Bubble laser

These bubble lasers have been made of dye-doped soap solutions and smectic liquid crystal.

[1] Uniquely, bubble lasers exhibit hundreds of regularly spaced resonant frequencies called whispering gallery modes, named for the Whispering Gallery in St. Paul's Cathedral in London.

[3] The spacing of whispering gallery modes is directly related to the bubble's circumference.

Bubble lasers have measured pressure changes as high as 100 bar (10,000 kPA) and as low as 1.5 Pa, an "exceptionally large" dynamic range, far outperforming other pressure sensors of comparable size.

[2] In the future, bubble lasers may be used to study thin films and phenomena such as Cavity optomechanics.

In a soap bubble, thin-film interference and constant thickness variations produces swirling iridescence . Likewise, thickness variations in bubble lasers contribute to an unstable frequency spectrum , prompting scientists to look for alternative bubble liquids. [ 1 ]