The 2-Minute Rule for a-BBO Crystal
The 2-Minute Rule for a-BBO Crystal
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The elemental area now driving the kind-I SHG approach may be the Eoγ component on the incident subject. At γ = 90°, there could be zero SHG output, Because the generate discipline Eoγ = 0.
Regretably, it might be very hard to match the LIDT specification of the optic for your laser. You can find a number of regimes through which a pulsed laser can hurt an optic and this relies within the laser's pulse duration. The highlighted columns while in the table beneath outline the relevant pulse lengths for our specified LIDT values.
Figure 22: The diagram at the top demonstrates two pulses with diverse Middle frequencies incident on a cloth. The group velocity hold off involving the pulses whenever they enter the material is zero.
This efficiency is significant, specially when a person considers the technology in the 266nm wavelength, in which even small inefficiencies can result in considerable Electrical power losses.
Other stage matching circumstances are also doable. Essential Style-II stage matching uses an oe-o or eo-e for favourable and detrimental uniaxial crystals. Non-important phase matching employs crystal temperature to realize section matching as an alternative to angular tuning.
The effectiveness in the SHG process decreases significantly as the basic beam diverges from its emphasis, Considering that the pulse Vitality is dispersed across a larger beam cross segment.
Humidity could cause drinking water absorption about the crystal area, which may degrade its optical general performance. The caliber of the incident mild, like its wavelength, intensity, and polarization, might also have an affect on the overall performance of BBO crystals in different apps.
The angular content material of the focused beam is often visualized by tracing rays from your lens into the focal place. Just about every ray drawn from the lens to some tightly focused spot (Figure 23) will make a different angle (ψ) Along with the chief ray, plus the number of angles improves While using the NA. Because the selection of angles increases beyond the reference NA filter (or angular domain read more apodization filter width), the stage-matching on the rays outside of the filter width diminishes consequently reducing the SHG conversion performance of All those rays.
Pumped with the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength variety amongst 422nm and 477nm has long been noticed by angle-tuning a type I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields over fiftyµJ (utmost a hundred thirtyµJ),
The temporal stroll-off on the slower pulse with regard towards the more quickly might be a considerable portion of the heart beat period. This is often illustrated in Determine 22.
As might be talked about beneath, You will find there's focusing numerical aperture (NA) limitation into the SHG stage-matching system just analogous to the spectral period matching limitation discussed from the previous part (
When comparing an LIDT specified to get a pulsed laser for your laser, it is crucial to learn the following:
The next harmonic light is then polarized parallel to the airplane. Angle tuning adjusts θ which is carried out by rotating the crystal across the Y-axis.
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