PhD position semiconductor-dielectric hybrid lasers with extreme temporal coherence

Duration: 48 months

Application Deadline: application is open until position is filled

Job Description
The Laser Physics and Nonlinear Optics group (LPNO) in the University of Twente, the Netherlands, is seeking for a PhD student to carry out research on hybrid integrated semiconductor-silicon nitride lasers. The work is embedded in a European research program with various academic and industrial partners, which aims on realizing novel photonic integrated circuits for optical switching, remote sensing and ranging.

The research group performs leading research on spectral control of hybrid semiconductor lasers using optical feedback from low-loss dielectric waveguides circuits (hybrid integration). The project will focus on various laser physics and technological aspects, such as to reduce the Schawlow-Townes linewidth to sub-kHz (and sub-100Hz) record levels. Wavelength tuning and stabilization strategies will be developed and novel approaches devised in feedback waveguide circuits for unidirectional, modulated or mode-locked operation.

The research methods are mainly experimental, but need a solid theoretical and modeling background, for instance, detailed characterization of coherence and intensity noise, stabilization with electronic feedback and sub-shot noise drive currents. State of the art feedback waveguide circuits have to be devised, for fabricated by one of the industrial partners (Lionix International, on campus).

Innovative design of hybrid lasers requires developing a deeper understanding of the fundamental dynamics of external cavity diode lasers, as well as of light propagation in complex dielectric waveguide circuits. The latter is to be built up via analytical and numerical modeling, which includes simulations with commercially available software.

Your Profile
We are looking for a highly motivated and excellent PhD candidate with a background in photonics, physics, applied physics, photonics engineering, optical engineering, opto-electronics, microwave photonics, or related areas. In particular, involvement in one or more of the following topics is desired:
Experimental characterization or modulation of diode lasers
Experimental evaluation of phase and intensity noise in lasers
Frequency stabilization of diode lasers
Modeling of integrated waveguide circuits and photonic devices
Modeling of external cavity continuous-wave diode lasers

English language proficiency is strictly required. Curiosity and strong scientific communication skills are desired. A scientific presentation will be part of the interview process.

Our offer
We want you to play a key role in an ambitious project in an inspiring international environment with highly competitive research. We offer:
A PhD position for four years, full time with a probationary period of one year
Excellent mentorship, a stimulating research environment, and world-class research facilities.
Various professional and personal development programs
A green and lively campus, with lots of sports facilities and other activities

About the group
The Laser Physics and Nonlinear Optics group (LPNO) explores the physics and technology of nonlinear optical processes and lasers with emphasis on nanophotonic approaches. This includes a wide range of light intensities and time scales, research on novel light sources, that are of importance for emerging photonic technologies, such as in telecommunications (integrated microwave photonics), precision metrology or optical sensing. The research currently includes integrated nonlinear optics, integrated quantum optics, and integrated laser physics. The group participates in strategic alliances with various partners, including the Applied Nanophotonics (ANP) Research Cluster and the MESA+ Institute for Nanotechnology.

Application procedure
Potential applicants are encouraged to discuss the project with Prof. Klaus Boller, ( prior to submitting applications.

Applications need to include the following documents:
A one-page motivation why you apply for this position,
A detailed CV (resume) with a publication list,
An academic transcript of B.Sc. and M.Sc. education.
A high TOEFL (> 90 or 100) or IELTS (> 6.5 or 7) score, generally requested

Applications should be sent to:
Laser Physics and Nonlinear Optics (LPNO)
Attn. Ms. Edith van Eijk (secretary)