NOVELTY - Forming an optical device comprises: providing a glass carrier having a first surface (106); forming an optic structure in an at least partially transmissive layer (104) that is adjacent the first surface of the glass carrier; and curing the transmissive layer using a thermal ramp up to a cure temperature at or within 100 degrees C of an operating temperature of the optical device.    USE - The method is useful for forming an optical device that is useful in a system (claimed) which is a concentrator photovoltaic apparatus.    ADVANTAGE - The method: lowers manufacturing costs; increases the amount of product that can be manufactured in a period of time without additional capital expenditures, while maintaining the facet geometry and fidelity of the optic; can be used in many applications, such as those requiring high heat (e.g. stage lighting) where traditional plastic lenses will not suffice; provides high performance, optimized lenses which compensate for high cure temperatures and cure rates which cause changes in dimension or facet rounding, with shorter cycle times and increased cure rates with a minimal spot diameter at a nominal focal length for one wavelength of light; and provides concentrator photovoltaic apparatus with increased tolerance to tracking error, improved irradiance uniformity on the photovoltaic cell, improved efficiency over a broad spectral range, increased concentration ratio, and improved allowance for assembly tolerances.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) an optical device comprising a glass carrier having a first surface, and an at least partially transmissive layer adjacent the first surface of the glass carrier, where the transmissive layer forms an optic structure and is cured using the thermal ramp; and    (2) a system comprising an array of optical devices and an array of photovoltaic cells configured with respect to the array of optical devices to convert light energy passing through the array of optical devices into electricity.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of an optical device.    Lens (100)    Transmissive layer (104)    First surface (106)    Second surface (108)    Slope facets (110)