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The active laser medium (also called a gain medium or lasing medium) is the source of optical gain within a laser. The gain results from the stimulated emission of photons through electronic or molecular transitions to a lower energy state from a higher energy state previously populated by a pump source. Examples of active laser media include:
Er:YAG laser rod. An Er:YAG laser (erbium-doped yttrium aluminium garnet laser, erbium YAG laser) is a solid-state laser whose active laser medium is erbium-doped yttrium aluminium garnet (Er:Y 3 Al 5 O 12). Er:YAG lasers typically emit light with a wavelength of 2940 nm, which is infrared light. [1]
As in all neodymium-doped laser crystals, the lasing action of Nd:YVO 4 is due to its content of neodymium ions, which may be excited by visible or infrared light, and undergo an electronic transition resulting in emission of coherent infrared light at a lower frequency, usually at 1064 nm (other transitions in Nd are available, and can be ...
The ruby laser is a three level solid state laser. The active laser medium (laser gain/amplification medium) is a synthetic ruby rod that is energized through optical pumping, typically by a xenon flashtube. Ruby has very broad and powerful absorption bands in the visual spectrum, at 400 and 550 nm, and a very long fluorescence lifetime of 3 ...
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The YLF crystal (LiYF 4) is naturally birefringent, and commonly used laser transitions occur at 1047 nm and 1053 nm. [1] It is used in Q-switched systems in part due to its relatively long fluorescence lifetime. As with Nd:YAG lasers, harmonic generation is frequently employed with Q-switched Nd:YLF to produce shorter wavelengths.
Whether he's a fly fisher, bank fisher, kayak fisher, or boat fisher, there are a few things he'll bring every time he goes out: a rod, a reel, line, and lures. I've included none on this list ...
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