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β-BBO Crystal—a greatly employed nonlinear crystal for frequency conversion within the ultraviolet, visible and close to-infrared
Any scratches can degrade the optical efficiency with the crystal and perhaps result in injury below significant laser ability. For stubborn stains, an answer of gentle detergent or isopropyl Liquor is often Carefully placed on the crystal floor after which you can rinsed off with distilled water.
This performance is vital, especially when just one considers the era of your 266nm wavelength, the place even slight inefficiencies can lead to considerable Electricity losses.
We use Numerical Aperture (NA) to explain the extent of the angular material. Preferably, the basic laser mild can be collimated all through the crystal, due to the fact collimated light-weight resembles a group of rays aligned to precisely the same course by having an NA of zero.
Make sure you Observe that We have now a buffer built between the required damage thresholds online and the checks which We have now finished, which accommodates variation amongst batches. On ask for, we can offer unique test facts along with a testing certification.
Figure eighteen: The common and amazing refractive indices of β-BBO change with frequency and wavelength resulting from a material property called dispersion. Dispersion exists in all media besides vacuum.
As illustrated in the subsequent desk, the shorter the crystal, the wider the reference pulse spectrum. The table below assumes a basic center wavelength during the in close proximity to-IR.
But BBO crystals stand resilient, guaranteeing that methods continue on to work without the need of hiccups, reducing downtimes and ensuring Price tag-efficiency In the long term.
The temporal walk-off with the slower pulse with regard to your faster might be a considerable portion of the pulse duration. This really is illustrated read more in Figure 22.
As will be talked over under, You will find a focusing numerical aperture (NA) limitation into the SHG period-matching procedure accurately analogous for the spectral section matching limitation talked about within the past segment (
This can be the so-referred to as oo-e arrangement, as the two photons from the basic are polarization-oriented along the ordinary axis and the next harmonic photon's polarization is during the incredible airplane.
Several unique stage-matching approaches may be used to equalize the refractive indices of the elemental and 2nd harmonic light. A single method, which works by using linearly polarized gentle and also the distinction between the regular and incredible refractive indices, is Variety-I critical period matching. This is a prevalent method for adverse uniaxial crystals by which no > ne.
BBO’s flexibility actually shines when just one considers the breadth of its apps. It’s not only confined to one specialized niche of photonics but stretches across numerous domains. Get frequency doubling, By way of example. In this method, photons While using the very same frequency Merge throughout the crystal to make new photons with double the frequency of the first.