The Nonlinear Crystal Diaries
The Nonlinear Crystal Diaries
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Distinct crystalline materials are really various relating to their hardness and also other Attributes, which decide with which solutions And the way simply they can be Minimize and polished with top quality.
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 a great deal more than simply a method to fix the laser-active ions at particular positions in Room. A variety of Qualities in the host content 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-amount laser get media as well as three-amount get media, one particular usually must Restrict the size to a value which is far too limited for effective pump absorption, as reabsorption consequences would or else spoil the performance. For aspect pumping, extra considerations appear into play; Moreover effective pump absorption, it is important to get a suitable spatial form of the achieve profile.
g. a thin disk. As One more case in point, Q-switched lasers achieve the next population density while in the higher laser level and therefore are hence much more sensitive to quenching outcomes and energy transfer processes; for that reason, a lower doping density is often appropriate for these products. For top-power lasers, reduce doping densities in many cases are utilized to Restrict the density of warmth technology, Whilst thin-disk lasers function very best with hugely doped crystals. Lots of laser goods do not get to the complete effectiveness possible mainly because these types of particulars have not been appropriately worked out.
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On top of that, some flexibility is lost in experiments if one cannot try out absorbers with various thickness or doping concentration, such as, with no exchanging the laser crystal itself.
These ions permit the crystal to amplify light-weight within the laser wavelength by way of stimulated emission, when Strength is supplied on the crystal via absorption of pump light-weight (�?optical pumping
Which geometry, dopant and doping focus in the obtain medium are most advantageous depend on many aspects. The out there pump supply (variety of laser diode or lamp) as well as the envisaged pumping arrangement are crucial elements, but the material itself also has some affect. One example is, titanium–sapphire lasers must be pumped with large intensities, for which the shape of a transversely cooled rod, operated with fairly smaller pump and laser beam diameter, is a lot more acceptable than e.
These tables contain only the commonest host crystals; lots of Other folks exist, which can be much less commonly used.
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People surfaces which are passed with the laser beam are Ordinarily either oriented at Brewster's angle or have an anti-reflection coating.
For various factors, composite crystals have gotten well-liked. These have a spatially different chemical composition and might be produced with special shapes.
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, one particular check here doesn't require an extra saturable absorber crystal, so that just one may possibly make far more compact Q-switched laser setups with reduced inside parasitic losses. On the other hand, undesirable Unintended effects can also come about, such as obtaining undesirable valence states in the involved ions or Strength transfers.
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Laser crystals are optical crystals �?commonly one crystals (monocrystalline optical resources) �?which are applied as obtain media for strong-point out lasers. Normally, they are doped with both trivalent scarce earth ions or transition steel 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。