High-efficiency broadband polarization-independent binary fused silica gratings for large astronomical telescopes.
Appl Opt
; 60(31): 9925-9932, 2021 Nov 01.
Article
en En
| MEDLINE
| ID: mdl-34807182
ABSTRACT
The binary fused silica gratings (BFSGs) with high diffraction efficiency are presented for large astronomical ground-based telescopes. Calculations demonstrate that the BFSGs could obtain high diffraction efficiency in a wider wavelength range and angle of incident (AOI) range compared with volume phase holographic gratings. Several gratings with a size of 60mm×60mm have been fabricated by holographic lithography and reactive ion-beam etching technology. The measured peak diffraction efficiency reaches 94%, and results show that there are 130 nm wavelength bandwidth and 12° AOI bandwidth in which diffraction efficiency is higher than 70%. The stray light causes the diffraction efficiency to decrease by about 0.48%. All measurements have indicated good consistency with the simulation results.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Appl Opt
Año:
2021
Tipo del documento:
Article