The best Side of a-BBO Crystal
The best Side of a-BBO Crystal
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The calculation earlier mentioned assumes a uniform beam intensity profile. You should now contemplate hotspots inside the beam or other non-uniform intensity profiles and roughly work out a most electrical power density.
However, it may be very hard to compare the LIDT specification of an optic on your laser. You can find a number of regimes through which a pulsed laser can problems an optic and this is based on the laser's pulse size. The highlighted columns in the table under outline the applicable pulse lengths for our specified LIDT values.
In order to use the specified CW destruction threshold of an optic, it is necessary to grasp the following:
In summary, BBO crystals are a fascinating and flexible substance which includes appreciably Superior the field of optics and photonics. By comprehension their Qualities and how to deal with them, we are able to continue to harness their potential and push further more improvements in optical know-how.
The Electricity density of your respective beam need to be calculated when it comes to J/cm2. The graph to the ideal exhibits why expressing the LIDT being an Electricity density provides the best metric for brief pulse resources. In this particular routine, the LIDT specified being an Strength density can be applied to any beam diameter; one would not should compute an adjusted LIDT to adjust for alterations in location measurement.
Thorlabs expresses LIDT for CW lasers for a linear ability density measured in W/cm. Within this regime, the LIDT given as being a linear energy density is often applied to any beam diameter; 1 doesn't need to compute an altered LIDT to regulate for adjustments in spot measurement, as demonstrated from the graph to the proper. Common linear electrical power density could be calculated using the equation down below.
Physically, when the elemental spectrum is effectively inside the reference pulse spectrum, the SHG pulse depth profile could be the square of the basic intensity profile, proficiently truncating the length. This case is illustrated in Figure 20.
The destruction Investigation will be get more info carried out on an analogous optic (buyer's optic won't be weakened). Testing may possibly cause additional expenditures or direct times. Get hold of Tech Help For more info.
When pulse lengths are between 1 ns and one µs, laser-induced harm can arise possibly as a consequence of absorption or even a dielectric breakdown (therefore, a user have to check both equally CW and pulsed LIDT). Absorption is either on account of an intrinsic property with the optic or as a consequence of surface irregularities; thus LIDT values are only legitimate for optics Conference or exceeding the surface area high-quality specifications presented by a company.
It’s like taking only one Be aware and splitting it into two harmonious tones. This process might be vital in quite a few State-of-the-art optical experiments and technologies.
As will be reviewed underneath, There's a focusing numerical aperture (NA) limitation for the SHG phase-matching system particularly analogous into the spectral section matching limitation talked over inside the past portion (
When evaluating an LIDT specified to get a pulsed laser to the laser, it is important to know the subsequent:
Thermal fluctuations are a priority in lots of experimental and industrial setups. Nonetheless, BBO crystals�?intrinsic thermal balance makes sure that they don’t just endure but prosper in this kind of situations.
Pulsed lasers with higher pulse repetition frequencies (PRF) might behave similarly to CW beams. Regretably, this is very depending on components including absorption and thermal diffusivity, so there isn't any trustworthy strategy for determining any time a superior PRF laser will destruction an optic resulting from thermal results.