Device for measuring the performance of an optical detector, and associated measuring method

A device for measuring the performance of an optical detector comprising:

• a cryostat comprising a vacuum pump configured to place the cryostat under vacuum and a cryogenic cooler configured to cool the cryostat;
• a holder capable of receiving the detector, secured to the inside of the cryostat;
• means for measuring the performance of the detector;
• and
• a screen arranged around the holder capable of limiting radiation likely to reach the holder in a wavelength range of the detector;
• wherein the measurement device also comprises:
• a single-mode optical fiber in the wavelength range of the detector;
• the single-mode optical fiber being inserted in an opening of the cryostat and comprising:
• a first end secured to an opening of the screen, to project a luminous flux onto all or part of the detector;
• and
• a second end, external to the cryostat, intended to receive the luminous flux;
• and
• at least two modules for generating the luminous flux that incorporate a fibered source capable of generating the luminous flux in the second end of the single-mode optical fiber;
• the means for measuring the performance of the detector being capable of measuring said performance according to the luminous flux received on the second end;
• where a plurality of distinct measurements may be performed by interchanging a one of the two modules connected on the second end of the single-mode optical fiber.