a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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The large problems threshold of BBO crystals is especially essential in environments in which large-intensity lasers are the norm. Conventional products may well falter, degrade, or maybe crack below these types of intensities.
Beta Barium Borate (BBO) crystals are actually a topic of interest in the sector of optics and photonics due to their unique Houses. On this page, we aim to answer ten prevalent questions about BBO crystals, delivering an extensive knowledge of this interesting content.
There's two velocities that outline the propagation of sunshine in optical media: the phase and group velocities. The stage velocity may be the velocity with the copyright, the oscillation of the electrical subject, and also the velocity that is matched among the fundamental and 2nd harmonic frequencies for section matching. The phase velocity relative towards the velocity of light in a vacuum is described with the index of refraction.
A: A high damage threshold makes certain the crystal can manage far more power without the need of degrading, leading to for a longer period lifespan and regular effectiveness.
The energy density of your beam should be calculated concerning J/cm2. The graph to the ideal demonstrates why expressing the LIDT being an energy density delivers the ideal metric for short pulse resources. In this particular regime, the LIDT specified as an Electrical power density might be placed on any beam diameter; just one will not need to compute an modified LIDT to adjust for improvements in place dimension.
As the 2nd harmonic mild propagates, its Power flows in a distinct route than that of the elemental gentle.
The next harmonic frequency wave is produced as a rare wave, and that is polarized orthogonal to the basic-frequency common wave.
Even so, even though BBO crystals can run at area temperature, Serious temperatures must even now be avoided as they might have an affect on the crystal’s section-matching circumstances and most likely induce injury.
Now Look at the most Power density to that which happens to be specified given that the LIDT to the optic. If the optic was analyzed at a wavelength besides your functioning wavelength, the destruction threshold should be scaled correctly [three].
Typical cleaning and appropriate storage will help lengthen the lifespan of BBO crystals, making certain their continued contribution to the sphere of optics and photonics.
This calculation assumes a uniform beam depth profile. You a-BBO Crystal should now adjust this Strength density to account for hotspots or other nonuniform depth profiles and approximately determine a greatest Power density. For reference a Gaussian beam ordinarily incorporates a greatest Strength density that may be twice that of the 1/e2 beam.
When comparing an LIDT specified for the pulsed laser to the laser, it is crucial to learn the next:
A suggested guideline for concentrating femtosecond laser pulses into a nonlinear crystal is to maintain a Rayleigh range that may be at the least numerous times for a longer period in comparison to the duration in the SHG crystal. This minimizes the chance of harming the crystal, and also minimizes the destructive outcomes of spatial phase mismatch and spatial (Poynting vector) stroll-off.
Generation of deep ultraviolet radiation at 210 nm by Kind-I third harmonic technology is achieved in a set of BBO crystals with conversion performance as significant as 36%.