The calculation over assumes a uniform beam intensity profile. You should now consider hotspots in the beam or other non-uniform intensity profiles and about compute a optimum energy density.
This sort of resilience ensures that its nonlinear properties are not simply compromised, making it a favourite in environments exactly where consistency and reliability are paramount.
So as to use the specified CW harm threshold of an optic, it is necessary to find out the next:
Beam diameter can also be crucial to know when comparing hurt thresholds. Although the LIDT, when expressed in units of J/cm², scales independently of place size; significant beam sizes are more likely to illuminate a bigger number of defects which can cause larger variances during the LIDT [four].
Any contamination can degrade the optical performance with the crystal and probably bring about injury underneath high laser ability. When storing BBO crystals, they ought to be placed within a protecting circumstance to prevent Actual physical harm and mud accumulation.
Make sure you Take note that We have now a buffer created between the desired destruction thresholds on the internet and the tests which We have now completed, which accommodates variation amongst batches. Upon ask for, we can offer person take a look at information along with a screening certificate.
Delving deeper into your prowess of BBO crystals, it’s apparent that they characterize the forefront of recent photonics. Their broad transparency array not just bestows them with flexibility but will also guarantees that they're compatible with assorted light-weight sources.
The angular material of the concentrated beam may be visualized by tracing rays from the lens on the focal location. Each and every ray drawn with the lens click here into a tightly focused location (Figure 23) makes a special angle (ψ) Together with the Main ray, along with the array of angles increases With all the NA. Because the array of angles improves past the reference NA filter (or angular domain apodization filter width), the period-matching with the rays outside of the filter width diminishes for that reason decreasing the SHG conversion efficiency of All those rays.
Now Evaluate the most Strength density to that that is specified as being the LIDT for your optic. If the optic was analyzed at a wavelength other than your running wavelength, the damage threshold have to be scaled properly [3].
The period velocity is the speed at which the sphere copyright, i.e. the sine wave, travels in a fabric. The speed at which a pulse envelope travels in a fabric is called the group velocity and defines the speed on the Electrical power packet comprising the optical pulse touring through the material.
Both broad-bandwidth pulses and temporal stroll-off cause a reduction from the conversion efficiency, along with worsen the optical excellent of the second harmonic pulses. The suitable crystal thickness really should be picked out to minimize each results.
Beta Barium Borate (BBO) crystals have taken the globe of photonics by storm. One of the more remarkable elements of these crystals is their pioneering job in 266nm era.
Their supremacy On this area is not just by chance, but a results of their intrinsic and meticulously crafted properties.
Pulsed lasers with higher pulse repetition frequencies (PRF) might behave likewise to CW beams. Unfortunately, this is very depending on variables including absorption and thermal diffusivity, so there's no trustworthy technique for determining any time a significant PRF laser will injury an optic as a consequence of thermal outcomes.