Laser Crystal Fundamentals Explained
Laser Crystal Fundamentals Explained
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Laser modeling and simulation can be employed to reliably establish the ideal crystal dimensions, doping density And maybe values of supplemental parameters.
The medium should have a substantial transparency (low absorption and scattering) while in the wavelength locations of pump and laser radiation, and good optical homogeneity. To some extent, this is dependent upon the standard of the material, determined by specifics with the fabrication procedure.
The host medium influences strongly the wavelength, bandwidth and changeover cross-sections of pump and laser transitions in addition to the higher-point out life span.
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For quasi-3-degree laser acquire media or even a few-stage obtain media, 1 normally ought to limit the length to a worth which can be as well shorter for successful pump absorption, as reabsorption results would otherwise spoil the general performance. For aspect pumping, additional criteria arrive into play; Moreover effective pump absorption, it is important to get a suitable spatial form of the achieve profile.
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A significant problems threshold with regards to pulse fluence or peak intensity is often essential for prime-energy amplifiers.
作为工业上使用较多的都是高掺钇铝石榴石，也就是说掺入不同的元素来达到不同的效果；作为工业激光，关注以下性能：
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It might be oriented for around perpendicular incidence with the laser beam, or at Brewster's angle. It might be preset in some solid mount which also acts as being a heat sink. Bigger crystals are generally utilized for side pumping e.g. with higher-energy diode bars.
The commonest laser-Energetic unusual earth ions and host media together with some typical emission wavelengths are revealed in the next table:
All those surfaces which can be handed through the laser beam are normally both oriented at Brewster's angle or have an anti-reflection coating.
Of course, it is very attractive that a supplied crystal excellent is produced constantly, While different laser styles may have a unique sensitivity to product parameters.
There's an array of crystalline media, which may be grouped in accordance to special atomic constituents and crystalline buildings. Some vital teams of crystals are:
With that concept, a person will not want an extra saturable absorber crystal, making sure that just one may well make extra compact Q-switched laser setups with lessen interior parasitic losses. Having said that, unwelcome side effects may also occur, which include getting undesired valence states on the concerned ions or Vitality transfers.
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Laser crystals are optical crystals �?ordinarily single crystals (monocrystalline optical elements) �?which are utilised as attain media for strong-condition lasers. Most often, They're doped with both trivalent exceptional earth ions or changeover metallic ions.
激光晶体（laser crystal），可将外界提供的能量通过光学谐振腔转化为在空间和时间上相干的具有高度平行性和单色性激光的晶体材料。是晶体激光器的工作物质。