The 5-Second Trick For BBO Crystal
The 5-Second Trick For BBO Crystal
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Unfortunately, it can be quite challenging to compare the LIDT specification of an optic to your laser. You will find numerous regimes wherein a pulsed laser can hurt an optic which is predicated around the laser's pulse size. The highlighted columns while in the table below define the related pulse lengths for our specified LIDT values.
Moreover, spectroscopy, a way that’s basic in examining and knowledge the Homes of assorted substances, reaps the benefits of BBO’s abilities. Spectroscopy relies around the interaction among gentle and matter to derive insights a couple of substance’s composition, composition, as well as other properties.
For beams with a large PRF the two the common and peak powers should be when compared with the equal CW ability. On top of that, for extremely clear products, there is very little to no drop within the LIDT with growing PRF.
The calculation over assumes a uniform beam depth profile. You have to now contemplate hotspots from the beam or other non-uniform intensity profiles and around determine a highest electricity density.
When an optic is destroyed by a constant wave (CW) laser, it is often as a result of melting from the surface as a result of absorbing the laser's Electrical power or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than one µs may be handled as CW lasers for LIDT discussions.
g. 20 μm. The group velocity mismatch inside the thicker substrate substance may not make any difference, given that the nonlinear interaction usually takes area only in the thin crystal. The substrate only serves to mechanically stabilize the thin nonlinear crystal.
The spatial stroll-off angle relies on the size on the beam and the crystal size. When the angle may be sizeable, it is usually smaller, generally to the order of ten mrad, and might be neglected.
The period matching angle is often modified by rotating the crystal within the y axis. An adjustment that is usually inside a couple levels can either optimize the overall performance of the crystal while in the set up or match An additional basic frequency from the crystal's running vary.
Dust and stains on crystal surfaces could potentially cause scattering/loss of light and may even respond with mild to damage optical surfaces in a high incident laser electricity.
The placement of the eco-friendly curve is dependent upon θ. In such a case, the angle θ has been tuned to deliver a refractive index for 515 nm light-weight that matches the refractive index for 1030 nm light-weight. This tuning angle is hence optimized for Form-I SHG period matching and also a get more info elementary-frequency input beam of 1030 nm.
As a result, the second harmonic pulse spectrum, shown on the right, features a spectral width roughly similar to The best circumstance. Ideally, each individual frequency in the basic pulse spectrum could well be simultaneously stage matched.
Some manufacturers' SHG crystals, together with Thorlabs', deliver close to-period-matched conditions for Ordinarily incident input light-weight for just a specified essential frequency. These companies polish the faces on the SHG crystals these types of that the angle between the Ordinarily incident light and the optic axis will be the period-matched angle for the specified frequency.