BBO Crystal - An Overview
BBO Crystal - An Overview
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A: Of course, BBO crystals exhibit remarkable thermal balance, building them well suited for purposes with different temperatures.
The 2 frequencies' period velocities are equivalent when they possess the identical refractive index. The refractive indices for these two frequencies are commonly not equivalent, for the reason that all media apart from vacuum are dispersive. Therefore a cloth's refractive index will depend on The sunshine's frequency.
These Homes make BBO crystals very attractive in many applications, from laser frequency conversion to electro-optic modulation. Their wide transparency selection lets them to operate which has a broad selection of laser wavelengths, even though their significant destruction threshold ensures they are able to cope with substantial-ability laser beams without having degradation.
) is the key for BBO to get significant conversion effectiveness. Tight emphasis of laser beam is not advised.
, the angle between the light's propagation direction and also the crystal's optic axis may be tuned so that the refractive index of a particular frequency (ω) in the basic enter pulse just equals the refractive index of 2 times the enter frequency (twoω). It is actually usual to enhance period matching disorders with the frequency at roughly the middle of the heart beat's bandwidth.
). This spatial focusing constraint around the SHG course of action will frequently bring about the crystal duration always getting less than the Rayleigh array of the enter focused pulse.
This publish-up will explain how we create substantial-high-quality BBO crystals at our company. We will also critique some rewards and complications of utilizing BBO crystals for regularity conversion.
The group velocity as well as the section velocity are certainly not equal, meaning the sine wave with the copyright plus the envelope of the pulse transfer by way of optical media at unique speeds.
For client comfort the crystals may be mounted in an 1" anodized aluminum (Al) mount. The mounted crystals is often further mounted in a conventional 1" mirror mount to generally be angle tuned for stage matching (as revealed to the appropriate). Drinking water-cooled mounts for top electricity apps is usually made available on ask for.
One example is, anti-reflective coatings is usually applied to cut down mild reduction as a consequence of reflection, even though protecting coatings can be used to increase the crystal’s resistance to environmental variables. Customization allows for optimal functionality in unique purposes.
We use Numerical Aperture (NA) to describe the extent of the angular written content. Preferably, the basic laser mild would be collimated through the crystal, because collimated light-weight resembles a group of rays aligned to exactly the same course with an NA of zero.
The manufacture of Beta-Barium Borate (BBO) crystals is a posh and more info meticulous method that needs a substantial level of precision and abilities. This process, often known as the flux technique, commences Together with the preparing of a combination of barium borate and barium fluoride.
The wavelength of The sunshine applied and also the angle at which it enters the crystal might also impact the crystal’s effectiveness. Appropriate alignment and handling in the crystal are important to attaining optimum efficiency.
Inspect the crystal floor for dust and stains by holding it near a brilliant obvious-light-weight supply. Viewing at various angles will help see scattering from dust and stains. The crystal floor should be cleaned as explained below if dust and stains are located.