The best Side of BBO Crystal
The best Side of BBO Crystal
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After the crystals have fashioned, They are really then carefully extracted from your cooled combination. This extraction procedure involves a substantial amount of treatment in order to avoid harming the newly shaped crystals.
On the other hand, it’s essential to Observe that while BBO crystals can transmit UV gentle, they must be taken care of with treatment when Utilized in UV purposes to avoid probable damage to the crystal and assure protection.
When the Rayleigh assortment is fewer than the crystal thickness, the gap above which the beam is optimally rigorous is less than the crystal thickness.
Now Look at the maximum Electricity density to that which is specified as the LIDT for that optic. In the event the optic was tested at a wavelength aside from your running wavelength, the problems threshold need to be scaled appropriately [3].
BBO features a minimal susceptibility to humidity. The AR coating or maybe the protective coating (P-coating) around the crystal faces can protect the faces from dampness to some extent. It is fine to leave the crystal within the setup for many optics labs with RH =< forty%. Even so, we advise to store the crystal inside of a desiccator if it will not be utilised for more than > two months to lengthen the crystal lifetime.
Period matching appreciably improves the conversion efficiency and may be required to receive adequate frequency-doubled gentle for apps, but next harmonic generation (SHG) will arise even though period matching isn't carried out. The impact of period matching about the output depth of SHG gentle (I2ω) is illustrated in Figure 16.
When laser mild is concentrated to your place, the diameter of your beam waist will be the focal place size, and the speed at which the light diverges with the beam waistline is relevant to the Rayleigh array (zR).
Along with their use in laser frequency conversion, BBO crystals have discovered purposes in electro-optic modulation and quantum optics experiments.
We also layer our goods with anti-reflection levels to lower illustration losses within the crystal surfaces.
Any scratches can degrade the optical performance from the crystal and probably bring about hurt underneath large laser electric power. For stubborn stains, an answer of delicate detergent or isopropyl alcohol may be Carefully placed on the crystal surface area and after that rinsed off with distilled drinking water.
Large nonlinear coefficients: BBO crystals have major nonlinear coefficients that make successful frequency conversion procedures with lower input ability requires possible.
In frequency conversion, BBO crystals are accustomed to alter the coloration of laser light-weight, enabling the creation of a wide range of shades that are not straight available from available laser sources. In electro-optic modulation, These are made use of to manage the depth, section, polarization, or route of a laser beam.
The 266nm generation refers to the manufacture of ultraviolet gentle by using website a wavelength of 266 nanometers.
Even though the crystal product or coating is not delicate to drinking water, small h2o droplets might focus laser radiation more tightly than underneath typical operation, and so problems the crystal materials.