Details, Fiction and BBO Crystal
Details, Fiction and BBO Crystal
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This text dives deep into the benefits and one of a kind Qualities of BBO crystal and its paramount worth in productive frequency doubling and harmonics generation at 266nm.
BBO is the one NLO material which can be utilised to supply the fifth harmonic era (5HG) of Nd:YAG lasers at 213 nm. Because of a little acceptance angle and huge angular walkoff, excellent laser beam excellent (modest divergence, great mode ailment, and many others.
Regretably, it could be very difficult to match the LIDT specification of the optic to the laser. You will discover various regimes through which a pulsed laser can hurt an optic which relies to the laser's pulse duration. The highlighted columns within the desk beneath outline the applicable pulse lengths for our specified LIDT values.
) is The real key for BBO to acquire higher conversion efficiency. Limited concentration of laser beam is not really suggested.
The seed crystal is slightly BBO crystal with a definite positioning together considered one of its principal axes. The seed crystal is affixed into a turning rod that dips in to the thaw surface area.
These kinds of resilience makes certain that its nonlinear Qualities are not easily compromised, which makes it a favorite in environments where by regularity and trustworthiness are paramount.
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The team velocity plus the phase velocity aren't equal, indicating the sine wave on the copyright as well as envelope of the heart beat go as a result of optical media at various speeds.
In summation, while quite a few crystals give precise strengths from the realm of photonics, BBO crystals arise as extensive powerhouses. They encapsulate a range of functions that aren't just effective in isolation but function synergistically, creating a holistic Remedy for frequency doubling and harmonics era.
For CPM, we Lower our pieces at an angle equivalent to no or 90 degrees stressing one of several big axes. For NCPM, we reduced our things at an angle determined by Snell’s regulation:
At this sort of a selected wavelength, The sunshine possesses one of a kind Qualities that are a must have to certain advanced purposes. Enable’s delve deeper into the value of this individual light production.
The spectrally narrowed SHG pulse spectrum is claimed to become apodized, because an impact of the basic pulse exceeding the utmost input bandwidth limit is the elimination of the highest and least expensive frequencies from your SHG pulse spectrum.
The angular content of the targeted beam can be get more info visualized by tracing rays in the lens towards the focal spot. Every single ray drawn from the lens to a tightly focused spot (Figure 23) tends to make another angle (ψ) Along with the chief ray, and the selection of angles raises Together with the NA. Given that the range of angles boosts further than the reference NA filter (or angular domain apodization filter width), the period-matching in the rays beyond the filter width diminishes as a result cutting down the SHG conversion efficiency of those rays.
The size in the SHG crystal significantly affects the spectral width with the reference pulse, or alternatively the bandwidth in the SHG filter.