a-BBO Crystal Options
a-BBO Crystal Options
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The group velocities of the fundamental and 2nd harmonic pulses will also be unique, even though section-matched, as well as the magnitude in the team velocity mismatch is dependent upon the crystal properties plus the optical frequencies while in the pulses.
The Strength in the two waves propagates in directions determined by their Poynting vectors. Snell's legislation doesn't describe the route of Strength movement, but it really may be used to calculate the direction from the k-vector from the crystal.
This enhancement in clarity may lead to early prognosis and timely intervention, perhaps saving lives and bettering patient results.
The Vitality density of one's beam must be calculated with regards to J/cm2. The graph to the proper shows why expressing the LIDT being an Electricity density presents the most effective metric for brief pulse resources. In this particular regime, the LIDT given as an energy density might be applied to any beam diameter; a person would not need to compute an adjusted LIDT to regulate for changes in spot dimension.
Having said that, it’s crucial to Observe that even though BBO crystals can transmit UV gentle, they need to be managed with care when used in UV applications to avoid opportunity damage to the crystal here and guarantee protection.
While the above mentioned procedure offers an excellent rule of thumb for LIDT values, please contact Tech Assist If the wavelength is different from the specified LIDT wavelength. In case your power density is less than the altered LIDT with the optic, then the optic really should operate for the application.
It is usually essential to focus the incident light-weight from the crystal for SHG programs, given that efficient technology of second harmonic light demands large peak intensities, for example 109 W/cm2. When working with femtosecond pulses with reasonable energies within the nanojoule range, getting the demanded peak intensities can demand little focal places.
When pulse lengths are between one ns and 1 µs, laser-induced destruction can arise both on account of absorption or a dielectric breakdown (therefore, a consumer have to Verify both equally CW and pulsed LIDT). Absorption is both because of an intrinsic house of your optic or due to area irregularities; thus LIDT values are only legitimate for optics Assembly or exceeding the floor high-quality requirements offered by a producer.
Hi, I used to be wondering if It truly is feasible in your case to supply a BBO crystal by using a customized coating at 532nm fundamental and 266nm second harmonic technology. Ideal, Ben
Thorlabs offers a big variety of optics optimized to be used with femtosecond and picosecond laser pulses. Make sure you see down below For more info.
This high-quality-tuning capacity implies that BBO crystals can cater to equally generic and really specialized wants with equal finesse.
Their supremacy in this domain is not simply accidentally, but a results of their intrinsic and meticulously crafted Qualities.
The spectrally narrowed SHG pulse spectrum is alleged being apodized, considering the fact that an impact of the basic pulse exceeding the most enter bandwidth limit may be the elimination of the best and lowest frequencies in the SHG pulse spectrum.