Detailed Notes on Laser Crystal
Detailed Notes on Laser Crystal
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Laser modeling and simulation can be employed to reliably decide the optimum crystal dimensions, doping density And perhaps values of more parameters.
The medium must have a large transparency (lower absorption and scattering) in the wavelength regions of pump and laser radiation, and superior optical homogeneity. To some extent, this is dependent upon the quality of the material, determined by information on the fabrication system.
The host crystal is a great deal more than simply a method to fix the laser-active ions at certain positions in Room. Quite a few properties of your host substance are crucial:
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For quasi-3-degree laser achieve media and even 3-stage obtain media, 1 normally ought to Restrict the length to a price which happens to be as well short for effective pump absorption, as reabsorption outcomes would normally spoil the overall performance. For facet pumping, supplemental issues occur into Perform; Moreover effective pump absorption, it is necessary to get an acceptable spatial form in the gain profile.
g. a skinny disk. As A further case in point, Q-switched lasers get to a higher population density within the higher laser amount and they are thus extra delicate to quenching effects and Electrical power transfer procedures; hence, a reduce doping density is usually suitable for these units. For prime-electric power lasers, lower doping densities tend to be used to Restrict the density of heat era, Whilst skinny-disk lasers perform finest with extremely doped crystals. Several laser items do not reach the whole effectiveness likely for the reason that this kind of information have not been correctly labored out.
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A significant harm threshold when it comes to pulse fluence or peak depth is usually important 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 focus of the get medium are most advantageous rely on quite a few aspects. The offered pump resource (style of laser diode or lamp) as well as the envisaged pumping arrangement are very important components, but the fabric alone also has some influence. For example, titanium–sapphire lasers have to be pumped with substantial intensities, for which the form of a transversely cooled rod, operated with rather small pump and laser beam diameter, is more correct than e.
These tables incorporate only the most typical host crystals; numerous Many others exist, which might be significantly less routinely utilised.
The most common laser-active scarce earth ions and host media together with some regular emission wavelengths are demonstrated in the subsequent desk:
Individuals surfaces that happen to be handed because of the laser beam are Commonly both oriented at Brewster's angle or have an anti-reflection coating.
Of course, it is very desirable that a more info supplied crystal excellent is created persistently, Whilst distinctive laser patterns can have a distinct sensitivity to content parameters.
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。
With That idea, just one will not want an extra saturable absorber crystal, making sure that one may well make additional compact Q-switched laser setups with reduce inside parasitic losses. However, undesirable Unwanted effects may also manifest, like acquiring unwelcome valence states from the associated ions or Electrical power transfers.
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It is clear that various purposes cause quite unique specifications on laser acquire media. This is why, a broad range of various crystals are utilized, and making the appropriate preference is essential for setting up lasers with optimum general performance.
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。