Facts About BBO Crystal Revealed
Facts About BBO Crystal Revealed
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The two frequencies' phase velocities are equivalent every time they provide the very same refractive index. The refractive indices for these two frequencies are frequently not equivalent, for the reason that all media except vacuum are dispersive. Which means that a material's refractive index depends on The sunshine's frequency.
Their substantial harm threshold and great thermal steadiness make them appropriate for use in high-electric power laser units, although their broad transparency array enables them to operate with a broad choice of laser wavelengths.
The performance of BBO crystals might be affected by a number of elements. The caliber of the crystal itself is paramount, as defects or impurities can degrade its optical Qualities. The temperature at which the crystal operates might also impact its efficiency, as changes in temperature could cause thermal expansion or contraction, likely altering the crystal’s optical Homes.
, the angle between The sunshine's propagation way along with the crystal's optic axis is usually tuned so which the refractive index of a specific frequency (ω) in the basic input pulse particularly equals the refractive index of 2 times the input frequency (2ω). It is actually standard to improve phase matching disorders for your frequency at roughly the middle of the heart beat's bandwidth.
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A recommended guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to maintain a Rayleigh assortment that is no less than several periods longer when compared to the duration in the SHG crystal. This minimizes the prospect of damaging the crystal, and also reduces the unfavorable results of spatial period mismatch and spatial (Poynting vector) stroll-off.
Operation of nonlinear crystals at temperatures under space temperature (to accomplish phase matching) is normally problematic, as it may result in condensation of h2o around the crystal surfaces When the bordering air is not incredibly dry.
It’s crucial that you stay clear of applying abrasive products or strong solvents, as these can scratch or usually problems the crystal’s surface area. Regular cleaning might help manage the crystal’s optical overall performance and extend its lifespan.
It is usually required to focus the incident light-weight during the crystal for SHG purposes, because successful era of second harmonic mild demands superior peak intensities, for instance 109 W/cm2. When working with femtosecond pulses with reasonable energies within the nanojoule array, obtaining the required peak intensities can BBO Crystal call for tiny focal places.
We use Numerical Aperture (NA) to describe the extent of the angular content material. Preferably, the elemental laser light-weight might be collimated all over the crystal, due to the fact collimated gentle resembles a bunch of rays aligned to the identical route by having an NA of zero.
BBO nonlinear crystal is a detrimental uniaxial crystal. It provides phase matching for a variety of second-get interactions almost in excess of its whole transparency array. This transparency ranges from 185 nm to 3.3 µm, as inferred from transmittance measurements working with crystal samples of a few mm thickness.
This is the so-identified as oo-e arrangement, as The 2 photons from the fundamental are polarization-oriented along the common axis and the 2nd harmonic photon's polarization is during the extraordinary plane.
The 266nm wavelength gives particular interactions that other wavelengths can’t, rendering it indispensable for detecting and finding out specific compounds.