About a-BBO Crystal
About a-BBO Crystal
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The superior destruction threshold of BBO crystals is particularly important in environments the place significant-depth lasers tend to be the norm. Traditional supplies could possibly falter, degrade, or maybe split below these kinds of intensities.
Beta Barium Borate (BBO) crystals are already a topic of fascination in the field of optics and photonics because of their special Houses. On this page, we intention to answer ten typical questions about BBO crystals, offering a comprehensive idea of this interesting material.
So as to use the desired CW harm threshold of an optic, it's important to understand the following:
A: Sure, BBO crystals exhibit remarkable thermal balance, creating them appropriate for apps with different temperatures.
The Electrical power density of your respective beam must be calculated with regard to J/cm2. The graph to the ideal displays why expressing the LIDT being an Strength density provides the most beneficial metric for short pulse resources. Within this routine, the LIDT offered being an Vitality density is usually placed on any beam diameter; one particular won't need to compute an altered LIDT to adjust for changes in spot dimensions.
On the other hand, it’s important to Be aware that even though BBO crystals can transmit UV light, they should be managed with treatment when Employed in UV purposes to forestall potential damage to the crystal and ensure protection.
Whilst the above process presents a great rule of thumb for LIDT values, make sure you Speak to Tech Guidance In the event your wavelength is different from the desired LIDT wavelength. Should your energy density is below the altered LIDT with the optic, then the optic must operate for the application.
a-BBO crystals using a wedge angle (α) could be custom fabricated with the desired orientation from the optical axis. A paired or this sort of prisms with the optical axes orthogonal to one another can be employed to continually adjust the period shift or time delay amongst two orthogonally polarized pulses.
This residence sets it aside from linear optical components that don’t change the frequency of sunshine passing through them. Such a distinguishing feature types the inspiration for the myriad of apps that BBO can provide.
The SHG light-weight is polarized while in the XZ aircraft and is orthogonal to the two the Eo and the k-vector. Rather than decompose the polarization in the SHG mild into Ex and Ez parts, the electrical subject get more info is often referred to as a unprecedented wave (E'e). The refractive index for this extraordinary wave, n'e, changes as being a function of θ. n'e(θ) is usually calculated utilizing the equation in Determine 13. The ellipse defining the remarkable index of refraction to be a function of θ can be a conic part of the index ellipsoid.
BBO nonlinear crystal is often a negative uniaxial crystal. It provides section matching for various second-purchase interactions Practically over its complete transparency vary. This transparency ranges from 185 nm to three.3 µm, as inferred from transmittance measurements employing crystal samples of a few mm thickness.
This attribute interprets to lowered have to have for considerable thermal administration programs, yet again accentuating Charge price savings and system simplicity.
A suggested guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to maintain a Rayleigh selection that's not less than several situations extended when compared to the size of the SHG crystal. This minimizes the chance of damaging the crystal, together with lowers the negative consequences of spatial phase mismatch and spatial (Poynting vector) walk-off.
Technology of deep ultraviolet radiation at 210 nm by Style-I 3rd harmonic era is realized in a very set of BBO crystals with conversion effectiveness as substantial as 36%.