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Open AccessFeature PaperArticle

Femtosecond Laser Written Depressed-Cladding Waveguide 2 × 2, 1 × 2 and 3 × 3 Directional Couplers in Tm3+:YAG Crystal

1
Quantum Technologies Center and Faculty of Physics, Lomonosov Moscow State University, Leninskie gory 1, building 35, Moscow 119991, Russia
2
Moscow Institute Physics and Technology, Institutskiy per. 9, Dolgoprudny 141701, Russia
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 1; https://doi.org/10.3390/mi11010001
Received: 8 November 2019 / Revised: 11 December 2019 / Accepted: 13 December 2019 / Published: 18 December 2019
(This article belongs to the Special Issue Femtosecond Laser Micromachining for Photonics Applications)
Ion-doped crystal-based compact devices capable of beam splitting and coupling are enthralling for a broad range of classical and quantum integrated photonics applications. In this work, we report on the fabrication of depressed-cladding waveguide 2D 2 × 2, 1 × 2 and 3D 3 × 3 directional couplers in Tm 3 + :YAG crystal by femtosecond laser writing. The performances of the couplers are characterized at 810 nm, showing single-mode guidance, polarization independence, finely matched splitting ratios. These results open up new opportunities in the beneficial fabrication of 3D circuits and devices in crystals. View Full-Text
Keywords: femtosecond laser writing; depressed-cladding waveguide; directional coupler; yttrium aluminum garnet; crystal; integrated photonics, quantum memory femtosecond laser writing; depressed-cladding waveguide; directional coupler; yttrium aluminum garnet; crystal; integrated photonics, quantum memory
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MDPI and ACS Style

Skryabin, N.; Kalinkin, A.; Dyakonov, I.; Kulik, S. Femtosecond Laser Written Depressed-Cladding Waveguide 2 × 2, 1 × 2 and 3 × 3 Directional Couplers in Tm3+:YAG Crystal. Micromachines 2020, 11, 1.

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