Everything about a-BBO Crystal
Everything about a-BBO Crystal
Blog Article
The calculation above assumes a uniform beam depth profile. You should now contemplate hotspots during the beam or other non-uniform intensity profiles and around compute a optimum electricity density.
These kinds of resilience makes certain that its nonlinear Attributes are certainly not quickly compromised, rendering it a favourite in environments wherever consistency and dependability are paramount.
Determine 22: The diagram at the highest shows two pulses with diverse center frequencies incident on a fabric. The team velocity delay amongst the pulses if they enter the material is zero.
A: A high damage threshold guarantees the crystal can cope with much more electrical power without having degrading, resulting in more time lifespan and regular general performance.
From a ray-design point of view, the propagation course defines the orientation with the central (chief) ray in Determine 23. The SHG approach is influenced with the range of angles in excess of which incident mild propagates, for the reason that gentle that's not parallel to your chief ray has lowered section-matching relative to your Main ray.
Destructive uniaxial α-BBO crystal is a superb birefringent crystal, well suited for the manufacture of polarizer, polarization beam displacer, time delay compensator plate along with other birefringent gadget, specifically for UV and substantial energy laser.
Figure eighteen: The ordinary and extraordinary refractive indices of β-BBO fluctuate with frequency and wavelength due to a cloth assets termed dispersion. Dispersion exists in all media besides vacuum.
The angular content of a centered beam is usually visualized by tracing rays from the lens on the focal location. Every ray drawn through the lens to some tightly centered location (Figure 23) can make a distinct angle (ψ) with the chief ray, as well as range of angles improves While using the NA. As the selection of angles increases beyond the reference NA filter (or angular domain apodization filter width), the stage-matching from the rays beyond the filter width diminishes thus cutting down the SHG conversion efficiency of People rays.
Because the refractive index won't fluctuate linearly with frequency in dispersive crystals like β-BBO, it is actually impossible to optimally stage match each and every frequency while in the enter pulse's spectral variety with the corresponding 2nd harmonic frequency during the created pulse.
Having said that, there is not any second purchase nonlinear effect in alpha-BBO crystal a result of the centrosymmetry in its crystal composition and therefore it's no use for next buy nonlinear optical processes. As a substitute, alpha-BBO is extensively useful for fabrication of polarizers, polarizing beam displacers, stage retarders, birefringent plates, and time hold off compensators Specially Those people for UV and substantial electricity lasers.
The team velocity plus the section velocity are certainly not equivalent, this means the sine wave of your copyright plus the envelope of the pulse transfer as here a result of optical media at distinctive speeds.
From the vast world of nonlinear optical crystals, BBO crystals jump out as pioneers, specifically in the realm of 266nm era.
A encouraged guideline for focusing femtosecond laser pulses into a nonlinear crystal is to keep up a Rayleigh assortment that may be a minimum of quite a few occasions more time as opposed to duration on the SHG crystal. This minimizes the prospect of detrimental the crystal, along with minimizes the negative consequences of spatial stage mismatch and spatial (Poynting vector) walk-off.
This is especially very important in industries like semiconductors and micro-electromechanical devices (MEMS), in which even a minimal mistake can render a element ineffective or lead to important losses. With BBO’s 266nm technology, industries can reach increased precision and dependability inside their fabrication processes, driving innovation and solution quality to new heights.