Collaborative Project “HiPEQ”

HiPEQ - Highly integrated PIC-based ECDLs for quantum technology

In the joint project HiPEQ, the partners are developing precision components for use in quantum computers, quantum communication or quantum sensor technology.
© Fraunhofer ILT, Aachen, Germany.
In the joint project HiPEQ, the partners are developing precision components for use in quantum computers, quantum communication or quantum sensor technology.

The collaborative project "Highly Integrated PIC-based ECDLs for Quantum Technology" (HiPEQ) focuses on the development of an innovative platform for miniaturized single-mode and narrow-band diode lasers ("External Cavity Diode Laser", ECDL) based on photonic-integrated circuits (PIC) in the visible spectral range. Narrowband fully integrated lasers are needed in various quantum technology applications such as the realization of ion-based quantum computers, quantum communication as well as quantum sensing.

On the one hand, Fraunhofer ILT is working on the realization of laser-manufactured 3D precision components for the interface and connection components between the PIC and the fiber. The so-called selective laser-induced etching (SLE) process and laser polishing are used for this purpose. The SLE process offers a high spatial precision of about 1 µm as well as an almost complete freedom of geometry for the design of the components. As a result, a monolithic component can be produced and the adjustment effort for the components can be significantly reduced. In addition, it is also possible to manufacture a hermetically sealed system.

On the other hand, a monocrystalline optical isolator with a comparatively large Verdet constant is required for the realization of a miniaturized ECDL. Due to the high melting point of more than 2000°C, the crucible-free laser floating zone process is used for growing these insulator crystals, in which the nutrient rod and seed crystal are remelted in a locally confined area using multi-kW laser radiation. For this purpose, an optical system for beam shaping and guiding is being developed at Fraunhofer ILT in a second work package, which will be used together with a high-power diode laser to grow novel insulator crystals with large Verdet constants.

 

Duration of the project 

1.11.2021 - 31.10.2024

 

"HiPEQ" is a joint project of the Fraunhofer ILT with the following partners

TOPTICA Photonics AG

 

RWTH Lehrstuhl für
integrierte Photonik

 

IPH – Integrated Photonics

 

Surfacenet GmbH

 

 

Laserline GmbH

 

 

 

Electro-Optics Technology GmbH