a-BBO Crystal for Dummies
a-BBO Crystal for Dummies
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The significant problems threshold of BBO crystals is especially critical in environments in which substantial-intensity lasers are the norm. Conventional resources may falter, degrade, and even crack beneath these kinds of intensities.
A1: Yes, BBO crystals Have a very substantial injury threshold, producing them ideal for large-electricity laser programs. Their capability to withstand higher laser intensities without having suffering from optical damage would make them a superb choice for frequency conversion in superior-electric power lasers.
To be able to use the specified CW injury threshold of the optic, it's important to understand the following:
In quasi-phase matching, the crystal material is “poled�?to acquire up and down domains to counteract the phase-mismatch of the material, the place the poling period of time is specific on the wavelengths of conversation.
We use Numerical Aperture (NA) to explain the extent of the angular material. Ideally, the elemental laser mild could be collimated through the crystal, due to the fact collimated mild resembles a gaggle of rays aligned to the identical direction having an NA of zero.
In the situation of Sort-I period matching and β-BBO crystals, the fundamental gentle propagates as an extraordinary wave while in the crystal, even though the next harmonic mild propagates as a standard wave.
Whilst the above mentioned course of action supplies a great general guideline for LIDT values, make sure you Make contact with Tech Assist if your wavelength differs from the required LIDT wavelength. In the event your power density is less than the altered LIDT of the optic, then the optic ought to perform on your software.
The angular written content of a centered beam may be visualized by tracing rays from your lens to the focal place. Each individual ray drawn in the lens into a tightly concentrated spot (Figure 23) would make a different angle (ψ) Together with the Main ray, and the number of angles raises With all the NA. As being the range of angles raises over and above the reference NA filter (or angular domain apodization filter width), the section-matching of the rays outside of the filter width diminishes therefore lessening the SHG conversion performance of those rays.
Now compare the most Electrical power density to that which happens to be specified as being the LIDT for that optic. In case the optic was examined at a wavelength other than your functioning wavelength, the destruction threshold have to be scaled appropriately [three].
The SHG light is polarized during the XZ aircraft and is also orthogonal to equally the Eo along with the k-vector. In lieu of decompose the polarization on the SHG light into Ex and Ez factors, the electric field is often referred to as a unprecedented wave (E'e). The refractive index for this amazing wave, n'e, adjustments as a operate of θ. n'e(θ) may be calculated utilizing the equation in Determine 13. The ellipse defining the amazing index of refraction as being a functionality of θ is actually a conic portion in the index ellipsoid.
It really is extensively utilized for nonlinear frequency conversion inside the ultraviolet, seen, and in the vicinity of-infrared. The BBO crystal will be the most important nonlinear crystal for close to-infrared optical parametric chirped-pulse amplifiers, which at this time supply few optical cycle pulses with large normal and ultrahigh peak powers.
Following, the power/Electricity is both increased or diminished as well as the optic is uncovered at ten new locations. This method is repeated until eventually problems is noticed. The harm threshold is then assigned being the highest power/Electricity the optic can face up to devoid of causing destruction. A histogram which include that down below represents the tests of one BB1-E02 mirror.
When a-BBO Crystal an input pulse's spectral selection is equal to or narrower as opposed to reference pulse, the produced 2nd harmonic pulse provides a length that is definitely shorter by an element of one/√2 plus a spectral width that is definitely broader by an element of √2.
Last of all, spectroscopy, the examine of interactions among issue and electromagnetic radiation, significantly Advantages in the 266nm generation. In spectroscopic purposes, distinctive wavelengths of light interact in another way with elements, offering a spectrum that could be analyzed to find out the material’s Attributes or composition.