A Secret Weapon For a-BBO Crystal
A Secret Weapon For a-BBO Crystal
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Determine fifteen demonstrates the orientation of γ in a laboratory body rotation of your crystal. In this example scenario, the nonlinear crystal is mounted within an RSP1 rotation mount in addition to an RP01 rotation stage. Adjustments in γ and θ adjust the orientation on the optic axis, . In such a case, changes in γ have already been accustomed to align Together with the horizontal airplane and on the list of principle regular axes vertically. For just a vertically polarized input beam, this orientation makes it possible for the rotation stage to be used to adjust θ.
The two frequencies' stage velocities are equal once they provide the same refractive index. The refractive indices for these two frequencies are frequently not equal, for the reason that all media besides vacuum are dispersive. Therefore a material's refractive index is dependent upon The sunshine's frequency.
In order to use the specified CW destruction threshold of the optic, it's important to grasp the subsequent:
Beam diameter can be imperative that you know when evaluating problems thresholds. When the LIDT, when expressed in models of J/cm², scales independently of spot sizing; huge beam sizes are more likely to illuminate a larger quantity of defects which may result in better variances from the LIDT [4].
Any contamination can degrade the optical efficiency from the crystal and possibly induce problems under superior laser electricity. When storing BBO crystals, they must be positioned inside a protecting case to stop Bodily damage and dust accumulation.
Once the Rayleigh vary is under the crystal thickness, the distance in excess of which the beam is optimally extreme is below the crystal thickness.
Whilst the above mentioned procedure offers a good guideline for LIDT values, please Speak to Tech Assistance In the event your wavelength differs from the desired LIDT wavelength. In case your energy density is below the adjusted LIDT on the optic, then the optic should function for your personal software.
These Houses make BBO crystals hugely appealing in various purposes, from laser frequency conversion to electro-optic modulation. Their extensive transparency assortment enables them to operate by using a broad variety of laser wavelengths, though their substantial destruction threshold guarantees they could tackle substantial-power laser beams with no degradation.
Pumped with the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength assortment concerning 422nm and 477nm has become noticed by angle-tuning a sort I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields more than 50µJ (greatest one hundred thirtyµJ),
The temporal walk-off from the slower pulse with respect on the more quickly is usually a substantial fraction of the pulse duration. That is illustrated in Determine 22.
BBO nonlinear crystal is a damaging uniaxial crystal. It offers section matching for a variety of next-get interactions almost about its full transparency range. This transparency ranges from 185 nm to three.three µm, as inferred from transmittance measurements applying crystal samples of some mm thickness.
The angular content with the resultant SHG pulse, or beam, from the dimension in the more info angular filter is reduced from an excellent situation. From the perpendicular dimension, the SHG beam preserves the angular articles in the input beam, considering the fact that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. from the horizontal and vertical Proportions, leads to an elliptical beam.
The length on the crystal is a crucial parameter to look at when optimizing the SHG approach with the parameters of specific enter pulses. Absent phase-matching and temporal walk-off results, the SHG output will increase exponentially with crystal size. The target when buying an SHG crystal is to balance the crystal length with the limitations determined by the elemental pulse. Decreasing the crystal thickness minimizes results relevant to both of those stage-matching bandwidth restrictions and temporal stroll-off, which might be right linked.
Generation of deep ultraviolet radiation at 210 nm by Sort-I third harmonic generation is attained within a pair of BBO crystals with conversion efficiency as large as 36%.