BBO Crystal - An Overview
BBO Crystal - An Overview
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A: Indeed, BBO crystals exhibit amazing thermal balance, earning them ideal for purposes with different temperatures.
When picking an SHG crystal, the heart beat period of the laser supply needs to be taken into account. A mismatch between the length and crystal thickness will lead to SHG pulses for a longer time in time and narrower in spectral content material than achievable less than perfect situations.
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The SHG mild is polarized from the XZ airplane and is also orthogonal to both equally the Eo and also the k-vector. As an alternative to decompose the polarization from the SHG light-weight into Ex and Ez elements, the electric area is typically referred to as a rare wave (E'e). The refractive index for this amazing wave, n'e, alterations for a functionality of θ. n'e(θ) is usually calculated utilizing the equation in Determine thirteen. The ellipse defining the amazing index of refraction as a operate of θ is actually a conic section with the index ellipsoid.
The seed crystal is a little BBO crystal with a definite positioning together one of its principal axes. The seed crystal is affixed into a turning rod that dips in the thaw area location.
The group velocity would be the pace of the heart beat, or maybe more formally the envelope of the electrical discipline. The group index equally governs the speed on the envelope relative into the speed of sunshine inside a vacuum and it is dependent on the dispersion of the fabric.
There are two velocities that determine the propagation of sunshine in optical media: the section and team velocities. The section velocity is definitely the velocity on the copyright, the oscillation of the electric discipline, along with the velocity which is matched concerning the elemental and 2nd harmonic frequencies for period matching. The phase velocity relative to the velocity of light within a vacuum is defined through the index of refraction.
g. 20 μm. The group velocity mismatch inside the thicker substrate product may well not make any difference, because the nonlinear interaction normally takes position only in The skinny crystal. The substrate only serves to mechanically stabilize The skinny nonlinear crystal.
Just about every facet of BBO, from its atomic framework to its wide application spectrum, underscores its pivotal role in modern-day science and technological know-how.
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This residence sets it aside from linear optical materials that don’t alter the frequency of light passing via them. This type of distinguishing attribute types the muse for the myriad of applications that BBO can provide.
Having said that, in many situations, the primary difference here in the elemental and second harmonic pulse velocities can result in just one pulse to noticeably lag the other.
Any contamination can degrade the optical functionality from the crystal and most likely bring about harm below substantial laser ability. When storing BBO crystals, they should be placed within a protecting scenario to circumvent physical harm and dust accumulation.
The length of your SHG crystal drastically has an effect on the spectral width on the reference pulse, or alternatively the bandwidth of the SHG filter.