Zoned blaze broadband gratings mosaicked using a device made from high-stability special materials

Broadband gratings are fundamental optical components in broadband spectral instruments. Herein, the complexity and cost of fabrication methods are addressed by zoned blazed broadband grating fabrication via mosaicking technology. A blaze angle calculation method and zoned grating structural parameters are established and designed. Steps for 5D mosaicking error separation and correction are established via analysis and simulations. Accordingly, a highly stable mosaicking-error-adjustment device made of special materials is designed, and a grating is fabricated. The grating wavelength range is 200-1100 nm, the diffraction wavefront is better than λ/4, and the diffraction efficiency exceeds 30% in 90% of the blaze band.