a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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The group velocities of the fundamental and second harmonic pulses may also be unique, even though period-matched, plus the magnitude on the group velocity mismatch depends upon the crystal Attributes plus the optical frequencies in the pulses.
The Rayleigh variety quantifies the gap, measured with the beam midsection, about which the beam diameter is approximately consistent. The shorter the Rayleigh variety, the greater the speed of divergence.
Nonetheless, it’s crucial that you note that although BBO crystals can deal with high power, they should still be made use of within their specified ability assortment to avoid possible harm and ensure exceptional general performance.
BBO crystals may be cleaned using a delicate fabric or air blower. For stubborn stains, a delicate detergent or isopropyl Liquor can be utilized. It’s crucial that you avoid utilizing abrasive materials that could scratch the crystal’s area. When cleaning BBO crystals, it’s vital that you use a gentle, round movement to avoid scratching the area.
). This spatial focusing constraint around the SHG procedure will commonly lead to the crystal duration normally currently being less than the Rayleigh range of the enter focused pulse.
Though the above procedure presents a good rule of thumb for LIDT values, be sure to contact Tech Aid In the event your wavelength differs from the desired LIDT wavelength. If the electric power density is below the altered LIDT with the optic, then the optic should really do the job in your application.
It is typically necessary to focus the incident light-weight in the crystal for SHG applications, since economical era of second harmonic gentle needs high peak intensities, including 109 W/cm2. When utilizing femtosecond pulses with moderate energies in the nanojoule range, obtaining the required peak intensities can require small focal places.
But BBO crystals stand resilient, making certain that techniques keep on to function without the need of hiccups, minimizing downtimes and ensuring cost-efficiency Eventually.
The period velocity is the rate at which the sector copyright, i.e. the sine wave, travels in a fabric. The rate at which a pulse envelope travels in a material is called the group velocity and defines the velocity from the Electrical power packet comprising the optical pulse touring here as a result of the fabric.
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For beams by using a large PRF the two the average and peak powers needs to be as compared to the equal CW electricity. In addition, for really transparent materials, There may be tiny to no fall inside the LIDT with increasing PRF.
When laser gentle is targeted to a place, the diameter in the beam waist is the focal location measurement, and the rate at which The sunshine diverges with the beam waistline is associated with the Rayleigh range (zR).
BBO’s flexibility certainly shines when a person considers the breadth of its purposes. It’s not just confined to at least one specialized niche of photonics but stretches throughout multiple domains. Just take frequency doubling, For illustration. In this method, photons While using the very same frequency Blend inside the crystal to generate new photons with double the frequency of the first.