The 2-Minute Rule for a-BBO Crystal
The 2-Minute Rule for a-BBO Crystal
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The 2 frequencies' stage velocities are equal when they have the exact same refractive index. The refractive indices for these two frequencies are normally not equal, for the reason that all media except vacuum are dispersive. Consequently a material's refractive index will depend on the light's frequency.
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As Earlier mentioned, pulsed lasers ordinarily induce a unique variety of damage towards the optic than CW lasers. Pulsed lasers frequently never heat the optic sufficient to wreck it; rather, pulsed lasers make powerful electric fields effective at inducing dielectric breakdown in the material.
BBO crystals can be cleaned employing a soft fabric or air blower. For stubborn stains, a delicate detergent or isopropyl alcohol can be employed. It’s essential to steer clear of utilizing abrasive resources that would scratch the crystal’s area. When cleansing BBO crystals, it’s essential to use a gentle, round motion to avoid scratching the surface.
Negative uniaxial α-BBO crystal is a wonderful birefringent crystal, ideal for the manufacture of polarizer, polarization beam displacer, time hold off compensator plate and other birefringent device, especially for UV and superior electricity laser.
Bodily, when the elemental spectrum is effectively throughout the reference pulse spectrum, the SHG pulse intensity profile would be the sq. of the basic depth profile, correctly truncating the length. This case is illustrated in Figure twenty.
On the other hand, whilst BBO crystals can run at room temperature, Excessive temperatures should even now be avoided as they're able to affect the crystal’s stage-matching disorders and possibly lead to hurt.
Now Examine the most Electricity density to that that is specified because the LIDT with the optic. In the event the optic was examined at a wavelength aside from your functioning wavelength, the damage threshold should be scaled appropriately [three].
Thus, the next harmonic pulse spectrum, revealed on the proper, contains a website spectral width somewhere around similar to the ideal case. Preferably, just about every frequency in the fundamental pulse spectrum would be simultaneously period matched.
Thorlabs provides a wide variety of optics optimized for use with femtosecond and picosecond laser pulses. You should see below for more information.
This fantastic-tuning ability implies that BBO crystals can cater to both equally generic and hugely specialised needs with equivalent finesse.
When an input pulse's spectral selection is equivalent to or narrower compared to reference pulse, the created next harmonic pulse includes a length which is shorter by an element of one/√2 as well as a spectral width which is broader by a factor of √2.
The spectrally narrowed SHG pulse spectrum is claimed being apodized, given that an result of the basic pulse exceeding the utmost input bandwidth limit could be the removal of the very best and least expensive frequencies from the SHG pulse spectrum.