Alfred Kastler
Videos
Alfred Kastler was a German-born French physicist and Nobel laureate in Physics. He is known for the development of optical pumping.
Kastler in 1966
Kastler ca. 1967
Laser
Videos
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser originated as an acronym for light amplifi
Alfred Kastler
…combination of optical resonance and magnetic resonance, developed the technique of "optical pumping". Those works led to the completion of the theory of lasers and masers. In 1962, he received the first C.E.K Mees Medal from the Optical Society of America, and he was elected an Honorary member of the Society…
A telescope in the Very Large Telescope system producing four orange laser guide stars
A laser can produce a very narrow beam of light of a single wavelength, in this case, green.
A helium–neon laser demonstration. The glow running through the center of the tube is an electric discharge. This glowing plasma is the gain medium for the laser. The laser produces a tiny, intense spot on the screen to the right. The center of the spot appears white because the image is overexposed there.
Red (660 & 635 nm), green (532 & 520 nm), and blue-violet (445 & 405 nm) lasers