What Does BBO Crystal Mean?
What Does BBO Crystal Mean?
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Both broad-bandwidth pulses and temporal walk-off result in a reduction from the conversion performance, together with worsen the optical quality of the second harmonic pulses. The appropriate crystal thickness really should be picked to attenuate both of those consequences.
BBO is the only NLO content which can be utilised to create the fifth harmonic era (5HG) of Nd:YAG lasers at 213 nm. Because of a small acceptance angle and huge angular walkoff, superior laser beam top quality (tiny divergence, great manner issue, and many others.
These properties make BBO crystals hugely appealing in a variety of purposes, from laser frequency conversion to electro-optic modulation. Their extensive transparency selection makes it possible for them to work using a wide array of laser wavelengths, though their superior problems threshold assures they will cope with higher-electric power laser beams without degradation.
Determine 23: This diagram illustrates a beam's focal location inside a uniaxial birefringent material. Straight traces, symbolizing rays, are drawn in the Heart in the beam midsection. Since the beam diverges within the beam midsection, the energy during the beam is dispersed above a larger cross sectional region.
, the angle concerning The sunshine's propagation way and also the crystal's optic axis is often tuned so that the refractive index of a certain frequency (ω) in the elemental input pulse precisely equals the refractive index of two times the enter frequency (twoω). It truly is normal to improve stage matching conditions for the frequency at about the middle of the heartbeat's bandwidth.
The calculation above assumes a uniform beam depth profile. You will need to now consider hotspots inside the beam or other non-uniform intensity profiles and roughly work out a greatest electrical power density.
This produce-up will explain how we create high-quality BBO crystals at our check here corporation. We will even evaluate some strengths and problems of using BBO crystals for regularity conversion.
In summary, BBO crystals are an interesting and functional content which has appreciably State-of-the-art the sector of optics and photonics. By understanding their properties and how to handle them, we can carry on to harness their likely and travel further more enhancements in optical know-how.
A5: Sure, BBO crystals have great thermal stability and may retain their Houses at area temperature. Because of this they may be used in a variety of environments with no necessitating Exclusive temperature Command.
It’s like using only one Notice and splitting it into two harmonious tones. This method can be vital in various Innovative optical experiments and technologies.
Higher nonlinear coefficients: BBO crystals have considerable nonlinear coefficients which make efficient frequency conversion processes with reduced input electric power needs attainable.
The manufacture of Beta-Barium Borate (BBO) crystals is a posh and meticulous system that needs a large degree of precision and knowledge. This method, often known as the flux approach, begins Along with the planning of a mix of barium borate and barium fluoride.
The temporal walk-off is frequently deemed serious if the temporal lag exceeds the period of the elemental pulse. Serious stroll-off can result in temporal lag that irreparably improves the duration in the output next harmonic pulse.
Inspect the crystal area for dust and stains by holding it in close proximity to a vivid obvious-light resource. Viewing at distinctive angles will help see scattering from dust and stains. The crystal floor has to be cleaned as described down below if dust and stains are discovered.