a-BBO Crystal Options
a-BBO Crystal Options
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The significant harm threshold of BBO crystals is especially significant in environments wherever substantial-intensity lasers are the norm. Classic materials could possibly falter, degrade, as well as break less than these intensities.
The 266nm wavelength offers unique interactions that other wavelengths can’t, which makes it indispensable for detecting and studying specified compounds.
Any scratches can degrade the optical overall performance in the crystal and probably result in injury below substantial laser electric power. For stubborn stains, a solution of mild detergent or isopropyl Alcoholic beverages is usually gently applied to the crystal surface area after which rinsed off with distilled h2o.
Rather than the reference pulse electrical power spectrum comprising an apodization filter, during the spatial domain the filter could well be in NA. The angular domain apodization filter even so, is only in a single-dimension defined with the airplane k and .
Various variables can have an impact on the general performance of BBO crystals. These include temperature, humidity, and the standard of the incident gentle. Suitable dealing with and storage can help manage the crystal’s functionality. Temperature can influence the phase-matching conditions of BBO crystals, which consequently influences their efficiency in frequency conversion apps.
Nonetheless, it’s imperative that you Be aware that although BBO crystals can transmit UV gentle, they ought to be handled with treatment when used in UV applications to avoid likely damage to the crystal and assure security.
While the above method supplies a fantastic general guideline for LIDT values, remember to contact Tech Assistance if your wavelength is different from the desired LIDT wavelength. In case your electrical power density is under the altered LIDT on the optic, then the optic should really get the job done to your application.
The Actual physical, chemical, optical, and thermal Houses in the α -BBO are much like those of your BBO crystals, though the α -BBO would not show the nonlinear optical Attributes because of the central symmetry of its crystal composition.
When pulse lengths are concerning one ns and one µs, laser-induced problems can manifest possibly thanks to absorption or simply a dielectric breakdown (hence, a person website will have to Test both of those CW and pulsed LIDT). Absorption is possibly as a consequence of an intrinsic assets with the optic or as a result of surface irregularities; thus LIDT values are only legitimate for optics Assembly or exceeding the surface area high quality specifications specified by a maker.
It’s like using an individual Observe and splitting it into two harmonious tones. This method is usually crucial in a lot of Highly developed optical experiments and systems.
As will likely be discussed below, You will find a focusing numerical aperture (NA) limitation into the SHG stage-matching process particularly analogous for the spectral section matching limitation talked about in the preceding section (
When choosing an SHG crystal, the pulse duration on the laser resource needs to be taken into consideration. A mismatch in between the length and crystal thickness will cause SHG pulses for a longer period in time and narrower in spectral content than feasible below best problems.
Even so, the nonlinear optical Homes of a-BBO crystal is vanished a result of the centric symmetry with its crystal framework. It's not necessarily encouraged to employ for NLO procedures.
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