Direct fabrication of arbitrary phase masks in optical glass via ultra-short pulsed laser writing of refractive index modifications

  • We study the possibility to fabricate an arbitrary phase mask in a one-step laser-writing process inside the volume of an optical glass substrate. We derive the phase mask from a Gerchberg–Saxton-type algorithm as an array and create each individual phase shift using a refractive index modification of variable axial length. We realize the variable axial length by superimposing refractive index modifications induced by an ultra-short pulsed laser at different focusing depth. Each single modification is created by applying 1000 pulses with 15 μJ pulse energy at 100 kHz to a fixed spot of 25 μm diameter and the focus is then shifted axially in steps of 10 μm. With several proof-of-principle examples, we show the feasibility of our method. In particular, we identify the induced refractive index change to about a value of Δn=1.5⋅10−3. We also determine our current limitations by calculating the overlap in the form of a scalar product and we discuss possible future improvements.

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Metadaten
Author:Aaron Schüller-Ruhl, Leonard Dinstühler, Thorsten Senger, Stefan Bergfeld, Christian Ingenhag, Robert Fleischhaker
DOI:https://doi.org/10.1007/s00340-022-07928-2
ISSN:1432-0649 (Online)
ISSN:0946-2171 (Print)
Parent Title (English):Applied Physics B
Publisher:Springer
Place of publication:Berlin
Editor:Jacob Mackenzie
Document Type:Article
Language:English
Year of Completion:2022
Volume:128
Issue:Article number: 208
First Page:1
Last Page:11
Note:
Corresponding author: Robert Fleischhaker
Link:https://doi.org/10.1007/s00340-022-07928-2
Zugriffsart:weltweit
Institutes:FH Aachen / Fachbereich Energietechnik
open_access (DINI-Set):open_access
collections:Verlag / Springer
Open Access / Hybrid
Geförderte OA-Publikationen / DEAL Springer
Licence (German): Creative Commons - Namensnennung