The Ultimate Guide To BBO Crystal
The Ultimate Guide To BBO Crystal
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BBO crystals are developed utilizing the flux method, a approach that will involve melting Uncooked elements at substantial temperatures. The molten content is then slowly cooled to kind a crystal. This process involves exact control of temperature and cooling level to ensure the crystal’s high quality and integrity.
Their large damage threshold and great thermal security make them well suited for use in large-ability laser systems, even though their extensive transparency variety enables them to operate with a wide choice of laser wavelengths.
Note that even though the nominal depth is beneath the nominal problems threshold, there may be issues on account of fluctuations in the beam electrical power or community depth (e.g., if a beam profile has “sizzling spots�?, or resulting from isolated defects in a very crystal, that are more sensitive when compared to the frequent crystal substance.
BBO is of unique importance inside the seen and much UV. Numerous types of section-matching applications are probable, such as the next:
On the other hand, to fully benefit from the prospective of BBO crystals, it's vital to grasp their Qualities and how to manage and shop them effectively. These crystals involve cautious dealing with to prevent harm to their surfaces and should be stored in a very dry, neat spot to take care of their optical efficiency.
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The size of your crystal is a crucial parameter to contemplate when optimizing the SHG approach with the get more info parameters of individual input pulses. Absent stage-matching and temporal walk-off effects, the SHG output boosts exponentially with crystal length. The aim when selecting an SHG crystal is always to balance the crystal size with the constraints based on the fundamental pulse. Reducing the crystal thickness decreases outcomes relevant to the two section-matching bandwidth restrictions and temporal walk-off, which are directly linked.
The spatial stroll-off angle depends upon the dimensions from the beam and also the crystal length. Whilst the angle is often considerable, it will likely be tiny, generally over the order of 10 mrad, and can be neglected.
Small acceptance angle: BBO crystals have a small acceptance angle that restrictions the input light-weight beam’s gentle beam divergence and prime mode excellent for productive regularity conversion.
Pumped by the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength variety between 422nm and 477nm continues to be observed by angle-tuning a kind I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields much more than fiftyµJ (greatest a hundred thirtyµJ),
BBO nonlinear crystal can be a detrimental uniaxial crystal. It offers phase matching for a variety of next-get interactions almost in excess of its total transparency assortment. This transparency ranges from 185 nm to 3.three µm, as inferred from transmittance measurements making use of crystal samples of a few mm thickness.
As will likely be talked about under, there is a concentrating numerical aperture (NA) limitation for the SHG stage-matching course of action precisely analogous for the spectral section matching limitation talked over within the previous area (
The length in the SHG crystal significantly has an effect on the spectral width of the reference pulse, or alternatively the bandwidth of the SHG filter.