What Does BBO Crystal Mean?
What Does BBO Crystal Mean?
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When selecting an SHG crystal, the heart beat period of your laser supply needs to be taken into account. A mismatch between the period and crystal thickness will bring on SHG pulses longer in time and narrower in spectral written content than feasible less than perfect circumstances.
Their substantial destruction threshold and exceptional thermal security make them ideal for use in large-energy laser techniques, although their vast transparency selection makes it possible for them to operate that has a wide range of laser wavelengths.
Thorlabs expresses LIDT for CW lasers being a linear electricity density calculated in W/cm. With this routine, the LIDT presented as being a linear electrical power density might be placed on any beam diameter; a single would not really need to compute an adjusted LIDT to regulate for alterations in place size, as shown via the graph to the ideal. Common linear electricity density might be calculated utilizing the equation down below.
, the angle in between The sunshine's propagation path and the crystal's optic axis is often tuned so the refractive index of a certain frequency (ω) in the basic enter pulse particularly equals the refractive index of twice the input frequency (2ω). It truly is common to improve phase matching ailments to the frequency at about the middle of the heartbeat's bandwidth.
The calculation previously mentioned assumes a uniform beam intensity profile. You have to now contemplate hotspots within the beam or other non-uniform intensity profiles and about estimate a highest check here electrical power density.
The cutting angle relies upon on the popular stage-matching issue for frequency conversion apps. Phase matching describes matching the stage speeds of various beams connected to nonlinear processes so they Create up constructively over fars away Within the crystal.
A second concern would be that the group velocity mismatch amongst the next harmonic and fundamental-frequency pulses will result in one pulse lagging the other as the two propagate. This known as temporal walk-off and can occur even below optimal period-matched conditions.
A: A high problems threshold makes certain the crystal can tackle much more electrical power with out degrading, bringing about extended lifespan and consistent efficiency.
The Vitality density of your beam must be calculated with regards to J/cm2. The graph to the appropriate shows why expressing the LIDT being an Electrical power density offers the very best metric for brief pulse resources. In this regime, the LIDT supplied being an Vitality density may be placed on any beam diameter; a single does not should compute an altered LIDT to regulate for modifications in location dimensions.
Large nonlinear coefficients: BBO crystals have sizeable nonlinear coefficients that make economical frequency conversion processes with minimal enter electricity requires feasible.
The manufacture of Beta-Barium Borate (BBO) crystals is a posh and meticulous course of action that needs a substantial volume of precision and expertise. This method, known as the flux system, starts While using the preparing of a combination of barium borate and barium fluoride.
As will be reviewed beneath, You will find a concentrating numerical aperture (NA) limitation on the SHG section-matching method just analogous on the spectral section matching limitation talked over from the earlier part (
Any imperfections while in the reducing system could potentially have an impact on the optical Houses from the crystals.