Spectrometer

A spectrometer comprising:

• an entrance aperture,
• a collimator intended to produce, from a light source, a collimated input light,
• a plurality of gratings,
• an exit aperture, and
• a plurality of detectors,
• wherein said gratings are tunable and arranged to form a 2D-matrix to diffract said collimated input light, each of said gratings producing a distinct collimated beam with a narrow band of wavelength and each of said detectors being associated with one grating of said plurality of gratings and arranged to measure the intensity of said distinct collimated beam with a narrow band of wavelength produced by said grating.

A monochromator comprising:

• an entrance aperture,
• a collimator, intended to produce, from a light source, a collimated input light,
• a grating comprising a plurality of elongated beams placed on a substrate, said elongated beams being arranged parallel to each other along an axis x, the longitudinal axis of each of said beams being perpendicular to the axis x and the distances e between two consecutive beams in the direction of x being equal and tunable, and
• an exit aperture,
• wherein the top of each elongated beam comprises on a first longitudinal side, a first tilted reflective flat surface parallel to each first tilted surface of said elongated beams, and, on a second longitudinal side, a second tilted reflective flat surface, parallel to each second tilted surface of said elongated beams.