5 Simple Techniques For BBO Crystal
5 Simple Techniques For BBO Crystal
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Non-linear Optical (NLO) crystals deliver an enormously versatile Alternative for making new wavelengths from current, off-the-shelf laser sources. The optical wavelength spectrum is utilized by a substantial and continuously increasing a number of purposes, from producing of health care lasers, quantum networking & computing through to environmental sensing as well as lots of Other individuals.
The problem that arises when utilizing ultrashort pulses for next harmonic era (SHG) is that shorter pulses have much larger bandwidths, but The perfect period-matched problem might be obtained For under a single elementary wavelength at any given time. Because of this, the caliber of the stage match may be noticeably worse in the direction of the spectral edges of wide-bandwidth pulses.
Once the Rayleigh vary is under the crystal thickness, the space above which the beam is optimally powerful is under the crystal thickness.
The performance of BBO crystals can be motivated by many aspects. The caliber of the crystal itself is paramount, as defects or impurities can degrade its optical Homes. The temperature at which the crystal operates also can have an affect on its functionality, as alterations in temperature can cause thermal growth or contraction, potentially altering the crystal’s optical Homes.
Hygroscopic crystal materials deteriorate when they're not usually held in sufficiently dry air (or possibly a dry purge gasoline). This is applicable e.g. to KDP and BBO, and in a lesser extent to LBO. It could be handy to keep such a crystal at a fairly elevated temperature, which makes it simpler to hold it dry.
They exhibit excellent homogeneity around big volumes and have a higher harm threshold, but are hygroscopic and also have a small nonlinearity.
The phase velocity is the speed at which the sector provider, i.e. the sine wave, travels in a fabric. The rate at which a pulse envelope travels in a fabric is known as the team velocity and defines the pace on the energy packet comprising the optical pulse traveling via the material.
Presented these programs, it’s evident why BBO, with its inherent functionality to efficiently generate the 266nm wavelength, is so highly prized. The crystal’s exclusive nonlinear optical properties allow the conversion of other wavelengths into your coveted 266nm light, guaranteeing that researchers and industries have usage of this important tool.
BBO crystals are delicate and involve thorough handling to forestall damage to their surfaces. They ought to be dealt with with thoroughly clean, lint-no cost gloves to stop scratching or contaminating their surfaces. When not in use, BBO crystals should be saved in a interesting, dry area away from direct daylight, as prolonged exposure to heat and lightweight can degrade their optical Houses.
The Electrical power density of your beam ought to be calculated regarding J/cm2. The graph to the right demonstrates why expressing the LIDT being an Electricity density delivers the most effective metric for brief pulse resources. On this regime, the LIDT specified being an energy density could be placed on any beam diameter; 1 won't should compute an modified LIDT to regulate for alterations in location sizing.
We use Numerical Aperture (NA) to describe the extent of this angular written content. Preferably, the elemental laser light can be collimated through the entire crystal, since collimated light resembles a group of rays aligned to a similar course with the NA of zero.
BBO nonlinear crystal is actually a destructive uniaxial crystal. It offers phase matching for many 2nd-purchase interactions Just about above its complete transparency range. This transparency ranges from 185 nm to 3.three µm, as inferred from transmittance measurements utilizing crystal samples of a few mm thickness.
Any contamination can degrade the optical effectiveness of your crystal and probably trigger problems less than superior laser electricity. When storing BBO crystals, they ought to be placed in the protecting case to circumvent physical problems and dirt check here accumulation.
The 266nm wavelength features precise interactions that other wavelengths can’t, making it indispensable for detecting and learning selected compounds.