Nonlinear Crystal Secrets
Nonlinear Crystal Secrets
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Laser modeling and simulation can be employed to reliably decide the ideal crystal Proportions, doping density and possibly values of supplemental parameters.
The medium must have a superior transparency (minimal absorption and scattering) within the wavelength areas of pump and laser radiation, and very good optical homogeneity. To some extent, this is determined by the caliber of the material, based on facts in the fabrication process.
The host medium influences strongly the wavelength, bandwidth and transition cross-sections of pump and laser transitions and likewise 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。
The most possible doping focus can rely strongly over the host product and its fabrication method.
g. a thin disk. As another case in point, Q-switched lasers access an increased populace density while in the higher laser degree and therefore are consequently far more delicate to quenching consequences and Electricity transfer processes; for that reason, a decreased doping density is commonly appropriate for these units. For top-electrical power lasers, lessen doping densities in many cases are accustomed to Restrict the density of heat era, Despite the fact that thin-disk lasers function most effective with hugely doped crystals. Quite a few laser items don't get to the entire overall performance possible for the reason that these details have not been adequately worked out.
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A superior destruction threshold in terms of pulse fluence or peak depth can be vital for prime-Electrical 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 with the attain medium are most beneficial depend on quite a few factors. The available pump resource (kind of laser diode or lamp) along with the envisaged pumping arrangement are essential aspects, but the fabric itself also has some influence. For example, titanium–sapphire lasers must be pumped with high intensities, for which the shape of a transversely cooled rod, operated with comparatively tiny pump and laser beam diameter, is more proper than e.
It could be oriented for around perpendicular incidence of your laser beam, or at Brewster's angle. It may be fixed in certain good mount which also acts being a heat sink. Greater crystals usually are utilized for aspect pumping e.g. with significant-electric power diode bars.
The commonest laser-Energetic exceptional earth ions and host media along with some standard emission wavelengths are demonstrated in the subsequent table:
All those surfaces that are handed via the laser beam are Typically both oriented at Brewster's angle or have an anti-reflection coating.
Of course, it's very fascinating that a presented crystal top quality is created consistently, Though various laser designs may have a distinct sensitivity to materials 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, a person would not need a further saturable absorber crystal, to make sure that a person may well make additional compact Q-switched click here laser setups with decrease inner parasitic losses. However, unwanted Unwanted effects may additionally take place, including obtaining unwanted valence states of the associated ions or Electricity transfers.
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It is apparent that unique purposes bring on extremely diverse prerequisites on laser gain media. For that reason, a wide array of various crystals are used, and making the best alternative is important for constructing lasers with optimum efficiency.
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。