Top Guidelines Of BBO Crystal
Top Guidelines Of BBO Crystal
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When choosing an SHG crystal, the pulse length with the laser source needs to be taken into consideration. A mismatch in between the period and crystal thickness will bring on SHG pulses more time in time and narrower in spectral written content than probable beneath best ailments.
When the Rayleigh range is under the crystal thickness, the distance about which the beam is optimally rigorous is a lot less than the crystal thickness.
One of several defining characteristics of BBO crystals is their superior harm threshold. Because of this they can endure high amounts of laser energy without encountering degradation or injury.
The angular content material of your resultant SHG pulse, or beam, inside the dimension with the angular filter is lowered from a perfect case. During the perpendicular dimension, the SHG beam preserves the angular articles from the input beam, given that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. within the horizontal and vertical dimensions, causes an elliptical beam.
The calculation above assumes a uniform beam depth profile. You have to now take into account hotspots while in the beam or other non-uniform intensity profiles and about work out a maximum energy density.
Their supremacy Within this domain is not simply by accident, but a result of their intrinsic and meticulously crafted Attributes.
This distinction triggers stage mismatch concerning numerous gentle polarization components when propagating via a BBO crystal. Adjusting the angle among the beam and crystal axes can compensate for this period mismatch.
We also layer our objects with anti-reflection levels to minimize illustration losses on the crystal surfaces.
Small acceptance angle: BBO crystals have a small acceptance angle that limitations the enter mild beam’s gentle beam divergence and leading method top quality for efficient regularity conversion.
The performance of the SHG method decreases substantially as the basic beam diverges from its concentrate, For the reason that pulse Electrical power is dispersed across a larger beam cross segment.
Nevertheless, in many scenarios, the real difference in the elemental and 2nd harmonic pulse velocities could cause a person pulse to appreciably lag the opposite.
The temporal wander-off is frequently viewed as intense when the temporal lag exceeds the period of the basic pulse. Intense wander-off can result in temporal lag that irreparably raises the period on the output next harmonic pulse.
The duration from the SHG click here crystal noticeably impacts the spectral width with the reference pulse, or alternatively the bandwidth of the SHG filter.