Quantum Theory of Nano-Lasers

NATIF project

The project is aimed at the development of novel low-noise semiconductor lasers by investigating the properties of noise in unconventional systems and its fundamental limitations.

Different parallel avenues will be explored, by diversifying the systems studied (spontaneous emission controlled nanolasers and VECSELs) and by furthering the understanding of the underlying physics.

  • Spontaneous emission controlled nanolasers are coherent light sources in which the fraction of spontaneous emission into the lasing mode is high. In such high lasers, the damped relaxation oscillations (http://www.rp-photonics.com/relaxation_oscillations.html) should disappear, allowing to turn the semiconductor laser to a low noise Class B nanolaser.
  • Quiet lasers such as VECSELs are ideal systems to explore intensity noise properties in semiconductor lasers, since their dynamical behavior can be continuously modified from the class B to the class A regime. Yet, frequency noise characterization in such lasers is still a serious problem, being very important for precision spectroscopy applications. Moreover, some applications such as compact atomic clocks require two wavelength lasers. However, noise characteristics, and mode coupling in unconventional two-polarization VECSELs are still unknown. At present, the issues concerning quantum correlations between the two oscillating frequencies are completely an open field.

The new knowledge generated within the project will open new directions for laser technology. It may lead to a technological breakthrough in the engineering of low-noise lasers with widespread potential applications as for instance microwave photonics, metrology, spectroscopy or free space telecommunications. Moreover, noise characteristics in novel nanolasers is a key element in the route towards future nanoscale devices.

The project brings together partners with complementary expertise and unique experience who have already achieved major breakthroughs in this field: LPN (UPR20, Marcoussis), IES (UMR 5214, Montpellier), LAC (UPR 3321, Orsay) and Phlam (UMR 8523, Villeneuve d'Ascq).