What Does BBO Crystal Mean?
What Does BBO Crystal Mean?
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Occasionally, the mismatch can be compact. For instance, when a β-BBO crystal is used to frequency double 1550 nm light-weight and supply 775 nm gentle, the group velocity mismatch is only a few femtoseconds per millimeter.
The choice of your best suited crystal substance for the given software is frequently significantly from trivial; it should require the consideration of many factors. For instance, a substantial nonlinearity for frequency conversion of ultrashort pulses would not aid Should the interaction length is strongly restricted by a large team velocity mismatch along with the very low harm threshold limits the relevant optical intensities.
Thorlabs provides a wide selection of optics optimized for use with femtosecond and picosecond laser pulses. Make sure you see underneath To find out more.
It is broadly employed for nonlinear frequency conversion while in the ultraviolet, noticeable, and around-infrared. The BBO crystal is definitely the most important nonlinear crystal for near-infrared optical parametric chirped-pulse amplifiers, which at this time provide number of optical cycle pulses with substantial regular and ultrahigh peak powers.
For beams having a high PRF both equally the typical and peak powers need to be when compared with the equal CW ability. In addition, for extremely transparent products, There exists tiny to no drop during the LIDT with raising PRF.
The calculation higher than assumes a uniform beam depth profile. You must now take into account hotspots while in the beam or other non-uniform depth profiles and roughly estimate a most electrical power density.
This publish-up will describe how we crank out superior-high-quality BBO crystals at our enterprise. We may also overview some positive aspects and troubles of applying BBO crystals for regularity conversion.
When pulse lengths are amongst 1 ns and one µs, laser-induced hurt can take place possibly as a consequence of absorption or maybe a dielectric breakdown (for that reason, a person have to Verify both CW and pulsed LIDT). Absorption is either because of an intrinsic property on the optic or as a result of area irregularities; Hence LIDT values are only valid for optics Conference or exceeding the floor top quality specifications given by a maker.
BBO crystals are sensitive and involve thorough dealing with to avoid damage to their surfaces. They should be managed with clean up, lint-no cost gloves to avoid scratching or contaminating their surfaces. When not in use, BBO crystals ought to be stored in a cool, dry place clear of immediate daylight, as prolonged publicity to heat and lightweight can degrade their optical Homes.
It is usually important to concentrate the incident gentle while in the crystal for SHG apps, due to the fact efficient technology of next harmonic mild requires higher peak intensities, including 109 W/cm2. When working with femtosecond pulses with average energies during the nanojoule range, getting the necessary peak intensities can need compact focal spots.
Pumped with the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength array involving 422nm and 477nm has actually click here been observed by angle-tuning a sort I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields much more than fiftyµJ (greatest one hundred thirtyµJ),
Also, it could be extremely attractive to implement a crystal material which may be critically phase-matched at space temperature for the reason that noncritical section matching frequently requires the operation of the crystal in a very temperature-stabilized crystal oven. Having said that, the feasibility of critical stage matching may be supplied only for adequately substantial peak powers.
The angular content material of the targeted beam may be visualized by tracing rays from your lens into the focal spot. Every single ray drawn from the lens into a tightly concentrated spot (Figure 23) would make a different angle (ψ) Together with the Main ray, and the variety of angles raises with the NA. As being the selection of angles boosts beyond the reference NA filter (or angular domain apodization filter width), the period-matching of your rays outside of the filter width diminishes for that reason lessening the SHG conversion performance of those rays.
Due to its exceptional Houses BBO crystal includes a range of advantages for different apps, like NOPA with fsec pulses, harmonics generation (as many as fifth) of Nd:YAG and Nd:YLF lasers, frequency doubling or tripling of femtosecond Ti:Sapphire and dye lasers, OPO at Kind 1 and Type two period-matching, E/O switching for Pockels cells and all kinds of other.