Helping The others Realize The Advantages Of BBO Crystal
Helping The others Realize The Advantages Of BBO Crystal
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Custom coatings is often placed on the crystal surfaces to enhance their efficiency at specific wavelengths or to shield the crystal from environmental variables. Even so, it’s essential to Notice that any customization need to be accomplished carefully in order to avoid degrading the crystal’s optical Houses.
Although the above mentioned procedure provides a good guideline for LIDT values, be sure to Get in touch with Tech Assist In the event your wavelength differs from the desired LIDT wavelength. When your electrical power density is a lot less than the adjusted LIDT from the optic, then the optic must get the job done for your application.
Their significant hurt threshold and superb thermal balance make them appropriate for use in significant-electrical power laser techniques, when their broad transparency array lets them to operate having a wide range of laser wavelengths.
It really is greatly employed for nonlinear frequency conversion in the ultraviolet, seen, and in close proximity to-infrared. The BBO crystal is definitely the most crucial nonlinear crystal for close to-infrared optical parametric chirped-pulse amplifiers, which presently supply handful of optical cycle pulses with higher average and ultrahigh peak powers.
, the angle amongst The sunshine's propagation way plus the crystal's optic axis is often tuned so the refractive index of a selected frequency (ω) in the fundamental input pulse particularly equals the refractive index of two times the input frequency (2ω). It really is common to optimize period matching disorders for that frequency at around the center of the pulse's bandwidth.
The calculation previously mentioned assumes a uniform beam intensity profile. You should now take into consideration hotspots in the beam or other non-uniform depth profiles and around estimate a highest power density.
A advisable guideline for concentrating femtosecond laser pulses into a nonlinear crystal is to take care of a Rayleigh range that is not less than quite a few occasions longer in comparison to the duration with the SHG crystal. This minimizes the prospect of harming the crystal, and minimizes the damaging consequences of spatial phase mismatch and spatial (Poynting vector) wander-off.
Nonlinear Crystals of either β-barium borate (BBO) or lithium triborate (LBO) are utilized for frequency conversion of laser sources. BBO crystals aspect thicknesses from 0.2mm to 0.5mm to attenuate team velocity mismatch and are ideal for frequency doubling or tripling of Ti:Sapphire and Yb:doped laser pulses. The significant and noncritical phase matching LBO crystals are ideal for second or third harmonic generation of Nd:YAG and Yb:doped lasers.
BBO crystals are delicate and have to have watchful dealing with to avoid harm to their surfaces. They ought to be dealt with with clean, lint-free gloves to stay away from scratching or contaminating their surfaces. When not in use, BBO crystals must be stored in the interesting, dry position faraway from direct sunlight, as prolonged exposure to warmth and light can degrade their optical Attributes.
It is usually essential to focus the incident BBO Crystal gentle while in the crystal for SHG programs, given that efficient technology of next harmonic mild demands high peak intensities, for instance 109 W/cm2. When working with femtosecond pulses with average energies during the nanojoule vary, acquiring the necessary peak intensities can require tiny focal places.
When evaluating an LIDT specified for the pulsed laser in your laser, it is essential to learn the subsequent:
They also have a higher injury threshold, permitting them to handle significant-electricity laser beams with out degradation. These unique Attributes make BBO crystals a flexible Device in different optical apps.
Therefore, the second harmonic pulse spectrum, demonstrated on the appropriate, provides a spectral width somewhere around the same as The best scenario. Preferably, every single frequency in the fundamental pulse spectrum might be simultaneously period matched.
Inspect the crystal floor for dust and stains by holding it around a shiny visible-gentle resource. Viewing at various angles may help see scattering from dust and stains. The crystal surface must be cleaned as explained below if dust and stains are identified.