How lasers are different from ordinary light #physics #laser #light

追加: 2026-06-03

[00:00:00]To understand what makes laser light so special, it makes sense to look at an ordinary light bulb, the old-fashioned kind with a tungsten filament. It produces light through thermal radiation.

[00:00:15]An electric current passing through the filament heats it up.

[00:00:20]Its tungsten atoms become excited and vibrate at different speeds, which causes them to emit photons in all directions across a variety of wavelengths.

[00:00:34]Compared to a laser, this is chaos.

[00:00:40]>> The way you should think about a light bulb is something like they're just a mob of people all singing at different pitch. So, it's like a rock concert audience.

[00:00:51]But a laser, a laser is more like if you go to Giuliard or Berkeley School of Music and you go to a concert, it's like a choir of people who have got perfect pitch, but it's a choir of something like a million trillion people singing at the same time, the same tone.