Method and apparatus for preparing femtosecond optical filament interference direct writing volume grating/chirped volume grating
US11899229B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 14, 2021 |
| Grant date | Feb 13, 2024 |
| Priority date | — |
| Expiry date | Jul 8, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present disclosure discloses a method and apparatus for preparing a femtosecond optical filament interference direct writing volume grating/chirped volume grating. The method is characterized in that optical filaments are formed in glass by using femtosecond pulse laser, and plasma is controlled to quickly scan in the glass and etch a volume grating or chirped volume grating structure by adjusting the focal length of convex lens, laser energy and movement of motor machine. The apparatus includes a femtosecond pulse laser module, a pulse chirp management module, a pulse time domain shaping module, a laser separation and interference module, a glass volume grating processing platform module and a camera online imaging module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.