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Proceedings Paper

Direct laser writing of double track waveguides inside calcium fluoride crystals (Conference Presentation)
Author(s): Wendwesen Gebremichael; Inka B. Manek-Hönninger; Yannick G. Petit; Sophie Rouzet; Clemens Hönninger; Lionel Canioni
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Paper Abstract

Calcium Fluoride (CaF2) was identified among the first host crystals for active laser media. However, due to the need of charge compensation of Nd3+-doped fluorite crystal structures, other host materials like YAG, oxide and fluorite glasses were preferred over the years. Recent developments made on ytterbium-doped alkaline-earth fluorides have shown that it is possible to have better scalability of crystal growth, very high thermal conductivity, high laser-induced damage threshold, longer emission lifetime, lower nonlinear refractive index and large emission wavelength tuning range. Due to these reasons, Yb-doped CaF2 has once again proved to be a competitive material for high-energy and high-power operations. Waveguides confine light propagation resulting in reduced lasing thresholds and enhanced laser efficiencies. By properly managing the three-dimensional translation of the focal volume of pulsed lasers, it is possible to create waveguides and other 3D structures inside crystals. Recently, depressed cladding waveguides written inside CaF2 were reported. In this work, we will present the first, to the best of our knowledge, double track waveguides inscribed inside doped and undoped CaF2 crystal with different pulse energies. Waveguide characterization, determination of mode-field diameter, analysis of polarization dependent guiding and also direct refractive index change measurements of the waveguides were performed and will be presented. Additionally, single pass gain and lasing experiments will be demonstrated both theoretically and experimentally.

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 105190V (14 March 2018); doi: 10.1117/12.2289876
Show Author Affiliations
Wendwesen Gebremichael, Univ. Bordeaux 1 (France)
Amplitude Systèmes (France)
Inka B. Manek-Hönninger, Ctr. Lasers Intenses et Applications (France)
Yannick G. Petit, Institut de Chimie de la Matière Condensée de Bordeaux (France)
Ctr. Lasers Intenses et Applications (France)
Sophie Rouzet, Ctr. Lasers Intenses et Applications (France)
Clemens Hönninger, Amplitude Systèmes (France)
Lionel Canioni, Ctr. Lasers Intenses et Applications (France)


Published in SPIE Proceedings Vol. 10519:
Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII
Beat Neuenschwander; Costas P. Grigoropoulos; Tetsuya Makimura; Gediminas Račiukaitis, Editor(s)

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