Laser Vibrometry

The vibrations of a surface can be measured by interfering a laser beam reflected from a vibrating surface with another beam and measuring the phase or frequency difference between the two beams.

STED Microscopy

Two seperate lasers are used. One laser beam excitese the molecules of the object and a second "doughnut" laser beam depletes all but the molecules at its middle before they are able to flouresce.

Optical Vortices for Data Transfer

An optical vortex can have an infinite number of states and could be used to transfer data at a much faster rate than with binary encoding.

Generating Ince-Gauss beams
A curved output coupler of a laser cavity has to be shifted and tilted off its original axis of curvature as explained here. Could be interesting to try.

Laser Microphone
A laser microphone could be built based on a laser doppler vibrometer, or simply by refelecting a beam of the vibrating surface and onto a photodetector.

Generating Airy Beams with Lenses

Generating Beam Modes with an SLM