The third is stimulated emission
also described by Einstein's coefficient [B.
On the other hand, for high current, when the current is switched off, the number of existing carriers is high enough to increase the rate of stimulated emission
and as a result, the fall time decreases.
One technique merges SMI and stimulated emission
depletion to yield subdiffraction imaging with a method termed nonlinear structured illumination.
En 1954, Townes, Gordon y Zeiger tenian el primer maser (Microwave amplification by stimulated emission
of radiation), que operaba en la Universidad de Columbia.
Laser means Light Amplification by Stimulated Emission
ANSWERS: 1 Shetland pony or sheepdog; 2 Lorna Doone; 3 King Of The Road; 4 Frans Hals; 5 Richard Burton; 6 Iraq; 7 Hewlett-Packard; 8 Kevin & Perry Go Large; 9 Light Amplification by Stimulated Emission
of Radiation; 10 Yitzhak Rabin.
I know that laser is Light Amplification of Stimulated Emission
of Radiation, and most of us use it in our DVDrecorders and players, among other uses such as sight correction surgery etc.
Many years ago, when people were playing with microwaves and radar, it was discovered that it was possible to 'tune' the microwave radiation, and gadgets were invented called MASERS - 'Microwave Amplification by the Stimulated Emission
The word LASER, now common, is actually an acronym for Light Amplification by Stimulated Emission
These crystals have a large stimulated emission
cross section at laser wavelength and a high absorption coefficient and wide bandwidth at pump wavelength, but they have a low dependency on pump wavelength and produce a strongly polarized laser output.
No one will be threatening any Star Fleet officers with the device, but the uaser (from "ultrasound amplification by stimulated emission
of radiation," and pronounced "WAY-zer") might someday find its way into materials research laboratories.
All that is required appears to be (1) transitions within two states, (2) absorption, (3) spontaneous emission, and (4) stimulated emission