We made an experiment showing that a second harmonic generation can happen not only in non-linear crystals but also in liquids.
We launched the laser on 99% power on a metal piece through the acetic acid.
The laser beam in unfocused (+-1-3 mm) [facal range is 80 mm]
The green flash happens ever 1-2 seconds.
For an experiment we used:
- an old HDD disk
- an acetic acid (9%)
- a 10 watt Endurance DPSS laser module (Nd:YAG 1064 nm, 7-10 ns pulse width, Frequency: 25-30 kHz, laser beam spot 40 uM, TTL power: 99%)
For an effect detection we used:
A mirror Canon 60D camera with 15-85 lens (max zoom) + green filter
Ultra-fast snapshot.
Red flashes (1064 / 808 nm)
Green flashes (~532 nm)
Original images (ZIP file) >>>
A video of the experiment
About an Endurance 10 watt DPSSL
An Endurance Brand New DPSS Laser Module For Metal Marking & Metal Cutting!
Endurance have started to work on SHG (532 nm), THG (355 nm), FHG (266 nm)