The calculation over assumes a uniform beam depth profile. You should now look at hotspots from the beam or other non-uniform depth profiles and roughly estimate a utmost ability density.
The group velocities of the elemental and next harmonic pulses can also be various, even though phase-matched, along with the magnitude with the team velocity mismatch depends on the crystal Homes as well as the optical frequencies in the pulses.
Determine 22: The diagram at the top reveals two pulses with different Middle frequencies incident on a material. The team velocity hold off between the pulses whenever they enter the fabric is zero.
As Earlier said, pulsed lasers commonly induce a distinct style of damage to your optic than CW lasers. Pulsed lasers typically don't heat the optic adequate to damage it; alternatively, pulsed lasers generate solid electric fields effective at inducing dielectric breakdown in the material.
We use Numerical Aperture (NA) to describe the extent of the angular content. Ideally, the fundamental laser light-weight could be collimated all over the crystal, because collimated gentle resembles a bunch of rays aligned to the identical way with the NA of zero.
In the situation of Form-I period matching and β-BBO crystals, the fundamental light-weight propagates as an extraordinary wave while in the crystal, when the 2nd harmonic mild propagates as a normal wave.
Delving further to the prowess of BBO crystals, it’s apparent that they represent the forefront of recent photonics. Their wide transparency vary not simply bestows them with flexibility but additionally guarantees that they are compatible with assorted mild sources.
The problems Assessment will be carried out on an identical optic (customer's optic will not be damaged). Testing may well lead to additional costs or direct periods. Contact Tech Assist To find out more.
Now Evaluate the utmost Vitality density to that which can be specified given that the LIDT for that optic. When the optic was analyzed in a wavelength besides your functioning wavelength, the injury threshold has to be scaled appropriately [three].
The period velocity is the rate at which the sphere provider, i.e. the sine wave, travels in a cloth. The speed at which a pulse envelope travels in a material is called the team velocity and defines the pace with the energy packet comprising the optical pulse traveling by means of the check here fabric.
Thorlabs provides a wide selection of optics optimized to be used with femtosecond and picosecond laser pulses. Be sure to see underneath for more information.
Beta Barium Borate (BBO) crystals have taken the planet of photonics by storm. One of the more amazing areas of these crystals is their pioneering purpose in 266nm era.
Many unique phase-matching approaches can be utilized to equalize the refractive indices of the fundamental and second harmonic mild. A single technique, which employs linearly polarized gentle along with the distinction between the ordinary and incredible refractive indices, is Variety-I essential phase matching. This can be a common approach for damaging uniaxial crystals where no > ne.
Also, the structural and compositional characteristics of BBO provide it with outstanding thermal security and resistance versus environmental issues.