Hz)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Uri sensor is a room-temperature pyroelectric power head for the terahertz band, with a noise equivalent power below 1 nW per root hertz. It measures total incident power rather than the field waveform, which makes it the practical instrument for the routine questions that come up every day on a terahertz beamline: is the source running at its usual level, did the last realignment help, how much power is the sample absorbing.\u003c\/p\u003e\n\u003ch2\u003eCoherent versus non-coherent detection\u003c\/h2\u003e\n\u003cp\u003eElectro-optic sampling gives the full field waveform with amplitude and phase, but it requires a probe beam, a delay line, a balanced detector and a lock-in, and it takes a scan to produce one measurement. A pyroelectric head gives a single number immediately and needs none of that. Most working terahertz labs use both: the power head for setup and monitoring, electro-optic sampling for the actual spectroscopy.\u003c\/p\u003e\n\u003ch2\u003eReading the output\u003c\/h2\u003e\n\u003cp\u003eThe analog output on SMA or BNC connects directly to an oscilloscope for a quick look, or to a lock-in amplifier referenced to an optical chopper when the signal is small. Chopping and lock-in detection are worth the extra hardware whenever the terahertz power approaches the noise floor, since they move the measurement away from low-frequency drift. A digital ADC output can be supplied if the sensor needs to feed a data acquisition chain directly.\u003c\/p\u003e\n\u003ch2\u003ePractical notes\u003c\/h2\u003e\n\u003cp\u003ePyroelectric detectors respond to changes in incident power rather than to a steady level, so a modulated or pulsed source is required; a continuous unmodulated beam will not give a stable reading. Keep the sensor face clean and avoid air currents across it, since the element also responds to thermal disturbance. Because the response is broadband, block residual near-infrared pump light before the sensor or the reading will include it.\u003c\/p\u003e\n","brand":"Swiss Terahertz","offers":[{"title":"Default Title","offer_id":48987925545114,"sku":"SWT-URI","price":0.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6156\/3546\/files\/SWT-URI-card-square_e2c481f3-2ceb-48d0-8a5c-988703064229.jpg?v=1786343880","url":"https:\/\/waveqvanta.com\/products\/thz-power-meter-uri","provider":"WaveQuanta","version":"1.0","type":"link"}