Infrared spectrometer for detecting an infrared spectrum of light received from an object, wherein the spectrometer comprises: - a wavelength converter system comprising a nonlinear material and having a first input side and a second output side, the wavelength converter system comprising at least a first up-conversion channel and a second up-conversion channel, the wavelength converter system being arranged such that light traversing the wavelength converter system at different angles in the nonlinear material is imaged into different positions in an image plane, o the first up-conversion channel being configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and concurrently, o the second up-conversion channel being configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second output wavelength range output on the second side, - a demultiplexer configured for demultiplexing light in the first up-conversion channel and light in the second up-conversion channel, the demultiplexer being located on the first side of the wavelength converter system, and - a spatially resolved detector arranged in the image plane to detect light in the first output wavelength range and second output wavelength range output of the wavelength converter system. - a wavelength converter system comprising a nonlinear material and having a first input side and a second output side, the wavelength converter system comprising at least a first up-conversion channel and a second up-conversion channel, the wavelength converter system being arranged such that light traversing the wavelength converter system at different angles in the nonlinear material is imaged into different positions in an image plane, o the first up-conversion channel being configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and concurrently, o the second up-conversion channel being configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second output wavelength range output on the second side, o the first up-conversion channel being configurable for phase-matching infrared light in a first input wavelength range incident on the first side and light in a first output wavelength range output on the second side, and concurrently, o the second up-conversion channel being configurable for phase-matching infrared light in a second input wavelength range incident on the first side into light in a second output wavelength range output on the second side, - a demultiplexer configured for demultiplexing light in the first up-conversion channel and light in the second up-conversion channel, the demultiplexer being located on the first side of the wavelength converter system, and - a spatially resolved detector arranged in the image plane to detect light in the first output wavelength range and second output wavelength range output of the wavelength converter system.