a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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The superior harm threshold of BBO crystals is particularly critical in environments wherever substantial-intensity lasers will be the norm. Conventional resources may falter, degrade, or maybe break below this sort of intensities.
Regretably, it may be very difficult to compare the LIDT specification of an optic to the laser. There are actually numerous regimes wherein a pulsed laser can destruction an optic which is predicated to the laser's pulse size. The highlighted columns in the desk down below define the pertinent pulse lengths for our specified LIDT values.
Good day, thank you for calling Thorlabs. The wavelength ranges from the antireflective coatings on these β-BBO crystals align Together with the respective wavelength bands that these crystals are optimized for. Requests for customizations can be created by achieving out to us at [email protected]
Beam diameter is likewise crucial that you know when evaluating destruction thresholds. Though the LIDT, when expressed in units of J/cm², scales independently of spot sizing; massive beam sizes usually tend to illuminate a larger number of defects which may result in larger variances within the LIDT [4].
From a ray-product perspective, the propagation path defines the orientation on the central (chief) ray in Determine 23. The SHG approach is impacted by the array of angles in excess of which incident light-weight propagates, for the reason that mild that isn't parallel to your Main ray has reduced period-matching relative towards the Main ray.
When the Rayleigh selection is a lot less than the crystal thickness, the distance above which the beam is optimally extreme is less than the crystal thickness.
Humidity can cause h2o absorption within the crystal surface, which can degrade its optical performance. The standard of the incident mild, such as its wavelength, depth, and polarization, also can have an effect on the overall performance of BBO crystals in various apps.
As illustrated in the following desk, the shorter the crystal, the wider the reference pulse spectrum. The desk underneath assumes a basic Heart wavelength from the in the vicinity of-IR.
Considering that the refractive index won't range linearly with frequency in dispersive crystals like β-BBO, it really is not possible to optimally section match just about every frequency while in the input pulse's spectral range Together with the corresponding second harmonic frequency during the created pulse.
The temporal stroll-off of the slower pulse with respect into the a lot quicker is usually a considerable portion of the heartbeat length. That is illustrated in Figure 22.
The team velocity as well as the section velocity usually are not equivalent, meaning the sine wave on the provider along with the envelope of the heartbeat transfer by optical media at different speeds.
When selecting an SHG crystal, the heartbeat length with read more the laser resource should be taken into consideration. A mismatch amongst the period and crystal thickness will produce SHG pulses lengthier in time and narrower in spectral material than possible below excellent ailments.
The Actual physical, chemical, optical, and thermal Homes from the α -BBO are comparable to People of the BBO crystals, although the α -BBO will not show the nonlinear optical Homes because of the central symmetry of its crystal framework.
This post dives deep into the benefits and distinctive Homes of BBO crystal and its paramount great importance in effective frequency doubling and harmonics era at 266nm.