The substantial destruction threshold of BBO crystals is especially significant in environments where higher-intensity lasers tend to be the norm. Conventional products might falter, degrade, as well as crack underneath this kind of intensities.
Beta Barium Borate (BBO) crystals are a topic of desire in the field of optics and photonics due to their exclusive Homes. On this page, we goal to reply ten prevalent questions on BBO crystals, providing a comprehensive knowledge of this fascinating product.
Although this guideline gives a basic trend, It's not necessarily a quantitative Assessment of LIDT vs wavelength. In CW purposes, For illustration, hurt scales much more strongly with absorption while in the coating and substrate, which does not necessarily scale effectively with wavelength.
As Beforehand said, pulsed lasers usually induce another variety of injury for the optic than CW lasers. Pulsed lasers often will not warmth the optic sufficient to break it; instead, pulsed lasers make potent electrical fields effective at inducing dielectric breakdown in the material.
Any contamination can degrade the optical functionality with the crystal and potentially result in hurt below substantial laser energy. When storing BBO crystals, they ought to be positioned inside of a protecting scenario to prevent physical damage and mud accumulation.
You should Take note that Now we have a buffer constructed between the specified injury thresholds on the internet and the exams which We've got performed, which accommodates variation between batches. Upon request, we can provide specific test information as well as a tests certificate.
Period matching drastically enhances the conversion performance and may be needed to obtain ample frequency-doubled light for programs, but next harmonic generation (SHG) will manifest even when section matching isn't done. The effect of period matching on the output intensity of SHG light-weight (I2ω) is illustrated in Determine 16.
The angular articles of the centered beam can be visualized by tracing rays in the lens for the focal spot. Each individual ray drawn with the lens into a tightly focused place (Determine 23) would make a special angle (ψ) With all the chief ray, and the range of angles raises Using the NA. As being the variety of angles will increase further than the reference NA filter (or angular domain apodization filter width), the period-matching with the rays outside of the filter width diminishes as a result decreasing the SHG conversion efficiency of Those people rays.
When pulse lengths are involving 1 ns and 1 µs, laser-induced hurt can occur either due to absorption or simply a dielectric breakdown (thus, a user must Check out both of those CW and pulsed LIDT). Absorption is both due to an intrinsic house from the optic or resulting from area irregularities; Therefore LIDT values are only valid for optics Conference or exceeding the surface high-quality specifications given by a company.
For that reason, the second harmonic pulse spectrum, demonstrated on the best, includes a spectral width somewhere around similar to The perfect case. Ideally, just about every frequency in the elemental pulse spectrum might be at the same time section matched.
Both of those broad-bandwidth pulses and temporal walk-off lead to a discount inside the conversion effectiveness, as well as worsen the optical good quality of the second harmonic pulses. The suitable crystal thickness must be decided on to reduce equally outcomes.
For beams that has a high PRF equally the common and peak powers need to be in comparison with the equal CW electrical power. Also, for highly clear components, You can find very little to no fall while in the LIDT with raising PRF.
Thermal fluctuations are a concern in many experimental and industrial setups. But, BBO crystals�?intrinsic thermal balance makes certain that they don’t just survive but prosper in this kind of problems.
BBO’s versatility certainly shines when one particular considers the breadth of its applications. It’s not only confined to 1 market of photonics but stretches throughout various domains. Consider frequency doubling, By way of example. In this method, photons Using the identical frequency Blend throughout the crystal to produce new photons with double the frequency of website the original.