Patent ID: 7260127

Claim:
An emission apparatus comprising: a substrate; a first ionic crystal layer disposed over said substrate and having a plurality of color centers each associated with a given area on said first ionic crystal layer and arranged in a first pattern, said first pattern defined by a first set of selected areas on said first ionic crystal layer, and each of said plurality of color centers operative to be excited by light at a first given predetermined wavelength; a second ionic crystal layer disposed over said first layer and having a plurality of color centers each associated with a given area on said second ionic crystal layer and each operative to be excited by light at a second given predetermined wavelength different from said first wavelength and arranged in a second pattern, said second layer having an absorption energy greater than that of said first layer, said second pattern defined by a second set of selected areas on said second ionic crystal layer; wherein when light of said first wavelength is incident on said apparatus, color centers of said first ionic crystal layer lase at a first frequency and when light of said second wavelength is incident on said apparatus, color centers of said second ionic crystal layer lase at a second frequency.