The 2-Minute Rule for a-BBO Crystal
The 2-Minute Rule for a-BBO Crystal
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The calculation previously mentioned assumes a uniform beam depth profile. It's essential to now take into account hotspots during the beam or other non-uniform depth profiles and around determine a utmost electrical power density.
The size with the SHG crystal substantially has an effect on the spectral width from the reference pulse, or alternatively the bandwidth of your SHG filter.
To be able to use the desired CW destruction threshold of an optic, it is necessary to find out the next:
On the other hand, it’s crucial to Notice that although BBO crystals can manage significant energy, they should nonetheless be made use of in their specified energy variety to circumvent possible destruction and make sure optimum efficiency.
We use Numerical Aperture (NA) to explain the extent of this angular content material. Preferably, the elemental laser light-weight could well be collimated through the entire crystal, since collimated gentle resembles a bunch of rays aligned to the same course by having an NA of zero.
Now Evaluate the utmost electric power density to that which happens to be specified as the LIDT with the optic. Should the optic was analyzed at a wavelength other than your functioning wavelength, the damage threshold must be scaled correctly.
Bodily, when the fundamental spectrum is properly throughout the reference pulse spectrum, the SHG pulse intensity profile will be the square of the fundamental depth profile, efficiently truncating the duration. This situation is illustrated in Figure twenty.
These Attributes check here make BBO crystals extremely appealing in various applications, from laser frequency conversion to electro-optic modulation. Their huge transparency selection lets them to work with a wide array of laser wavelengths, even though their high damage threshold makes sure they are able to take care of substantial-electric power laser beams without degradation.
BBO crystals can be acquired from several suppliers specializing in optical components. It’s important to go with a reputable supplier to ensure the quality of the crystals.
The group velocity could be the velocity of the heart beat, or maybe more formally the envelope of the electric discipline. The team index likewise governs the velocity of your envelope relative for the velocity of sunshine in the vacuum and is also depending on the dispersion of the material.
The Uncooked elements, typically a mix of barium carbonate and boric acid, are positioned inside a platinum crucible and heated until eventually they soften. The temperature is then steadily decreased, enabling the BBO crystal to type in excess of many weeks. The crystal is then extracted, cut into the desired form, and polished to attain a high-good quality optical surface.
The angular material with the resultant SHG pulse, or beam, within the dimension with the angular filter is lessened from a great situation. While in the perpendicular dimension, the SHG beam preserves the angular content from the enter beam, given that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. during the horizontal and vertical Proportions, brings about an elliptical beam.
Several diverse phase-matching strategies may be used to equalize the refractive indices of the fundamental and next harmonic gentle. One particular method, which uses linearly polarized light-weight as well as difference between the everyday and incredible refractive indices, is Sort-I crucial phase matching. This is the typical tactic for adverse uniaxial crystals through which no > ne.
BBO’s flexibility genuinely shines when one particular considers the breadth of its applications. It’s not only confined to 1 area of interest of photonics but stretches throughout various domains. Choose frequency doubling, By way of example. In this method, photons Along with the identical frequency combine inside the crystal to supply new photons with double the frequency of the initial.