Nonlinear Crystal for Dummies
Nonlinear Crystal for Dummies
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Laser modeling and simulation can be used to reliably establish the ideal crystal dimensions, doping density and possibly values of extra parameters.
人造红宝石激光晶体是首次实现激光输出的材料。可用焰熔法、提拉法或助熔剂法生产单晶。用提拉法容易获得大尺寸优质晶体。
The host medium influences strongly the wavelength, bandwidth and changeover cross-sections of pump and laser transitions and also the upper-state life time.
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For quasi-three-amount laser attain media or perhaps a few-stage obtain media, 1 often ought to limit the duration to a price that is much too limited for successful pump absorption, as reabsorption results would normally spoil the effectiveness. For facet pumping, supplemental issues arrive into play; Moreover effective pump absorption, it is important to get an acceptable spatial shape on the gain profile.
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A large injury threshold with regard to pulse fluence or peak intensity is often crucial for top-Strength 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 in the achieve medium are most beneficial rely on many factors. The offered pump supply (type of laser diode or lamp) as well as envisaged pumping arrangement are important aspects, but the fabric itself also has some impact. One example is, titanium–sapphire lasers need to be pumped with higher intensities, for which the shape of the transversely cooled rod, operated with somewhat compact more info pump and laser beam diameter, is more ideal than e.
It could be oriented for around perpendicular incidence in the laser beam, or at Brewster's angle. It can be set in certain strong mount which also functions for a heat sink. Larger sized crystals are often utilized for side pumping e.g. with superior-energy diode bars.
The most common laser-Energetic rare earth ions and host media together with some regular emission wavelengths are shown in the following desk:
Several laser crystal products are already shown in which some saturable absorber product is incorporated for passive Q switching of the laser.
For a variety of explanations, composite crystals have gotten well-liked. These Use a spatially varying chemical composition and might be created with Specific styles.
There exists a wide range of crystalline media, which can be grouped according to important atomic constituents and crystalline constructions. Some vital groups of crystals are:
With That idea, just one won't require yet another saturable absorber crystal, to ensure that one particular may well make a lot more compact Q-switched laser setups with reduced inner parasitic losses. Nevertheless, unwelcome side effects can also happen, which include acquiring unwelcome valence states in the included ions or Vitality transfers.
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It is clear that diverse programs result in very distinctive necessities on laser achieve media. Because of this, a wide variety of various crystals are utilised, and producing the proper option is important for constructing 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。