Internet address(es):

Main address: www.au.dk

Purchasing of a Laser System

Aarhus University wants to buy a combined laser system for research purposes. The aim of the research is to construct a novel laser box potential, which will provide us with a homogeneous bath for the investigation of the polaron.

The general scenario of a mobile impurity particle interacting with its surroundings is of fundamental importance in many fields of physics. Such an impurity particle bound to excitations in the surrounding medium is called a polaron and plays a crucial role in solid-state physics. It is thus highly desirable to understand the scenario of an impurity immersed in a medium and potentially a larger range of such quasiparticles. Ultracold quantum gases provide an excellent setting to do so, since they allow for quantum simulation of this scenario. A quantum gas is usually created and studied by using magnetic and optical fields to manipulate and cool atoms. At sufficiently low temperatures the fundamental quantum nature of particles allows the creation of so-called bose-einstein condensates. In this state a dilute gas of atoms condenses into a collective state of matter governed by quantum mechanics. Ultracold gases are often trapped by laser light, but due to the light intensity distribution of common traps the features of the polaron (e.g. energy, mass) are broadened. The aim of the research is therefore to construct a novel laser box potential, which will provide us with a homogeneous bath for the investigation of the polaron.

A single laser source which can provide light at 1064 nm and 532 nm is required. This will allow us to provide both attractive and repulse potentials for the atomic clouds under investigation.

The instrument must have the following specifications.

— 20W of single-mode single frequency radiation at a wavelength of 1064 nm,

— 10W of single-mode single frequency radiation at a wavelength of 532 nm,

— singe longitudinal mode radiation at both frequencies,

— single transverse mode at both frequencies,

— high power stability – short term < ± 0.3 %,

— drift < 50 MHz over 8 hours.

Aarhus University wants to buy a combined laser system. After a thorough marked analysis we can conclude that only one manufacturer can deliver the combined laser system, that is able to meet our needs to the described system.

Internet address: https://erhvervsstyrelsen.dk/klagenaevnet-for-udbud