5 Simple Statements About a-BBO Crystal Explained

5 Simple Statements About a-BBO Crystal Explained

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Normal cleaning and correct storage might help prolong the lifespan of BBO crystals. It’s also important to steer clear of exposing the crystals to ailments outside the house their specified running variety, as this may cause long lasting destruction.

The 2 frequencies' section velocities are equivalent every time they have the similar refractive index. The refractive indices for these two frequencies are typically not equivalent, for the reason that all media other than vacuum are dispersive. Consequently a material's refractive index relies on The sunshine's frequency.

A different equally intriguing application is optical parametric oscillation. Within this, BBO permits the conversion of a photon into two photons with various frequencies, the sum of which equals the initial photon’s frequency.

Nonetheless, to completely use the likely of BBO crystals, it truly is very important to be familiar with their Attributes and the way to deal with and shop them appropriately. These crystals have to have thorough managing to prevent harm to their surfaces and should be stored in the dry, interesting spot to keep up their optical overall performance.

Any contamination can degrade the optical overall performance with the crystal and perhaps cause harm underneath high laser electric power. When storing BBO crystals, they should be positioned in a protecting circumstance to prevent physical damage and mud accumulation.

Now Examine the most electric power density to that which happens to be specified because the LIDT for that optic. When the optic was examined at a wavelength in addition to your operating wavelength, the harm threshold need to be scaled correctly.

Bodily, when the basic spectrum is well inside the reference pulse spectrum, the SHG pulse depth profile may be the square of the fundamental depth profile, properly truncating the duration. This circumstance is illustrated in Figure 20.

It is usually required to concentration the incident gentle inside the crystal for SHG programs, considering that effective technology of second harmonic mild necessitates high peak intensities, like 109 W/cm2. When utilizing femtosecond pulses with average energies in the nanojoule vary, acquiring the expected peak intensities can require smaller focal places.

BBO crystals might be procured from several suppliers specializing in optical elements. It’s essential to pick a reliable supplier to be certain the caliber of the crystals.

The SHG gentle is polarized while in the XZ plane which is orthogonal to each the Eo as well as the k-vector. Instead of decompose the polarization of your SHG light into Ex and Ez factors, the electric area is often described as a rare wave (E'e). The refractive index for this extraordinary wave, n'e, alterations like a function of θ. n'e(θ) is usually calculated utilizing the equation in Figure 13. The ellipse defining the remarkable index of refraction as a function of θ is actually a conic portion from the index ellipsoid.

BBO nonlinear crystal is usually a detrimental uniaxial crystal. It offers section matching for various second-buy interactions Just about over its complete transparency variety. This transparency ranges from 185 nm to three.3 µm, as inferred from transmittance measurements making use of crystal samples of a few mm thickness.

Since the dynamics of this method are highly subject to experimental parameters, it truly is hard to arbitrarily predict the exact outcomes on the second harmonic pulse. These consequences can include things like again conversion, where 2nd harmonic gentle is transformed again to basic mild, and spectral narrowing of your SHG pulse.

When laser light-weight is concentrated to some spot, the diameter from the beam waistline may be the focal spot size, and the rate at which the light diverges from the beam midsection is associated with the Rayleigh range (zR).

In frequency conversion, BBO crystals are used to change the coloration of laser mild, enabling the manufacture of a wide array of shades that aren't instantly obtainable from accessible laser resources. check here In electro-optic modulation, They're utilized to regulate the depth, period, polarization, or course of the laser beam.