Everything about Nonlinear Crystal
Everything about Nonlinear Crystal
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Laser modeling and simulation can be used to reliably establish the optimum crystal Proportions, doping density and possibly values of supplemental 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 crystal is far more than just a way to fix the laser-Energetic ions at sure positions in space. Numerous Homes on the host product are very 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。
For quasi-three-degree laser attain media or perhaps a few-stage get media, a person typically really should Restrict the length to a worth that is also brief for economical pump absorption, as reabsorption effects would otherwise spoil the functionality. For facet pumping, additional considerations arrive into Engage in; Apart from effective pump absorption, it is vital to obtain an appropriate spatial form of your attain profile.
g. a thin disk. As An additional illustration, Q-switched lasers arrive at an increased population density while in the higher laser amount and so are consequently a lot more sensitive to quenching consequences and Power transfer procedures; for that reason, a decreased doping density is usually suitable for these gadgets. For top-electric power lasers, reduce doping densities are frequently accustomed to limit the density of warmth generation, Whilst skinny-disk lasers get the job done very best with very doped crystals. Lots of laser items never reach the whole effectiveness probable due to the fact these facts have not been correctly worked out.
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A superior problems threshold concerning pulse fluence or peak depth could be significant for prime-Power amplifiers.
These ions permit the crystal to amplify mild check here within the laser wavelength by way of stimulated emission, when energy is provided to the crystal by way of absorption of pump gentle (�?optical pumping
Which geometry, dopant and doping concentration with the obtain medium are most beneficial depend on a number of variables. The available pump resource (type of laser diode or lamp) as well as the envisaged pumping arrangement are very important variables, but the fabric alone also has some influence. For example, titanium–sapphire lasers ought to be pumped with higher intensities, for which the shape of a transversely cooled rod, operated with reasonably small pump and laser beam diameter, is much more proper than e.
These tables incorporate only the commonest host crystals; lots of Many others exist, which happen to be much less routinely applied.
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Some laser crystal products have already been demonstrated where by some saturable absorber product is integrated for passive Q switching of the laser.
For several good reasons, composite crystals are getting to be preferred. These Have got a spatially different chemical composition and might be created with Particular shapes.
There exists a wide range of crystalline media, that may be grouped in accordance to important atomic constituents and crystalline constructions. Some important groups of crystals are:
With that concept, just one does not will need yet another saturable absorber crystal, to ensure that a person might make a lot more compact Q-switched laser setups with decrease inside parasitic losses. Having said that, unwelcome Unwanted effects might also arise, for example acquiring unwanted valence states from the concerned ions or Power transfers.
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It is obvious that distinct applications lead to very distinctive prerequisites on laser get media. This is why, a broad range of various crystals are utilized, and making the appropriate decision is essential for setting up lasers with the best possible 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。