US 12,078,928 B2
Diffractive optical element fabrication
Nitesh Gulati, Rosebery (AU); Vincent Choo, Rosebery (AU); Yiwei Xu, Rosebery (AU); Glenn Wayne Baxter, Hornsby Heights (AU); and Steven James Frisken, Vaucluse (AU)
Assigned to II-VI DELAWARE, INC., Wilmington, DE (US)
Filed by II-VI Delaware, Inc., Wilmington, DE (US)
Filed on Feb. 18, 2022, as Appl. No. 17/651,699.
Application 17/651,699 is a division of application No. 16/382,137, filed on Apr. 11, 2019, granted, now 11,300,874.
Claims priority of provisional application 62/657,739, filed on Apr. 14, 2018.
Prior Publication US 2022/0171282 A1, Jun. 2, 2022
Int. Cl. G03F 7/00 (2006.01); G02B 3/00 (2006.01); G02B 5/18 (2006.01)
CPC G03F 7/0005 (2013.01) [G02B 3/0012 (2013.01); G02B 3/0018 (2013.01); G02B 5/1814 (2013.01); G02B 5/1857 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A diffractive optical element including:
a monolithic prism;
an input surface of the monolithic prism configured to receive an input optical signal;
a diffractive surface of the monolithic prism adapted to spatially disperse the input optical beam into a dispersed signal;
an output surface of the prism configured to output the dispersed signal;
wherein the input surface and the diffractive surface are non-parallel; and
wherein the diffractive surface is formed in situ in the same monolithic prism as the input surface and the output surface by a photolithographic technique.