The best Side of a-BBO Crystal
The best Side of a-BBO Crystal
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The calculation above assumes a uniform beam depth profile. You have to now think about hotspots in the beam or other non-uniform depth profiles and around estimate a greatest energy density.
A1: Yes, BBO crystals Have a very superior problems threshold, creating them appropriate for higher-energy laser devices. Their ability to face up to large laser intensities with out suffering from optical hurt would make them an excellent option for frequency conversion in significant-ability lasers.
A second concern is that the team velocity mismatch among the next harmonic and basic-frequency pulses will cause a person pulse lagging the other as The 2 propagate. This is named temporal walk-off and can occur even beneath optimum phase-matched problems.
This performance is significant, specially when one particular considers the technology of the 266nm wavelength, in which even slight inefficiencies may result in substantial Vitality losses.
From the ray-design viewpoint, the propagation course defines the orientation from the central (chief) ray in Determine 23. The SHG approach is afflicted because of the variety of angles about which incident gentle propagates, mainly because light that's not parallel to the Main ray has decreased section-matching relative on the chief ray.
Thorlabs expresses LIDT for CW lasers like a linear electricity density calculated in W/cm. In this particular regime, the LIDT presented as being a linear energy density can be placed on any beam diameter; a single doesn't ought to compute an modified LIDT to regulate for alterations in location dimension, as demonstrated because of the graph to the ideal. Common linear electrical power density can be calculated utilizing the equation underneath.
Bodily, when the fundamental spectrum is very well in the reference pulse spectrum, the SHG pulse intensity profile is the sq. of the fundamental depth profile, successfully truncating the period. This situation is illustrated in Figure 20.
Having said that, even though BBO crystals can work at room temperature, Excessive temperatures should nevertheless be averted as they will impact the crystal’s period-matching circumstances and potentially bring about damage.
One example is, contemplate a essential pulse propagating in excess of a specified crystal thickness. Once the temporal wander-off is greater when compared to the period of the basic pulse, this pulse will even have a spectral bandwidth that enormously exceeds the spectral width of the reference pulse. A common rule for limiting the detrimental outcomes connected to both of those Actual physical effects is to decide on a crystal thickness that limitations the basic and 2nd harmonic temporal stroll-off to not more than the duration of the basic pulse.
Furthermore, spectroscopy, a method that’s fundamental in examining and being familiar with the Qualities of varied substances, reaps the rewards of BBO’s capabilities. Spectroscopy relies to the conversation between mild and matter to derive insights a few substance’s composition, construction, and various Attributes.
Each individual facet of BBO, from its atomic composition to its wide application spectrum, underscores its pivotal part in modern-day science and technological know-how.
This characteristic translates to lowered want for in depth thermal management systems, again accentuating cost savings and procedure simplicity.
Many various section-matching ways can be employed to equalize the refractive indices of the basic and second harmonic light-weight. Just one approach, which utilizes linearly polarized light-weight along with the difference between the standard and remarkable refractive indices, is Type-I important phase matching. It is a frequent solution for damaging uniaxial crystals wherein no > ne.
This short article dives deep into the advantages and one of a kind click here Qualities of BBO crystal and its paramount relevance in economical frequency doubling and harmonics generation at 266nm.