How a-BBO Crystal can Save You Time, Stress, and Money.
How a-BBO Crystal can Save You Time, Stress, and Money.
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The substantial problems threshold of BBO crystals is especially crucial in environments where by substantial-depth lasers are the norm. Classic materials may falter, degrade, or maybe crack underneath these intensities.
Regrettably, it might be very difficult to compare the LIDT specification of an optic to the laser. There are actually multiple regimes in which a pulsed laser can injury an optic which is predicated on the laser's pulse length. The highlighted columns inside the desk underneath define the related pulse lengths for our specified LIDT values.
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Beam diameter is likewise vital that you know when evaluating problems thresholds. Although the LIDT, when expressed in units of J/cm², scales independently of location measurement; huge beam measurements are more likely to illuminate a bigger amount of defects which can cause bigger variances from the LIDT [4].
The energy density of your respective beam should be calculated regarding J/cm2. The graph to the appropriate displays why expressing the LIDT being an Electrical power density gives the most effective metric for brief pulse resources. In this particular routine, the LIDT given as an Power density is usually placed on any beam diameter; one particular isn't going to have to compute an altered LIDT to adjust for modifications in location dimensions.
As the 2nd harmonic light-weight propagates, its Vitality flows in a different course than that of the basic gentle.
Although the examination effects are only consultant of one coating run, Thorlabs specifies harm threshold values that account for coating variances.
These properties make BBO crystals really appealing in numerous purposes, from laser frequency conversion to electro-optic modulation. Their huge transparency range lets them to operate which has a broad range of laser wavelengths, when their higher problems threshold guarantees they can cope with large-power laser beams with out degradation.
Now Evaluate the maximum Power density to that which is specified given that the LIDT with the optic. If your optic was examined at a wavelength other than your running wavelength, the injury threshold should be scaled correctly [three].
A5: Of course, BBO crystals have superb thermal security and can keep their properties at area temperature. This means that they are often Employed in a wide range of environments with no demanding special temperature control.
BBO nonlinear crystal is a damaging uniaxial crystal. It offers section matching for various second-purchase interactions Pretty much over its complete transparency selection. This transparency ranges from 185 nm to three.three µm, as inferred from transmittance measurements applying crystal samples of some mm thickness.
The angular material of the resultant SHG pulse, or beam, from the dimension in the angular filter is reduced from an excellent situation. During the perpendicular dimension, the SHG beam preserves the angular articles of the enter beam, because there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. from the horizontal and vertical dimensions, brings about an elliptical beam.
A advisable guideline for focusing femtosecond laser pulses into a nonlinear crystal is to take check here care of a Rayleigh vary that is definitely no less than numerous periods extended when compared to the size of the SHG crystal. This minimizes the prospect of detrimental the crystal, along with reduces the destructive outcomes of spatial phase mismatch and spatial (Poynting vector) wander-off.
Furthermore, the structural and compositional characteristics of BBO supply it with impressive thermal balance and resistance from environmental challenges.