Fs laser written volume Raman-Nath grating for integrated spectrometer on smartphone.

ABSTRACT: In this work we demonstrate the integration of a spectrometer directly into smartphone screen by femtosecond laser inscription of a weak Raman-Nath volume grating either into the Corning Gorilla glass screen layer or in the tempered aluminosilicate glass protector screen placed in front of the phone camera. Outside the thermal accumulation regime, a new writing regime yielding positive refractive index change was found for both glasses which is fluence dependent. The upper-bound threshold for this thermal-accumulation-less writing regime was found for both glasses and were, respectively at a repetition rate less than 150 kHz and 101 kHz for fluence of 8.7 × 10⁶ J/m² and 1.4 × 10⁷ J/m². A weak volume Raman-Nath grating of dimension 0.5 by 3 mm and

SUBMITTER: Boisvert JS 

PROVIDER: S-EPMC10444826 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature