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The duration on the SHG crystal drastically affects the spectral width from the reference pulse, or alternatively the bandwidth on the SHG filter.
The Strength in equally waves propagates in directions based on their Poynting vectors. Snell's legislation would not describe the way of Strength circulation, nonetheless it can be utilized to estimate the way of your k-vector in the crystal.
Beam diameter can be crucial to know when comparing problems thresholds. Whilst the LIDT, when expressed in models of J/cm², scales independently of place dimensions; significant beam measurements are more likely to illuminate a bigger range of defects which may result in bigger variances inside the LIDT [4].
We use Numerical Aperture (NA) to explain the extent of this angular articles. Preferably, the fundamental laser mild could be collimated through the entire crystal, since collimated light-weight resembles a group of rays aligned to precisely the same route using an NA of zero.
Negative uniaxial α-BBO crystal is a superb birefringent crystal, suitable for the manufacture of polarizer, polarization beam displacer, time hold off compensator plate along with other birefringent unit, especially for UV and significant ability laser.
Though the check effects are only consultant of 1 coating operate, Thorlabs specifies injury threshold values that account for coating variances.
The injury Investigation are going to be carried out on a similar optic (purchaser's optic won't be destroyed). Testing may perhaps end in supplemental costs or direct instances. Get hold of Tech Assistance for more information.
BBO crystals should be dealt with with care to avoid scratching or detrimental their surfaces. They must be saved in the dry, great position and saved faraway from direct sunlight. Frequent cleaning which has a smooth cloth or air blower is usually recommended to maintain their optical general performance. When dealing with BBO crystals, it’s imperative that you use gloves more info to stop oils through the skin from contaminating the crystal surface.
The SHG mild is polarized while in the XZ aircraft and is also orthogonal to the two the Eo plus the k-vector. In lieu of decompose the polarization from the SHG gentle into Ex and Ez factors, the electrical area is usually called a unprecedented wave (E'e). The refractive index for this extraordinary wave, n'e, adjustments as a functionality of θ. n'e(θ) might be calculated utilizing the equation in Determine thirteen. The ellipse defining the remarkable index of refraction as being a operate of θ is a conic section in the index ellipsoid.
Thorlabs offers a big variety of optics optimized to be used with femtosecond and picosecond laser pulses. Please see underneath for more information.
For beams by using a superior PRF both the typical and peak powers must be as compared to the equal CW power. Also, for hugely clear materials, There exists small to no fall in the LIDT with rising PRF.
Having said that, the nonlinear optical Houses of the-BBO crystal is vanished mainly because of the centric symmetry with its crystal framework. It isn't advisable to make use of for NLO processes.
This is particularly essential in Organic and professional medical investigate where by particular compounds or cells are tagged with fluorescent markers. The 266nm light-weight can excite these markers, earning them jump out clearly towards a track record, therefore facilitating detailed Evaluation.