Top a-BBO Crystal Secrets
Top a-BBO Crystal Secrets
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The calculation previously mentioned assumes a uniform beam intensity profile. It's essential to now take into account hotspots in the beam or other non-uniform intensity profiles and approximately work out a utmost electric power density.
β-BBO Crystal—a widely used nonlinear crystal for frequency conversion during the ultraviolet, visible and around-infrared
The place with the eco-friendly curve will depend on θ. In this case, the angle θ has long been tuned to provide a refractive index for 515 nm light that matches the refractive index for 1030 nm gentle. This tuning angle is hence optimized for Type-I SHG stage matching as well as a basic-frequency input beam of 1030 nm.
This effectiveness is important, specially when one considers the generation with the 266nm wavelength, exactly where even insignificant inefficiencies may result in significant Vitality losses.
The Vitality density of your beam should be calculated when it comes to J/cm2. The graph to the proper displays why expressing the LIDT being an energy density presents the ideal metric for short pulse resources. In this particular routine, the LIDT supplied as an energy density is often applied to any beam diameter; one would not have to compute an altered LIDT to adjust for modifications in place dimension.
In the case of Form-I stage matching and β-BBO crystals, the fundamental gentle propagates as an extraordinary wave within the crystal, though the next harmonic light propagates as a standard wave.
When the exam success are only agent of 1 coating operate, Thorlabs specifies problems threshold values that account for coating variances.
It is usually required to concentration the incident light within the crystal for SHG purposes, considering the fact that successful era of next harmonic light-weight involves substantial peak intensities, for example 109 W/cm2. When employing femtosecond pulses with moderate energies during the nanojoule range, getting the essential peak intensities can demand small focal places.
Pumped via the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength assortment involving 422nm and 477nm continues to be observed by angle-tuning a kind I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields much more than 50µJ (optimum one hundred thirtyµJ),
The section velocity is the rate at which the sphere copyright, i.e. the sine wave, travels in a cloth. The rate at which a pulse envelope travels in a cloth is called the group velocity and defines the velocity with the Strength packet comprising the optical pulse touring through the fabric.
Just about every facet of BBO, from its atomic construction to its wide application spectrum, underscores its pivotal part in contemporary science and technology.
For beams by using a superior PRF both of those the typical and peak powers needs to be when compared to the equal CW electrical power. Additionally, for highly transparent supplies, You can find very little to no drop while in the LIDT with increasing PRF.
When laser light is targeted to some website location, the diameter in the beam midsection could be the focal spot dimensions, and the rate at which The sunshine diverges in the beam midsection is linked to the Rayleigh vary (zR).
The issue that arises when employing ultrashort pulses for second harmonic technology (SHG) is usually that shorter pulses have more substantial bandwidths, but the ideal stage-matched affliction can be reached For less than only one fundamental wavelength at a time. On account of this, the standard of the period match might be considerably worse in the direction of the spectral edges of broad-bandwidth pulses.