The crystal axis is c. The Main ray is parallel to your course accustomed to measure the tuning angle (θ), and that is optimized in the course of stage matching. Conversion effectiveness is optimized for rays parallel on the Main ray and worse for rays at much larger angles (ψ) towards the Main ray.
The size from the SHG crystal considerably impacts the spectral width of your reference pulse, or alternatively the bandwidth on the SHG filter.
Any scratches can degrade the optical performance from the crystal and probably result in hurt beneath higher laser ability. For stubborn stains, an answer of moderate detergent or isopropyl alcohol can be gently applied to the crystal surface area and then rinsed off with distilled drinking water.
This effectiveness is significant, particularly when 1 considers the technology in the 266nm wavelength, the place even small inefficiencies may lead to major Electricity losses.
We use Numerical Aperture (NA) to explain the extent of this angular content material. Preferably, the elemental laser light will be collimated all through the crystal, given that collimated light-weight resembles a bunch of rays aligned to a similar direction with the NA of zero.
In the situation of Type-I period matching and β-BBO crystals, the elemental light propagates as a rare wave while in the crystal, even though the next harmonic mild propagates as a normal wave.
Physically, read more when the fundamental spectrum is very well inside the reference pulse spectrum, the SHG pulse intensity profile could be the square of the elemental depth profile, efficiently truncating the duration. This scenario is illustrated in Figure 20.
Some suppliers' SHG crystals, which includes Thorlabs', give in close proximity to-period-matched ailments for Ordinarily incident enter light for your specified essential frequency. These producers polish the faces from the SHG crystals these kinds of that the angle in between the Usually incident mild along with the optic axis is definitely the period-matched angle for the desired frequency.
This residence sets it in addition to linear optical products that don’t alter the frequency of sunshine passing as a result of them. This kind of distinguishing aspect varieties the foundation for just a myriad of apps that BBO can serve.
Additionally, spectroscopy, a method that’s elementary in examining and being familiar with the Qualities of varied substances, reaps the rewards of BBO’s capabilities. Spectroscopy relies around the interaction in between light-weight and make any difference to derive insights a few material’s composition, construction, along with other properties.
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Beta Barium Borate (BBO) crystals have taken the entire world of photonics by storm. Among the most amazing facets of these crystals is their pioneering role in 266nm technology.
When laser light is concentrated to the location, the diameter with the beam waistline would be the focal place dimension, and the rate at which The sunshine diverges within the beam midsection is linked to the Rayleigh variety (zR).
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