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The sensitivity S [V/W] is the ratio of voltage U [V] generated due to the incident laser power P [W] on the sensor. The voltage generated depends on the Seebeck coefficient of the thermoelectric material; hence it is a material specific constant. [9] The incident power can be calculated by measuring the sensor voltage and using the formula:
An avalanche photodiode (APD) is a highly sensitive type of photodiode, which in general are semiconductor diodes that convert light into electricity via the photovoltaic effect.
An optical power meter (OPM) is a device used to measure the power in an optical signal. The term usually refers to a device for testing average power in fiber optic systems. Other general purpose light power measuring devices are usually called radiometers , photometers , laser power meters (can be photodiode sensors or thermopile laser ...
Advanced Energy Industries, Inc. is an American multinational technology company headquartered in Denver, Colorado [4] that develops precision power conversion, measurement and control technologies for the manufacture of semiconductors, flat panel displays, data storage products, telecommunications network equipment, industrial coatings ...
Thorlabs, Inc. is an American privately held optical equipment company headquartered in Newton, New Jersey. [2] The company was founded in 1989 by Alex Cable , who serves as its current CEO . His daughter, Jennifer Cable, serves as president. [ 3 ]
The silicon avalanche photodiode is a high-gain photon detector. They are "ideal for use in high-speed, low-light-level applications". [3] The avalanche photodiode is operated with a reverse bias voltage of up to hundreds of volts, slightly below its breakdown voltage.
Avalanche photodiodes are photodiodes with structure optimized for operating with high reverse bias, approaching the reverse breakdown voltage. This allows each photo-generated carrier to be multiplied by avalanche breakdown , resulting in internal gain within the photodiode, which increases the effective responsivity of the device.
Borosilicate glass is commonly used for near-infrared to about 300 nm. High borate borosilicate glasses exist also in high UV transmission versions with high transmission also at 254 nm. [ 22 ] Glass with very low content of potassium can be used with bialkali photocathodes to lower the background radiation from the potassium-40 isotope.
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