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.
Verfasserangaben: | Aaron Schüller-Ruhl, Leonard Dinstühler, Thorsten Senger, Stefan Bergfeld, Christian Ingenhag, Robert Fleischhaker |
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DOI: | https://doi.org/10.1007/s00340-022-07928-2 |
ISSN: | 1432-0649 (Online) |
ISSN: | 0946-2171 (Print) |
Titel des übergeordneten Werkes (Englisch): | Applied Physics B |
Verlag: | Springer |
Verlagsort: | Berlin |
Herausgeber: | Jacob Mackenzie |
Dokumentart: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Erscheinungsjahr: | 2022 |
Datum der Publikation (Server): | 27.10.2022 |
Jahrgang: | 128 |
Ausgabe / Heft: | Article number: 208 |
Erste Seite: | 1 |
Letzte Seite: | 11 |
Bemerkung: | Corresponding author: Robert Fleischhaker |
Link: | https://doi.org/10.1007/s00340-022-07928-2 |
Zugriffsart: | weltweit |
Fachbereiche und Einrichtungen: | FH Aachen / Fachbereich Energietechnik |
open_access (DINI-Set): | open_access |
collections: | Verlag / Springer |
Open Access / Hybrid | |
Geförderte OA-Publikationen / DEAL Springer | |
Lizenz (Deutsch): | Creative Commons - Namensnennung |