Hot/Cold Mirror Designer

Design a quarter-wave HRI/LRI dichroic stack for a chosen IR or visible cutoff.

From cutoff wavelength (slider 400–1100 nm), target reflection %, substrate RI, mirror type, and H/L indices, computes per-pair reflection, the required pair count via log ratio, individual layer thicknesses d_H = λ/(4·n_H) and d_L = λ/(4·n_L), total layer count, and total stack thickness — anchored to Kriya HRI 1.95 + LRI 1.25.