Compact imaging spectrometer utilizing immersed gratings

A compact imaging spectrometer apparatus, comprising:

• an entrance slit for transmitting light,
• a dioptric lens,
• a prism,
• a reflective grating, and
• a detector array,
• said entrance slit, said dioptric lens, said prism, said reflective grating, and said a detector array positioned wherein
• said entrance slit transmits light to said to said dioptric lens and
• said dioptric lens directs said light to said prism and
• said prism receives the light and directs to said reflective grating,
• said reflective grating directs said light to said dioptric lens, prism, and detector array.

A compact imaging spectrometer apparatus, comprising:

• an entrance slit for transmitting light,
• a catadioptric lens for directing light,
• an immersed mirror surface on said catadioptric lens,
• a rotational asphere on said catadioptric lens,
• a reflective grating for directing light, and
• a detector array,
• said entrance slit, said catadioptric lens, said immersed mirror surface, said reflective grating, said rotational asphere, and said detector array are positioned wherein
• said entrance slit transmits light to said catadioptric lens, the said light is transmitted through said rotational asphere to said immersed mirror surface, said immersed mirror surface reflects the said light out through said rotational aspheric to said reflective grating, said reflective grating directs and disperses the said light back to said catadioptric lens and the said light enters said catadioptric lens through said rotational aspheric and exits said catadioptric lens, and said catadioptric lens focuses and directs the said light to said detector array.