An Unbiased View of a-BBO Crystal
An Unbiased View of a-BBO Crystal
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The crystal axis is c. The Main ray is parallel for the direction accustomed to evaluate the tuning angle (θ), which can be optimized for the duration of section matching. Conversion efficiency is optimized for rays parallel for the Main ray and worse for rays at larger sized angles (ψ) on the Main ray.
Such resilience makes certain that its nonlinear Houses will not be quickly compromised, which makes it a favourite in environments in which regularity and trustworthiness are paramount.
Any scratches can degrade the optical performance with the crystal and most likely cause hurt beneath superior laser ability. For stubborn stains, an answer of gentle detergent or isopropyl Alcoholic beverages is usually gently applied to the crystal floor after which you can rinsed off with distilled drinking water.
Beam diameter can also be crucial to know when evaluating destruction thresholds. Though the LIDT, when expressed in models of J/cm², scales independently of location dimensions; huge beam dimensions are more likely to illuminate a bigger number of defects which may result in bigger variances inside the LIDT [four].
The Power density of your respective beam need to be calculated with regards to J/cm2. The graph to the right displays why expressing the LIDT being an Electrical power density delivers the most effective metric for brief pulse resources. During this regime, the LIDT specified being an energy density can be placed on any beam diameter; one won't should compute an altered LIDT to adjust for changes in spot measurement.
Nonetheless, it’s important to Be aware that while BBO crystals can transmit UV light-weight, they ought to be handled with treatment when Utilized in UV apps to avoid potential damage to the crystal and be certain safety.
When the above mentioned procedure provides a superb rule of thumb for LIDT values, please Get in touch with Tech Assist When your wavelength differs from the desired LIDT wavelength. If the electricity density is a lot less than the altered LIDT from the optic, then the optic need to operate in your software.
It is often required to aim the incident light-weight in the crystal for SHG purposes, considering that successful era of 2nd harmonic gentle necessitates high peak intensities, such as 109 W/cm2. When utilizing femtosecond pulses with average energies during more info the nanojoule vary, acquiring the required peak intensities can need small focal places.
This assets sets it in addition to linear optical materials that don’t change the frequency of sunshine passing through them. Such a distinguishing characteristic sorts the muse for your plethora of programs that BBO can serve.
Fluorescence excitation is yet another realm in which the 266nm generation showcases its importance. Fluorescence consists of the absorption of light by a fabric and the following emission of light at another wavelength. The 266nm light-weight is extremely successful in thrilling certain fluorescent products, generating them glow brightly and letting for their detection and analyze.
The basic supply is the dye laser radiation pumped by the next harmonic of a Q-switched Nd: YAG laser. A walk-off compensated configuration Using the BBO crystal pair has enabled us to comprehend this kind of substantial conversion effectiveness during the conversation.
When selecting an SHG crystal, the heartbeat period of the laser source have to be taken into account. A mismatch among the duration and crystal thickness will result in SHG pulses extended in time and narrower in spectral content than achievable underneath ideal circumstances.
Thermal fluctuations are a concern in many experimental and industrial setups. Nonetheless, BBO crystals�?intrinsic thermal steadiness makes sure that they don’t just endure but prosper in these kinds of situations.
Technology of deep ultraviolet radiation at 210 nm by Sort-I 3rd harmonic generation is obtained in a set of BBO crystals with conversion performance as substantial as 36%.