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We are developing a cryogenic radiometer (CR) with a superconducting thermometer for the optical laser power calibration. This device consists of a niobium transition edge sensor and an electrical substitution heater on a silicon substrate. The device temperature is locked at the niobium transition temperature with a superconducting quantum interference device amplifier and a proportional-integral-derivative...
A new type calorimeter for precise measurement of 10 W level laser power has been designed and fabricated. This is a double configuration consisting of an absorbing unit made of a disk absorber and an isothermal unit. The ratio of the substituted laser power to the dc power is determined for the absorbing unit. The design of basic construction and experimental results are described
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