a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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The calculation previously mentioned assumes a uniform beam depth profile. You will need to now contemplate hotspots while in the beam or other non-uniform depth profiles and around compute a utmost electric power density.
The two frequencies' stage velocities are equal every time they provide the identical refractive index. The refractive indices for these two frequencies are commonly not equal, because all media apart from vacuum are dispersive. Because of this a material's refractive index depends upon the light's frequency.
The Electricity in the two waves propagates in Instructions based on their Poynting vectors. Snell's regulation isn't going to describe the route of energy circulation, but it surely can be employed to work out the way on the k-vector during the crystal.
A: A significant problems threshold makes sure the crystal can take care of more electrical power without degrading, leading to lengthier lifespan and consistent efficiency.
From the ray-design viewpoint, the propagation direction defines the orientation in the central (chief) ray in Determine 23. The SHG system is influenced by the variety of angles over which incident light propagates, mainly because light-weight that's not parallel to your chief ray has decreased period-matching relative towards the chief ray.
). This spatial concentrating constraint about the SHG approach will normally end in the crystal duration usually being lower than the Rayleigh selection of the input centered pulse.
Their significant injury threshold and excellent thermal stability make them well suited for use in substantial-energy laser systems, when their vast transparency assortment permits them to operate by using a broad selection of laser wavelengths.
Even so, whilst BBO crystals can function at place temperature, Intense temperatures really should still be avoided as they will have an affect on the crystal’s stage-matching ailments and possibly lead to destruction.
Pumped from the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength variety amongst 422nm and 477nm has long been observed by angle-tuning a sort I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields a lot more than fiftyµJ (maximum 130µJ),
On top of that, spectroscopy, a method that’s fundamental in examining and being familiar with the properties of assorted substances, reaps the benefits of BBO’s abilities. Spectroscopy relies within the interaction in between light and make a difference to derive insights a few material’s composition, construction, and also other Homes.
This calculation assumes a uniform beam intensity profile. You should now regulate this Electricity density to account for hotspots or other nonuniform depth profiles and approximately estimate a maximum Vitality density. For reference a Gaussian beam commonly has a highest Electricity density that's 2 times that on the one/e2 beam.
The angular written content of your resultant SHG pulse, or beam, while in the dimension of the angular filter is diminished from a perfect scenario. In the perpendicular dimension, the get more info SHG beam preserves the angular articles of your input beam, given that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. from the horizontal and vertical dimensions, contributes to an elliptical beam.
The second harmonic mild is then polarized parallel for the plane. Angle tuning adjusts θ and is also performed by rotating the crystal throughout the Y-axis.
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