Everything about a-BBO Crystal
Everything about a-BBO Crystal
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The 2 frequencies' phase velocities are equivalent once they provide the similar refractive index. The refractive indices for these two frequencies are typically not equal, for the reason that all media except vacuum are dispersive. Therefore a material's refractive index will depend on The sunshine's frequency.
To be able to use the desired CW damage threshold of the optic, it's important to know the following:
This enhancement in clarity can cause early prognosis and timely intervention, perhaps conserving lives and enhancing affected individual results.
Lastly, the extensive-angle tunability of BBOs facilitates customization like never ever before. With regards to the certain requirements of the software, the crystal might be modified with precision, guaranteeing that the output is usually optimized.
If the Rayleigh array is lower than the crystal thickness, the space more than which the beam is optimally extreme is lower than the crystal thickness.
In some cases, the mismatch is usually smaller. By way of example, whenever a β-BBO crystal is accustomed to frequency double 1550 nm light-weight and provide 775 nm gentle, the group velocity mismatch is just a few femtoseconds per millimeter.
a-BBO crystals using a wedge angle (α) might be tailor made fabricated with the desired orientation in the optical axis. A paired or this kind of prisms With all the optical axes orthogonal to each other can be employed to consistently regulate the phase shift or time delay between two orthogonally polarized pulses.
Taken jointly, these varied purposes underscore the immense worth BBO crystals carry to many sectors. As a result of its unparalleled 266nm generation, the BBO crystal is not just a Device but a catalyst, propelling enhancements throughout distinctive fields.
The temporal walk-off in the slower pulse with respect on the speedier is usually a considerable portion of the pulse period. This is certainly illustrated in Determine 22.
This calculation assumes a uniform beam intensity profile. It's essential to now modify this Electricity density to account for hotspots or other nonuniform depth profiles and approximately estimate a optimum Electricity density. For reference a Gaussian beam commonly has a maximum Vitality density that is certainly 2 times that from the 1/e2 beam.
Custom made coatings might be placed on the crystal surfaces to boost their efficiency at distinct wavelengths or to shield the crystal from environmental factors. Nevertheless, it’s vital that you Observe that any customization really should be finished carefully to avoid degrading the crystal’s optical properties.
When laser light-weight is targeted into a place, the diameter from the beam waist is the focal location dimensions, and the rate at which the light diverges from the beam midsection is relevant to the Rayleigh selection (zR).
The spectrally narrowed SHG get more info pulse spectrum is claimed to generally be apodized, given that an influence of the elemental pulse exceeding the most input bandwidth limit could be the removal of the very best and least expensive frequencies in the SHG pulse spectrum.