Detailed Notes on BBO Crystal
Detailed Notes on BBO Crystal
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Upcoming, the facility/Electricity is either enhanced or lowered plus the optic is exposed at 10 new places. This process is repeated until eventually damage is noticed. The problems threshold is then assigned for being the best electrical power/Strength the optic can withstand without leading to problems. A histogram including that beneath signifies the tests of one BB1-E02 mirror.
Sadly, it may be very difficult to match the LIDT specification of an optic in your laser. There are numerous regimes through which a pulsed laser can destruction an optic which is based over the laser's pulse size. The highlighted columns inside the desk under outline the related pulse lengths for our specified LIDT values.
Thorlabs expresses LIDT for CW lasers like a linear electricity density calculated in W/cm. In this particular routine, the LIDT supplied being a linear energy density can be placed on any beam diameter; a person won't should compute an modified LIDT to regulate for adjustments in spot measurement, as demonstrated from the graph to the best. Normal linear electricity density could be calculated utilizing the equation underneath.
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BBO crystals have two refractive indices: ne for amazing rays and no for normal rays. The distinction between ne and no relies on the wavelength of light plus the crystal’s temperature.
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A second issue would be that the group velocity mismatch involving the next harmonic and basic-frequency pulses will lead to 1 pulse lagging the other as the two propagate. This is referred to as temporal stroll-off and can happen even less than best stage-matched situations.
The lifespan of BBO crystals can differ greatly depending on several elements. These contain how the crystals are made use of, how They may be managed, plus the ailments during which They may be stored.
It is usually essential to focus the incident light-weight during the crystal for SHG purposes, considering that productive generation of next harmonic gentle demands high peak intensities, like 109 W/cm2. When using femtosecond pulses with moderate energies during the nanojoule vary, obtaining the demanded peak intensities can require little focal places.
The effectiveness with the SHG procedure decreases significantly read more as the fundamental beam diverges from its focus, Because the pulse Electricity is dispersed throughout a bigger beam cross portion.
The spectrally narrowed SHG pulse spectrum is said to be apodized, because an effect of the elemental pulse exceeding the maximum input bandwidth Restrict could be the removing of the best and least expensive frequencies from your SHG pulse spectrum.
Third harmonic technology (THG): We use THG to evaluate our parts�?nonlinear conversion effectiveness and section-matching angle for just a specified enter wavelength. We make sure that our products fulfill the specs for THG apps.
Humidity might cause water absorption over the crystal surface, which can degrade its optical effectiveness. The standard of the incident mild, which includes its wavelength, depth, and polarization, could also influence the performance of BBO crystals in a variety of programs.