Spectrally-selective optical element

An optical system comprising:

• a first optical element in an optical path of an optical beam, the first optical element comprising:
• a first optical material structure comprising a first index of refraction across a frequency spectrum;
• a second optical material structure configured to exhibit a first index anomaly corresponding to a change in index of refraction from the first index of refraction to a second index of refraction across a first portion of the frequency spectrum and a change from the second index of refraction to the first index of refraction along the frequency spectrum;
• and
• a first diffractive interface corresponding to a first non-planar material contact junction between the first optical material structure and the second optical material structure, the first diffractive interface being configured to manipulate in a predetermined manner the optical beam and having a frequency in the first portion of the frequency spectrum;
• and
• a second optical element in the optical path of the optical beam, the second optical element comprising:
• a third optical material structure comprising the first index of refraction across the frequency spectrum;
• a fourth optical material structure configured to exhibit a second index anomaly corresponding to a change in index of refraction from the first index of refraction to a third index of refraction across a second portion of the frequency spectrum and a change from the third index of refraction to the first index of refraction along the frequency spectrum;
• and
• a second diffractive interface corresponding to a second non-planar material contact junction between the third optical material structure and the fourth optical material structure, the second diffractive interface being configured to manipulate in a predetermined manner the optical beam and having a frequency in the second portion of the frequency spectrum.

An optical element comprising:

• a plurality of optical substrate pairs comprising a respective plurality of complementary geometric beam control interfaces therebetween, each of the optical substrate pairs comprising:
• a first optical substrate with a predetermined index of refraction dispersion curve over a first transmissive spectral range;
• a second optical substrate which exhibits an index anomaly relative to the first substrate over a second transmissive spectral range within the first transmissive spectral range, the second optical substrate having an approximately same dispersion as the first optical substrate outside of the second transmissive spectral range;
• and
• a complementary geometric beam control interface between the first and second optical substrates corresponding to a non-planar material contact junction between the first optical material structure and the second optical material structure, the complementary geometric beam control interface being configured to manipulate in a predetermined manner an optical beam having an optical path through the interface;
• wherein the second transmissive spectral range associated with each of the plurality of optical substrate pairs is non-overlapping with the second transmissive spectral range of each other one of the optical substrate pairs.