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BBO is the one NLO substance which may be employed to make the fifth harmonic era (5HG) of Nd:YAG lasers at 213 nm. As a consequence of a small acceptance angle and large angular walkoff, great laser beam quality (smaller divergence, great manner ailment, etcetera.
And finally, the vast-angle tunability of BBOs facilitates customization like hardly ever in advance of. Based on the particular specifications of the application, the crystal can be adjusted with precision, making certain which the output is often optimized.
Sure, BBO crystals is usually tailored to meet specific needs. This features tailor made measurements, designs, and coatings. Custom made measurements and designs can be Slice to suit specific optical techniques, although tailor made coatings is often applied to boost the crystal’s functionality in certain applications.
Wide openness selection: BBO crystals have a large openness array from 189 nm to 3500 nm, covering ultraviolet, visible, and in close proximity to-infrared areas. This allows BBO crystals for use for varied laser resources with various wavelengths.
Indeed, BBO crystals could be custom-made according to precise necessities. This involves custom sizes, styles, and coatings. Nonetheless, customization might have an effect on the crystal’s Attributes and effectiveness, so it ought to be accomplished by an expert. Custom made sizes and shapes may be Minimize from a bigger BBO crystal to suit precise applications.
Now Evaluate the utmost electricity density to that which is specified given that the LIDT for your optic. Should the optic was analyzed in a wavelength other than your running wavelength, the hurt threshold needs to be scaled appropriately.
This difference triggers period mismatch among various light-weight polarization areas when propagating by way of a BBO crystal. Changing the angle in between the beam and crystal axes can compensate for this stage mismatch.
BBO’s flexibility really shines when a person considers the breadth of its purposes. It’s not just confined to one market of photonics but stretches throughout multiple domains. Just take frequency doubling, For example. In this method, photons Using the similar frequency Blend throughout the crystal to supply new photons with double the frequency of the initial.
The Electrical power density of one's beam ought to be calculated in terms of J/cm2. The graph to the appropriate displays why expressing the LIDT being an energy density provides the top metric for short pulse sources. In this particular routine, the LIDT presented as an Vitality density may be placed on any beam diameter; 1 would not need to compute an modified LIDT to regulate for improvements in place measurement.
High nonlinear coefficients: BBO crystals have important nonlinear coefficients that make successful frequency conversion procedures with low input electrical power needs probable.
Many alternative Houses of the nonlinear crystal may be crucial for an software e.g. in nonlinear frequency conversion:
The angular content of a focused beam is usually visualized by tracing rays more info in the lens to your focal location. Each and every ray drawn within the lens into a tightly targeted place (Figure 23) helps make a different angle (ψ) With all the Main ray, plus the array of angles improves While using the NA. Because the selection of angles improves outside of the reference NA filter (or angular domain apodization filter width), the stage-matching of the rays outside of the filter width diminishes as a result lessening the SHG conversion performance of People rays.
The length with the SHG crystal considerably impacts the spectral width of your reference pulse, or alternatively the bandwidth on the SHG filter.