What Does Laser Crystal Mean?
What Does Laser Crystal Mean?
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Different crystalline resources are incredibly various concerning their hardness along with other properties, which identify with which procedures And the way easily they are often Slice and polished with top quality.
The medium ought to have a large transparency (small absorption and scattering) while in the wavelength locations of pump and laser radiation, and excellent optical homogeneity. To some extent, this depends on the caliber of the material, determined by aspects from the fabrication course of action.
The host medium influences strongly the wavelength, bandwidth and transition cross-sections of pump and laser transitions and in addition the upper-state lifetime.
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 get media and even a few-amount gain media, a single usually should limit the length to a value which is way too shorter for efficient pump absorption, as reabsorption effects would usually spoil the efficiency. For aspect pumping, more issues arrive into Perform; Apart from efficient pump absorption, it's important to obtain a suitable spatial shape with the obtain profile.
g. a skinny disk. As One more case in point, Q-switched lasers reach a higher population density inside the upper laser level and are thus far more delicate to quenching consequences and energy transfer procedures; thus, a decreased doping density is frequently appropriate for these units. For top-electrical power lasers, decrease doping densities are often utilized to limit the density of warmth generation, Despite the fact that slender-disk lasers function finest with extremely doped crystals. Quite a few laser goods will not get to the complete general performance likely since such details have not been properly worked out.
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Moreover, some adaptability is misplaced in experiments if just one cannot try out absorbers with distinct thickness or doping focus, such as, with out exchanging the laser crystal by itself.
These ions allow the crystal to amplify light-weight on the laser wavelength by using stimulated emission, when energy is equipped towards the crystal by means of absorption of pump light (�?optical pumping
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These tables include only the commonest host crystals; numerous others exist, which happen to be significantly less frequently utilised.
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Several laser crystal supplies happen to be demonstrated where some saturable absorber material is included for passive Q switching of the laser.
For various factors, composite crystals have become common. These Possess a spatially different chemical composition and may be designed with special shapes.
You can find a variety of crystalline media, that may be grouped in accordance to special atomic constituents and crystalline structures. Some critical teams of crystals are:
With get more info That idea, a single isn't going to want a further saturable absorber crystal, to ensure one particular might make more compact Q-switched laser setups with lower internal parasitic losses. However, unwelcome Uncomfortable side effects may occur, including acquiring undesired valence states with the associated ions or Electrical power transfers.
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It is obvious that different programs cause pretty various needs on laser get media. For this reason, a broad selection of various crystals are made use of, and making the correct decision is important for developing lasers with the best possible 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。