A Secret Weapon For a-BBO Crystal
A Secret Weapon For a-BBO Crystal
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The elemental industry now driving the Type-I SHG approach is the Eoγ part of the incident area. At γ = 90°, there would be zero SHG output, Considering that the travel industry Eoγ = 0.
However, it might be very hard to match the LIDT specification of the optic in your laser. You'll find several regimes during which a pulsed laser can damage an optic and this is based over the laser's pulse length. The highlighted columns while in the desk below outline the appropriate pulse lengths for our specified LIDT values.
The Power in the two waves propagates in directions determined by their Poynting vectors. Snell's legislation isn't going to explain the course of Power flow, but it surely can be used to compute the course with the k-vector during the crystal.
This efficiency is vital, specially when a single considers the generation on the 266nm wavelength, wherever even minimal inefficiencies can lead to major Electrical power losses.
Figure 23: This diagram illustrates a beam's focal area in a uniaxial birefringent content. Straight traces, symbolizing rays, are drawn throughout the Middle in the beam midsection. As being the beam diverges with the beam waistline, the Power while in the beam is distributed above a bigger cross sectional place.
You should Notice that Now we have a buffer crafted between the specified injury thresholds on the web and the tests which Now we have completed, which accommodates variation concerning batches. On ask for, we can provide individual examination details and also a tests certification.
Their superior injury threshold and excellent thermal stability make them suitable for use in superior-electrical power laser devices, although their huge transparency assortment enables them to operate using a broad range of laser wavelengths.
Such a functionality is invaluable in scenarios the place a particular gentle frequency is needed, but the source doesn’t In a natural way deliver it. By employing BBO’s Qualities, scientists and engineers can efficiently “tune�?their mild resources to ideal frequencies.
Pumped via the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength array in between 422nm and 477nm is observed by angle-tuning a kind I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields a lot more than 50µJ (maximum a hundred thirtyµJ),
The SHG mild is polarized within the XZ airplane and is orthogonal to both the Eo plus the k-vector. Instead of decompose the polarization in the SHG light-weight into Ex and Ez components, the electric discipline is often described as an extraordinary wave (E'e). The refractive index for this amazing wave, n'e, adjustments as a operate of θ. n'e(θ) can be calculated utilizing the equation in Figure 13. The ellipse defining the extraordinary index of refraction being a purpose of θ is usually a conic section of the index ellipsoid.
This calculation assumes a uniform beam depth profile. You should now alter this Vitality density to account a-BBO Crystal for hotspots or other nonuniform intensity profiles and roughly estimate a highest Power density. For reference a Gaussian beam generally contains a utmost Vitality density that is certainly twice that of the one/e2 beam.
This good-tuning functionality ensures that BBO crystals can cater to both generic and really specialised needs with equivalent finesse.
When laser light-weight is focused to a spot, the diameter of the beam midsection is definitely the focal place dimension, and the rate at which the light diverges with the beam waistline is linked to the Rayleigh vary (zR).
Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Sadly, this is extremely dependent on factors such as absorption and thermal diffusivity, so there isn't any reliable method for pinpointing every time a high PRF laser will destruction an optic as a consequence of thermal effects.