The Definitive Guide to BBO Crystal
The Definitive Guide to BBO Crystal
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This text dives deep into the benefits and one of a kind Attributes of BBO crystal and its paramount significance in productive frequency doubling and harmonics generation at 266nm.
In lots of scenarios, a nonlinear crystal utilized for nonlinear frequency conversion has an incredibly lengthy lifetime, and that is longer than that of The complete laser program. The crystal material is basically not modified during Procedure. However, a decreased crystal life span can come about beneath many circumstances:
Lastly, the vast-angle tunability of BBOs facilitates customization like never ever prior to. Based on the certain specifications of an application, the crystal can be adjusted with precision, making sure which the output is often optimized.
Indeed, BBO crystals might be custom made to satisfy distinct prerequisites. This incorporates custom sizes, shapes, and coatings. Custom made dimensions and designs is usually Reduce to suit precise optical techniques, though personalized coatings could be placed on greatly enhance the crystal’s effectiveness in particular apps.
The second harmonic light is then polarized parallel into the aircraft. Angle tuning adjusts θ and is also performed by rotating the crystal within the Y-axis.
Regular cleansing and right storage may help increase the lifespan of BBO crystals. It’s also crucial that you stay clear of exposing the crystals to situations outside the house their specified running assortment, as this may cause long term damage.
When laser light is targeted to a place, the diameter on the beam waist would be the focal location sizing, and the speed at which The sunshine diverges from your beam waist is connected with the Rayleigh range (zR).
Nonlinear Crystals of possibly β-barium borate (BBO) or lithium triborate (LBO) are employed for frequency conversion of laser sources. BBO crystals characteristic thicknesses from 0.2mm to 0.5mm to minimize group velocity mismatch and are perfect for frequency doubling or tripling of Ti:Sapphire and Yb:doped laser pulses. The critical and noncritical phase matching LBO crystals are ideal for next or 3rd harmonic technology of Nd:YAG and Yb:doped lasers.
Beam diameter is additionally crucial to know when comparing damage thresholds. When the LIDT, when expressed in units of J/cm², scales independently of spot dimension; huge beam sizes usually tend to illuminate more info a bigger range of defects which may lead to greater variances in the LIDT [4].
BBO crystals is often obtained from several different suppliers all over the world. When selecting a supplier, it’s imperative that you think about variables which include the quality of the crystals, the provider’s name, and the extent of customer service provided.
Regardless of whether it’s in the event of extra productive lasers, the exploration of quantum phenomena, or the development of new optical gadgets, BBO crystals will without doubt carry on to Participate in a pivotal part.
The crystal axis is c. The Main ray is parallel to your route accustomed to measure the tuning angle (θ), which is optimized during period matching. Conversion efficiency is optimized for rays parallel into the Main ray and worse for rays at larger sized angles (ψ) on the chief ray.
The angular written content of the targeted beam could be visualized by tracing rays with the lens to the focal place. Each and every ray drawn in the lens to some tightly concentrated spot (Determine 23) helps make another angle (ψ) Along with the chief ray, as well as array of angles improves with the NA. Because the array of angles boosts outside of the reference NA filter (or angular area apodization filter width), the period-matching of your rays beyond the filter width diminishes therefore reducing the SHG conversion efficiency of These rays.
Large angular stroll-off BBO crystals have a big angular stroll-off that triggers spatial splitting in between many polarization areas of sunshine when circulating by using a BBO crystal.