a-BBO Crystal - An Overview

a-BBO Crystal - An Overview

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The calculation over assumes a uniform beam intensity profile. You will need to now consider hotspots in the beam or other non-uniform intensity profiles and about calculate a utmost ability density.

Beta Barium Borate (BBO) crystals happen to be a subject of fascination in the sector of optics and photonics because of their exclusive Homes. In this article, we purpose to reply ten popular questions about BBO crystals, furnishing a comprehensive understanding of this intriguing material.

There's two velocities that define the propagation of light in optical media: the stage and group velocities. The period velocity is the pace with the copyright, the oscillation of the electric industry, as well as velocity that is certainly matched between the basic and second harmonic frequencies for stage matching. The section velocity relative to your speed of sunshine in a very vacuum is described by the index of refraction.

In quasi-section matching, the crystal content is “poled�?to have up and down domains to counteract the phase-mismatch of the fabric, where the poling time period is unique for the wavelengths of interaction.

We use Numerical Aperture (NA) to explain the extent of this angular articles. Preferably, the elemental laser gentle can be collimated throughout the crystal, since collimated light resembles a bunch of rays aligned to precisely the same direction with an NA of zero.

Now Examine the maximum electrical power density to that which happens more info to be specified as the LIDT to the optic. Should the optic was analyzed at a wavelength aside from your running wavelength, the injury threshold has to be scaled appropriately.

Physically, when the basic spectrum is nicely in the reference pulse spectrum, the SHG pulse depth profile may be the sq. of the elemental depth profile, proficiently truncating the duration. This case is illustrated in Determine 20.

As an alternative to decompose the SHG polarization into elements Ex and Ez, The sunshine is often referred to as a rare wave (E'e) having a refractive index, n'e. In the diagram on the right, n'e, which depends upon θ, is indicated from the intersection on the conic area illustrated via the red ellipse Together with the XZ airplane.

Pumped with the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength assortment involving 422nm and 477nm has long been noticed by angle-tuning a sort I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields much more than 50µJ (utmost one hundred thirtyµJ),

With appropriate treatment and handling, BBO crystals can final for a few years. On the other hand, their lifespan may be shortened by variables for instance large temperature, humidity, and Actual physical hurt. BBO crystals are robust and durable, but Like every optical element, they're able to degrade over time Otherwise effectively cared for.

This calculation assumes a uniform beam depth profile. It's essential to now regulate this Power density to account for hotspots or other nonuniform intensity profiles and approximately compute a maximum Vitality density. For reference a Gaussian beam ordinarily includes a most Electricity density that's two times that on the 1/e2 beam.

When evaluating an LIDT specified for a pulsed laser to the laser, it is critical to grasp the subsequent:

When laser light-weight is concentrated into a place, the diameter in the beam waistline may be the focal spot measurement, and the rate at which the light diverges from the beam waistline is related to the Rayleigh range (zR).

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