The best Side of a-BBO Crystal
The best Side of a-BBO Crystal
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Sadly, it might be quite challenging to check the LIDT specification of an optic to the laser. You will find many regimes wherein a pulsed laser can destruction an optic and this is predicated around the laser's pulse length. The highlighted columns from the table down below outline the related pulse lengths for our specified LIDT values.
Any scratches can degrade the optical efficiency from the crystal and possibly result in damage less than large laser electricity. For stubborn stains, an answer of gentle detergent or isopropyl Alcoholic beverages could be Carefully placed on the crystal floor and then rinsed off with distilled water.
As Beforehand said, pulsed lasers generally induce a distinct type of harm to the optic than CW lasers. Pulsed lasers typically tend not to heat the optic plenty of to wreck it; alternatively, pulsed lasers produce robust electrical fields able to inducing dielectric breakdown in the fabric.
From a ray-product viewpoint, the propagation path defines the orientation of the central (Main) ray in Figure 23. The SHG process is impacted because of the selection of angles about which incident light propagates, since gentle that isn't parallel to your Main ray has reduced stage-matching relative towards the Main ray.
The performance of the SHG system decreases substantially as the basic beam diverges from its concentration, Considering that the pulse Electrical power is dispersed throughout a bigger beam cross portion.
When the take a look at benefits are only consultant of one coating run, Thorlabs specifies hurt threshold values that account for coating variances.
It is often required to focus the incident mild from the crystal for SHG apps, since economical technology of next harmonic light calls for high peak intensities, for example 109 W/cm2. When working with femtosecond pulses with reasonable energies in the nanojoule assortment, acquiring the needed peak intensities can call for modest focal spots.
BBO crystals is usually procured from a variety of suppliers specializing in optical materials. It’s crucial that you choose a trustworthy supplier to guarantee the standard of the crystals.
For that reason, the next harmonic pulse spectrum, revealed on the appropriate, incorporates a spectral width around similar to more info the ideal situation. Ideally, just about every frequency in the elemental pulse spectrum could be simultaneously period matched.
This calculation assumes a uniform beam depth profile. You need to now modify this Electrical power density to account for hotspots or other nonuniform intensity profiles and about compute a optimum Vitality density. For reference a Gaussian beam commonly features a optimum Electricity density which is twice that in the one/e2 beam.
For beams by using a substantial PRF both of those the average and peak powers must be in comparison with the equivalent CW power. Moreover, for very clear materials, There exists minor to no drop during the LIDT with raising PRF.
When laser gentle is concentrated to your location, the diameter on the beam waist could be the focal spot dimensions, and the speed at which The sunshine diverges from the beam waist is relevant to the Rayleigh vary (zR).
This is particularly vital in biological and clinical study the place distinct compounds or cells are tagged with fluorescent markers. The 266nm light-weight can excite these markers, earning them jump out Evidently against a track record, thereby facilitating in depth Assessment.