{"id":147,"date":"2025-10-22T10:06:37","date_gmt":"2025-10-22T08:06:37","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?page_id=147"},"modified":"2025-12-03T21:06:35","modified_gmt":"2025-12-03T20:06:35","slug":"the-superradiant-laser-lab","status":"publish","type":"page","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/the-superradiant-laser-lab\/","title":{"rendered":"The superradiant laser lab"},"content":{"rendered":"\n
\"\"<\/span>
\n

The superradiant laser lab<\/h2>\n<\/div><\/div>\n\n\n\n

Under controlled conditions, the collective emission of light by an ensemble of emitters leads to intriguing effects, such as the spontaneous emergence of entanglement and altered emission properties. We will make use of the collective spontaneous emission phenomenon called super-radiance, with thousands of atoms inside an optical cavity, to create a source of light with ultrastable frequency and a linewidth even below that of individual emitters, a superradiant laser. This novel source of coherent light is of particular interest for frequency metrology, as it may be used as optical clocks with improved robustness to perturbations, and possibly reduced experimental complexity.<\/p>\n\n\n\n

A challenge for present-day super-radiant lasers is maintaining the emission continuously. The ambition of our project is to breach this milestone by continuously refilling the optical cavity with strontium atoms that were pre-excited on the intercombination transition. By using a simple thermal beam, we aim at establishing continuous operation in a relatively simple and robust design.<\/p>\n\n\n\n

\n
\n
\n
\"\"
In-vacuum cavity<\/figcaption><\/figure><\/div>
\"\"
Fluorescence of atom coming into the mode of the superradiant laser cavity.<\/figcaption><\/figure><\/div>
\"\"
The superradiant laser machine.<\/figcaption><\/figure><\/div>
\"\"<\/figure><\/div>
\"\"
The superradiant laser cavity sitting on its platform.<\/figcaption><\/figure><\/div>
\"\"
Blue (461nm) laser light distribution.<\/figcaption><\/figure><\/div>
\"\"
The bare vacuum chamber.<\/figcaption><\/figure><\/div><\/div>