The best Side of a-BBO Crystal
The best Side of a-BBO Crystal
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The calculation previously mentioned assumes a uniform beam intensity profile. It's essential to now take into account hotspots in the beam or other non-uniform intensity profiles and roughly work out a greatest electricity density.
The group velocities of the fundamental and next harmonic pulses also are various, even when period-matched, as well as the magnitude of your group velocity mismatch is determined by the crystal properties plus the optical frequencies from the pulses.
The Rayleigh vary quantifies the distance, calculated in the beam waist, around which the beam diameter is around continual. The shorter the Rayleigh array, the more substantial the rate of divergence.
In quasi-phase matching, the crystal substance is “poled�?to get up and down domains to counteract the phase-mismatch of the fabric, exactly where the poling period is unique to the wavelengths of interaction.
The Electrical power density of one's beam ought to be calculated with regards to J/cm2. The graph to the best displays why expressing the LIDT as an Power density offers the top metric for short pulse resources. During this regime, the LIDT provided as an Electrical power density is often applied to any beam diameter; a single isn't going to have to compute an altered LIDT to adjust for changes in spot dimensions.
Now Review the most electrical power density to that that is specified since the LIDT for the optic. When the optic was analyzed at a wavelength in addition to your functioning wavelength, the hurt threshold have to be scaled appropriately.
Even though the check benefits are only representative of one coating operate, Thorlabs specifies problems threshold values that account for coating variances.
a-BBO crystals which has a wedge angle (α) is often custom fabricated with the desired orientation of your optical axis. A paired or this kind of prisms While using the optical axes orthogonal to one another may be used to consistently adjust the section shift or time hold off concerning two orthogonally polarized pulses.
Pumped through the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength assortment involving 422nm and 477nm has become noticed by angle-tuning a type I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields over fiftyµJ (optimum a hundred thirtyµJ),
Nevertheless, there isn't a next order nonlinear influence in alpha-BBO crystal because of the centrosymmetry in its crystal structure and therefore it's got no use for second purchase nonlinear optical processes. As a substitute, alpha-BBO is extensively useful for fabrication of polarizers, polarizing beam displacers, stage retarders, birefringent plates, and time hold off compensators Specifically those for UV and large ability lasers.
Every single side of BBO, from its atomic structure to its wide software spectrum, underscores get more info its pivotal job in modern science and technological know-how.
This attribute translates to lowered will need for intensive thermal administration programs, once more accentuating Price discounts and procedure simplicity.
The temporal stroll-off is usually regarded as serious when the temporal lag exceeds the length of the basic pulse. Significant stroll-off may end up in temporal lag that irreparably boosts the duration from the output second harmonic pulse.
This article dives deep into the advantages and exclusive Attributes of BBO crystal and its paramount significance in productive frequency doubling and harmonics era at 266nm.