Not known Facts About a-BBO Crystal
Not known Facts About a-BBO Crystal
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The crystal axis is c. The Main ray is parallel to your way used to measure the tuning angle (θ), and that is optimized during phase matching. Conversion performance is optimized for rays parallel on the Main ray and worse for rays at more substantial angles (ψ) to the chief ray.
The 266nm wavelength features particular interactions that other wavelengths can’t, which makes it indispensable for detecting and studying sure compounds.
The Rayleigh range quantifies the gap, calculated from the beam waist, over which the beam diameter is around frequent. The shorter the Rayleigh selection, the larger sized the speed of divergence.
The section matching angle is often altered by rotating the crystal around the y axis. An adjustment that is usually in just a number of degrees can possibly improve the effectiveness of your crystal inside the setup or match One more elementary frequency from the crystal's functioning array.
We use Numerical Aperture (NA) to explain the extent of the angular material. Preferably, the basic laser light would be collimated through the crystal, because collimated light-weight resembles a gaggle of rays aligned to a similar direction using an NA of zero.
When the Rayleigh variety is lower than the crystal thickness, the gap around which the beam is optimally rigorous is under the crystal thickness.
While the above treatment presents a great general guideline for LIDT values, you should Make contact with Tech Guidance When your wavelength is different from the desired LIDT wavelength. In the event your power density is fewer than the adjusted LIDT in the optic, then the optic should really perform to your application.
Some makers' SHG crystals, like Thorlabs', give near-period-matched situations for Generally incident enter gentle for any specified elementary frequency. These manufacturers polish the faces in the SHG crystals this sort of that the angle between the normally incident mild and also the optic axis may be the stage-matched angle here for the specified frequency.
BBO crystals should be dealt with with treatment to prevent scratching or harming their surfaces. They must be stored inside of a dry, neat position and kept away from immediate sunlight. Common cleaning with a delicate cloth or air blower is suggested to keep up their optical performance. When managing BBO crystals, it’s vital that you use gloves to prevent oils within the pores and skin from contaminating the crystal surface area.
The group velocity would be the velocity of the heartbeat, or more formally the envelope of the electric subject. The team index in the same way governs the speed of your envelope relative towards the velocity of light in the vacuum and is dependent on the dispersion of the fabric.
This calculation assumes a uniform beam intensity profile. You have to now modify this energy density to account for hotspots or other nonuniform intensity profiles and about determine a highest Strength density. For reference a Gaussian beam usually features a highest Power density which is twice that of the one/e2 beam.
This characteristic translates to reduced require for in depth thermal management devices, once again accentuating Charge discounts and system simplicity.
When an input pulse's spectral assortment is equal to or narrower compared to the reference pulse, the generated next harmonic pulse includes a length which is shorter by an element of 1/√2 and a spectral width that is definitely broader by a factor of √2.
Technology of deep ultraviolet radiation at 210 nm by Kind-I 3rd harmonic era is obtained in a pair of BBO crystals with conversion performance as high as 36%.