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Open AccessArticle

A Comparison between Nanogratings-Based and Stress-Engineered Waveplates Written by Femtosecond Laser in Silica

1
Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris Saclay, 91405 Orsay CEDEX, France
2
LPICM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France
3
HORIBA Europe Research Center, 91120 Palaiseau, France
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(2), 131; https://doi.org/10.3390/mi11020131
Received: 3 January 2020 / Revised: 20 January 2020 / Accepted: 21 January 2020 / Published: 24 January 2020
(This article belongs to the Special Issue Femtosecond Laser Micromachining for Photonics Applications)
This paper compares anisotropic linear optical properties (linear birefringence, linear dichroism, degree of polarization) and performances (absorption coefficient, thermal stability) of two types of birefringent waveplates fabricated in silica glass by femtosecond laser direct writing. The first type of waveplate is based on birefringence induced by self-organized nanogratings imprinted in the glass. One the other hand, the second design is based on birefringence originating from the stress-field formed around the aforementioned nanogratings. In addition to the provided comparison, the manufacturing of stress-engineered half waveplates in the UV-Visible range, and with mm-size clear aperture and negligible excess losses, is reported. Such results contrast with waveplates made of nanogratings, as the later exhibit significantly higher scattering losses and depolarization effects in the UV-Visible range. View Full-Text
Keywords: femtosecond laser processing; silica glass; birefringent devices; stress birefringence femtosecond laser processing; silica glass; birefringent devices; stress birefringence
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MDPI and ACS Style

Tian, J.; Yao, H.; Cavillon, M.; Garcia-Caurel, E.; Ossikovski, R.; Stchakovsky, M.; Eypert, C.; Poumellec, B.; Lancry, M. A Comparison between Nanogratings-Based and Stress-Engineered Waveplates Written by Femtosecond Laser in Silica. Micromachines 2020, 11, 131.

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