Laser Crystal for Dummies
Laser Crystal for Dummies
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The commonest laser-Energetic scarce earth ions and host media along with some usual emission wavelengths are revealed in the next table:
These ions allow the crystal to amplify light-weight with the laser wavelength through stimulated emission, when Power is equipped for the crystal via absorption of pump gentle (�?optical pumping
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The host medium influences strongly the wavelength, bandwidth and transition cross-sections of pump and laser transitions and likewise the upper-condition life time.
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。
A higher area quality is certainly important. Technical specs of surface flatness are sometimes much better than . This will help to avoid both scattering losses and wavefront distortions which can degrade the laser's beam quality. On top of that, scratch and dig requirements
g. a skinny disk. As another illustration, Q-switched lasers arrive at a higher inhabitants density within the upper laser stage and they are as a result additional delicate to quenching effects and energy transfer processes; for that reason, a decreased doping density is commonly suitable for these equipment. For top-energy lasers, lessen doping densities are sometimes utilized to Restrict the density of warmth technology, While thin-disk lasers work finest with very doped crystals. Lots of laser items don't get to the comprehensive efficiency possible due to the fact this kind of specifics have not been appropriately worked out.
A few laser crystal materials are actually demonstrated in which some saturable absorber content is integrated for passive Q switching of a laser.
热膨胀和收缩系数对确定激光晶体的热透镜特性至关重要。最小化热透镜效应对于在广泛的操作温度范围内保持光束质量至关重要。
All those surfaces that happen to be handed with the laser beam are Usually possibly oriented at Brewster's angle or have an anti-reflection coating.
主体材料中活性离子掺杂物的数量是关键因素。它影响了激光的效率和性能。过低的浓度可能导致低输出，过高的浓度可能导致消光效应，降低晶体的效率。
The medium should have a large transparency (lower absorption and scattering) inside the wavelength locations of pump and laser radiation, and excellent optical homogeneity. To some extent, this depends on the caliber of the fabric, based on specifics with the fabrication procedure.
With That idea, one particular will not want an additional saturable absorber crystal, so that a person may possibly make extra compact Q-switched laser setups with decreased inner parasitic losses. However, undesired Uncomfortable side effects more info can also manifest, for example getting undesirable valence states with the involved ions or Strength transfers.
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