Not known Facts About a-BBO Crystal
Not known Facts About a-BBO Crystal
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The substantial injury threshold of BBO crystals is especially essential in environments in which higher-depth lasers are the norm. Common elements might falter, degrade, as well as crack beneath these intensities.
β-BBO Crystal—a extensively applied nonlinear crystal for frequency conversion inside the ultraviolet, seen and around-infrared
Any scratches can degrade the optical general performance of your crystal and possibly result in injury underneath large laser electric power. For stubborn stains, a solution of moderate detergent or isopropyl alcohol is often gently placed on the crystal surface after which rinsed off with distilled water.
A: A substantial problems threshold makes sure the crystal can tackle additional electric power without the need of degrading, leading to for a longer time lifespan and consistent overall performance.
We use Numerical Aperture (NA) to describe the extent of the angular content. Ideally, the fundamental laser mild could well be collimated all through the crystal, since collimated mild resembles a group of rays aligned to precisely the same direction with an NA of zero.
Even so, it’s vital that you note that while BBO crystals can transmit UV mild, they must be taken care of with care when used in UV programs to prevent likely harm to the crystal and make certain security.
Stage matching drastically enhances the conversion effectiveness and will be necessary to receive enough frequency-doubled light-weight for applications, but second harmonic era (SHG) will take place whether or not section matching will not be carried out. The result of section matching to the output depth of SHG light (I2ω) is illustrated in Figure sixteen.
a-BBO crystals having a wedge angle (α) is usually custom fabricated with the desired orientation from the optical axis. A paired or these kinds of prisms With all the optical axes orthogonal to one another can be employed to continuously alter the stage change or time hold off in between two orthogonally polarized pulses.
Pumped because of the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength vary between 422nm and 477nm has become noticed by angle-tuning a kind I BBO crystal. Pumped by read more a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields a lot more than fiftyµJ (optimum a hundred thirtyµJ),
Consequently, the 2nd harmonic pulse spectrum, shown on the ideal, incorporates a spectral width roughly similar to the ideal circumstance. Ideally, each individual frequency in the basic pulse spectrum would be concurrently section matched.
This calculation assumes a uniform beam intensity profile. You should now regulate this Power density to account for hotspots or other nonuniform intensity profiles and around estimate a most Power density. For reference a Gaussian beam normally incorporates a most energy density that's two times that on the 1/e2 beam.
The angular content material on the resultant SHG pulse, or beam, within the dimension of the angular filter is lessened from a great case. Inside the perpendicular dimension, the SHG beam preserves the angular material from the input beam, because there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. within the horizontal and vertical dimensions, brings about an elliptical beam.
The temporal walk-off is usually regarded as extreme when the temporal lag exceeds the length of the fundamental pulse. Significant walk-off may end up in temporal lag that irreparably enhances the period on the output second harmonic pulse.
This is particularly essential in industries like semiconductors and micro-electromechanical systems (MEMS), wherever even a slight error can render a part ineffective or cause considerable losses. With BBO’s 266nm technology, industries can realize higher precision and reliability inside their fabrication procedures, driving innovation and item high-quality to new heights.