About a-BBO Crystal
About a-BBO Crystal
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The calculation over assumes a uniform beam depth profile. You have to now look at hotspots from the beam or other non-uniform depth profiles and approximately estimate a greatest power density.
The 2 frequencies' period velocities are equal if they have the exact same refractive index. The refractive indices for these two frequencies are normally not equal, for the reason that all media apart from vacuum are dispersive. Consequently a material's refractive index will depend on The sunshine's frequency.
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However, it’s essential to Be aware that even though BBO crystals can cope with significant electric power, they must nonetheless be employed in just their specified electrical power assortment to stop possible damage and make certain best performance.
Any contamination can degrade the optical performance of the crystal and possibly trigger problems underneath significant laser power. When storing BBO crystals, they ought to be placed inside a protective situation to prevent Actual physical destruction and dirt accumulation.
Adverse uniaxial α-BBO crystal is an excellent birefringent crystal, well suited for the manufacture of polarizer, polarization beam displacer, time delay compensator plate and various birefringent machine, specifically for UV and significant energy laser.
Figure eighteen: The regular and incredible refractive indices of β-BBO differ with frequency and wavelength resulting from a fabric property named dispersion. Dispersion exists get more info in all media apart from vacuum.
Rather than decompose the SHG polarization into factors Ex and Ez, The sunshine is usually called a rare wave (E'e) having a refractive index, n'e. During the diagram on the best, n'e, which is determined by θ, is indicated by the intersection with the conic segment illustrated from the crimson ellipse Along with the XZ airplane.
Comprehension Crystal is akin to appreciating the bedrock of Innovative optical know-how. At its essence, BBO, or Beta Barium Borate, stands as being a nonlinear optical crystal. The term “nonlinear�?listed here signifies the special skill from the crystal to connect with mild inside a way that alters The sunshine’s frequency.
A5: Of course, BBO crystals have excellent thermal security and might manage their Attributes at space temperature. Which means they are often Utilized in a wide array of environments without the need of requiring Particular temperature Management.
The elemental resource will be the dye laser radiation pumped by the next harmonic of a Q-switched Nd: YAG laser. A wander-off compensated configuration Using the BBO crystal pair has enabled us to comprehend this type of significant conversion performance in the interaction.
For beams with a superior PRF both equally the common and peak powers must be as compared to the equal CW energy. On top of that, for hugely transparent elements, There is certainly little to no fall while in the LIDT with growing PRF.
Nevertheless, the nonlinear optical properties of a-BBO crystal is vanished because of the centric symmetry with its crystal structure. It is not advisable to utilize for NLO processes.
In addition, the structural and compositional attributes of BBO provide it with extraordinary thermal security and resistance in opposition to environmental problems.