Laser Crystal - An Overview
Laser Crystal - An Overview
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Various crystalline elements are quite different relating to their hardness along with other Attributes, which figure out with which strategies And just how easily they are often Slice and polished with top quality.
The medium should have a significant transparency (low absorption and scattering) within the wavelength areas of pump and laser radiation, and fantastic optical homogeneity. To some extent, this depends upon the caliber of the material, determined by facts of the fabrication method.
The host crystal is way more than simply a means to fix the laser-active ions at specific positions in Room. A variety of Attributes of the host material are important:
激光晶体由发光中心和基质晶体两部分组成。大部分激光晶体的发光中心由激活离子构成，激活离子部分取代基质晶体中的阳离子形成掺杂型激光晶体。激活离子成为基质晶体组分的一部分时，则构成自激活激光晶体。
The maximum doable doping concentration can rely strongly on the host content and its fabrication process.
g. a thin disk. As A different example, Q-switched lasers get to a higher populace density from the upper laser degree and so are therefore far more delicate to quenching effects and Strength transfer procedures; consequently, a decrease doping density is commonly appropriate for these gadgets. For prime-ability lasers, lower doping densities are frequently accustomed to Restrict the density of warmth technology, although thin-disk lasers perform ideal with remarkably doped crystals. Lots of laser products don't reach the total efficiency likely mainly because these types of aspects haven't been adequately labored out.
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A superior damage threshold with regard to pulse fluence or peak intensity might be essential for prime-Power 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：
Which geometry, dopant and doping concentration from the acquire medium are most useful count on various components. The available pump supply (variety of laser diode or lamp) and also the envisaged pumping arrangement are crucial factors, but the material by itself also has some affect. For example, titanium–sapphire lasers must be pumped with substantial intensities, for which the shape of the transversely cooled rod, operated with somewhat small pump and laser beam diameter, is more appropriate than e.
It might be oriented for near perpendicular incidence with the laser beam, or at Brewster's angle. It might be fastened in some solid mount which also acts for a heat sink. Much larger crystals usually are utilized for side pumping e.g. with higher-power diode bars.
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Individuals surfaces which can be handed through the laser beam are Commonly possibly oriented click here at Brewster's angle or have an anti-reflection coating.
Naturally, it is vitally fascinating that a specified crystal high quality is manufactured continuously, Though various laser styles can have another sensitivity to material parameters.
There's an array of crystalline media, that may be grouped according to big atomic constituents and crystalline structures. Some vital teams of crystals are:
With that concept, 1 won't need to have an extra saturable absorber crystal, to ensure that a single may perhaps make far more compact Q-switched laser setups with lower inside parasitic losses. Having said that, undesirable Unwanted side effects may also happen, such as obtaining unwanted valence states with the concerned ions or energy transfers.
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Laser crystals are optical crystals �?commonly single crystals (monocrystalline optical supplies) �?which are applied as attain media for stable-state lasers. Usually, They're doped with possibly trivalent uncommon 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。