The Definitive Guide to a-BBO Crystal
The Definitive Guide to a-BBO Crystal
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The calculation higher than assumes a uniform beam depth profile. You must now consider hotspots while in the beam or other non-uniform depth profiles and around calculate a optimum energy density.
Sadly, it may be very difficult to check the LIDT specification of an optic towards your laser. You will find a number of regimes by which a pulsed laser can damage an optic and this relies about the laser's pulse duration. The highlighted columns within the table underneath define the relevant pulse lengths for our specified LIDT values.
The Power in each waves propagates in Instructions determined by their Poynting vectors. Snell's regulation would not explain the direction of Strength stream, but it really can be employed to estimate the path of your k-vector while in the crystal.
In quasi-stage matching, the crystal substance is “poled�?to have up and down domains to counteract the section-mismatch of the fabric, where by the poling interval is certain to the wavelengths of interaction.
From a ray-design standpoint, the propagation way defines the orientation of the central (Main) ray in Figure 23. The SHG system is afflicted by the range of angles more than which incident light propagates, since mild that's not parallel on the chief ray has lowered period-matching relative into the Main ray.
As the 2nd harmonic gentle propagates, its Strength flows in a unique course than that of the basic light.
Bodily, when the basic spectrum is perfectly throughout the reference pulse spectrum, the SHG pulse intensity profile would be the square of the fundamental depth profile, effectively truncating the length. This circumstance is illustrated in Determine twenty.
Rather then decompose the SHG polarization into parts Ex and Ez, the light is often described as a unprecedented wave (E'e) using a refractive index, n'e. While in the diagram on the best, n'e, which is dependent upon θ, is indicated through the intersection of the conic portion illustrated because of the crimson ellipse While using the XZ aircraft.
Such as, take into account a essential pulse propagating above a given crystal thickness. If the temporal stroll-off is greater as opposed to duration of the fundamental pulse, this pulse will also have a spectral bandwidth that significantly exceeds the spectral width of the reference pulse. A general rule for limiting the harmful outcomes associated with both Actual physical consequences is website to pick a crystal thickness that limits the fundamental and second harmonic temporal wander-off to not more than the length of the fundamental pulse.
A5: Yes, BBO crystals have outstanding thermal steadiness and can keep their Homes at home temperature. Which means that they are often Utilized in a variety of environments without having requiring Specific temperature Regulate.
This calculation assumes a uniform beam depth profile. It's essential to now adjust this Vitality density to account for hotspots or other nonuniform depth profiles and roughly estimate a utmost Power density. For reference a Gaussian beam generally contains a highest Electricity density that is twice that in the one/e2 beam.
This wonderful-tuning capacity means that BBO crystals can cater to equally generic and really specialized wants with equivalent finesse.
When laser light is concentrated to a spot, the diameter with the beam midsection is definitely the focal location dimensions, and the rate at which The sunshine diverges in the beam waist is linked to the Rayleigh assortment (zR).
This is particularly critical in Organic and health care analysis exactly where unique compounds or cells are tagged with fluorescent markers. The 266nm mild can excite these markers, creating them jump out Plainly towards a history, therefore facilitating comprehensive Assessment.