Spatially varying skew mirrors

An optical reflecting device comprising:

• a grating medium;
• a grating structure occupying a volume within the grating medium, wherein:
• the grating structure is structured to reflect incident light having a first wavelength and a first range of incidence angles about a substantially uniform first reflective axis, the incident light being incident upon a surface of the grating medium at a first location;
• the grating structure is structured to reflect incident light having a second wavelength and a second range of incidence angles about a substantially uniform second reflective axis, the light being incident upon the surface of the grating medium at a second location;
• and
• the substantially uniform first reflective axis differs from the substantially uniform second reflective axis by at least 0.1 degrees.

An optical reflecting device comprising:

• a grating medium;
• a grating structure occupying a volume within the grating medium, wherein:
• the grating structure is structured to reflect a wavelength of incident light having a first range of incidence angles, the first range of incidence angles spanning at least 15 degrees, wherein:
• the incident light is incident upon a surface of the grating medium at multiple locations;
• at each of the multiple locations, the wavelength of incident light is reflected about a substantially uniform reflective axis;
• and
• the substantially uniform reflective axis at each of the multiple locations differs from the substantially uniform reflective axis of at least one other of the multiple locations by more than 0.1 degrees.

An optical reflective device comprising:

• a grating medium;
• a grating structure residing in the grating medium, wherein:
• the grating structure is structured to principally reflect incident light having a first wavelength as reflected light having the first wavelength;
• the incident light and the reflected light form a first angle bisected by a first reflective axis at a first location of the grating medium and a second angle bisected by a second reflective axis at a second location of the grating medium;
• the first reflective axis is substantially uniform and the second reflective axis is substantially uniform where the incident light has a range of angles of incidence of at least 15 degrees;
• the first reflective axis differs from a surface normal of the grating medium by at least 2.0 degrees;
• and
• the second reflective axis differs from the first reflective axis by at least 0.1 degrees.

An optical reflective device comprising:

• a grating structure residing in a grating medium, wherein:
• the grating structure is structured to principally reflect incident light as reflected light;
• the incident light and the reflected light form a first angle bisected by a reflective axis;
• the reflective axis forms a second angle with a surface normal of the grating medium;
• the second angle varies as a function of position within the grating medium;
• and
• at any one position within the grating medium the reflective axis varies by less than 0.10 degree where the incident light has a range of angles of incidence of at least 15 degrees.