Grating monochromator / spectrograph

A monochromator comprising:

• a. a primary reflector receiving input light and reflecting collimated input light;
• b. a grating receiving the collimated light and reflecting component light wavelengths of the collimated light at different angles;
• c. a nonplanar first secondary reflector receiving and reflecting the component light wavelengths;
• d. a nonplanar second secondary reflector receiving the reflected component light wavelengths and reflecting them onto a focal plane, wherein each light wavelength is focused onto a corresponding region of the focal plane.

A monochromator comprising:

• a. a primary reflector oriented to receive input light from an input aperture;
• b. a diffraction grating oriented to receive light reflected from the primary reflector;
• c. a first secondary reflector oriented to receive light reflected from the refraction grating;
• d. a second secondary reflector oriented to receive light reflected from the first secondary reflector;
• and
• e. a photosensitive detector oriented to receive light reflected from the second secondary reflector,
• wherein at least one of the paths of the light received by or reflected from the diffraction grating intersects at least one of the paths of the light received by or reflected from the second secondary reflector.