Not known Facts About a-BBO Crystal
Not known Facts About a-BBO Crystal
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The crystal axis is c. The Main ray is parallel towards the way accustomed to evaluate the tuning angle (θ), that's optimized in the course of period matching. Conversion efficiency is optimized for rays parallel to your chief ray and even worse for rays at more substantial angles (ψ) towards the Main ray.
The 266nm wavelength gives unique interactions that other wavelengths can’t, rendering it indispensable for detecting and researching specified compounds.
Any scratches can degrade the optical functionality with the crystal and likely bring about problems less than superior laser power. For stubborn stains, an answer of delicate detergent or isopropyl Liquor may be gently placed on the crystal surface and then rinsed off with distilled water.
As Earlier said, pulsed lasers commonly induce a special variety of damage to the optic than CW lasers. Pulsed lasers frequently will not heat the optic plenty of to break it; as an alternative, pulsed lasers deliver powerful electric powered fields capable of inducing dielectric breakdown in the fabric.
We use Numerical Aperture (NA) to describe the extent of the angular material. Ideally, the fundamental laser gentle could well be collimated all through the crystal, since collimated mild resembles a gaggle of rays aligned to the identical way with the NA of zero.
Thorlabs expresses LIDT for CW lasers as a linear power density calculated in W/cm. In this particular regime, the LIDT provided as a linear power density can be placed on any beam diameter; a single does not should compute an modified LIDT to regulate for improvements in place dimension, as shown because of the graph to the appropriate. Average linear electric power density might be calculated using the equation down below.
Bodily, when the fundamental spectrum is effectively inside the reference pulse spectrum, the SHG pulse intensity profile could be the sq. of the basic intensity profile, properly truncating the length. This circumstance is illustrated in Determine 20.
Nevertheless, whilst BBO crystals can work at place temperature, Serious temperatures should nevertheless be averted as they will have an effect on the crystal’s section-matching ailments and probably induce problems.
When pulse lengths are amongst one ns and 1 µs, laser-induced damage can arise either due to absorption or maybe a dielectric breakdown (consequently, a person should Test both CW and pulsed LIDT). Absorption is either because of an intrinsic residence of the optic or as a result of floor irregularities; Hence LIDT values are only legitimate for optics meeting or exceeding the area good quality technical specs offered by a producer.
The temporal walk-off from the slower pulse with respect to the quicker may be a substantial fraction of the heart beat period. This is often illustrated in Determine 22.
This calculation assumes a uniform beam intensity profile. You have to now change this Vitality density to account for hotspots or other nonuniform depth profiles and about estimate a most Strength density. For reference a Gaussian beam normally features a highest Strength density that may be 2 times that of the one/e2 beam.
This characteristic interprets to lessened will need for click here intensive thermal administration devices, yet again accentuating Value personal savings and technique simplicity.
The next harmonic light is then polarized parallel into the aircraft. Angle tuning adjusts θ and it is executed by rotating the crystal throughout the Y-axis.
Lastly, spectroscopy, the review of interactions among matter and electromagnetic radiation, considerably Rewards within the 266nm era. In spectroscopic purposes, distinct wavelengths of sunshine interact in different ways with materials, delivering a spectrum that can be analyzed to find out the fabric’s Qualities or composition.