Mid-infrared tunable filter based on a femtosecond-written silica volume Bragg grating.
Opt Lett
; 49(13): 3745-3748, 2024 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-38950257
ABSTRACT
A silica volume Bragg grating (VBG) is used to filter the light of a mid-infrared (mid-IR) supercontinuum laser. The VBG with a 7 µm period was inscribed with 800 nm pulses with a 100 fs duration and the phase-mask technique over a glass thickness of 3 mm. Despite silica's absorption, the VBG allows obtaining a narrowband light source tunable from 2.9 to 4.2 µm with a full width at half maximum (FWHM) of 29 nm. This demonstrates the great potential of using femtosecond-written VBGs as highly tunable, yet selective, spectral filters in the mid-IR.
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MEDLINE
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En
Ano de publicação:
2024
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Article