The Definitive Guide to a-BBO Crystal
The Definitive Guide to a-BBO Crystal
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The length on the SHG crystal appreciably affects the spectral width on the reference pulse, or alternatively the bandwidth on the SHG filter.
Although this general guideline provides a common development, It's not necessarily a quantitative Assessment of LIDT vs wavelength. In CW applications, for instance, injury scales a lot more strongly with absorption within the coating and substrate, which would not always scale well with wavelength.
The stage matching angle may be adjusted by rotating the crystal within the y axis. An adjustment that is usually in a couple degrees can possibly enhance the performance of the crystal within the setup or match another basic frequency within the crystal's operating vary.
Figure 23: This diagram illustrates a beam's focal area in a very uniaxial birefringent material. Straight lines, representing rays, are drawn through the Middle of your beam waist. Given that the beam diverges with the beam waist, the Electrical power from the beam is distributed above a bigger cross sectional location.
Thorlabs expresses LIDT for CW lasers being a linear power density measured in W/cm. With this regime, the LIDT presented like a linear ability density is often placed on any beam diameter; a person would not must compute an adjusted LIDT to adjust for modifications in location measurement, as demonstrated through the graph to the best. Common linear electrical power density might be calculated using the equation below.
When the above mentioned course of action offers a fantastic general guideline for LIDT values, remember to contact Tech Help In case your wavelength differs from get more info the specified LIDT wavelength. In case your electricity density is less than the adjusted LIDT of your optic, then the optic must function for your application.
Such a capability is invaluable in situations wherever a certain mild frequency is needed, though the resource doesn’t By natural means supply it. By employing BBO’s properties, scientists and engineers can efficiently “tune�?their mild sources to wished-for frequencies.
BBO crystals is usually ordered from many suppliers specializing in optical resources. It’s crucial that you select a trustworthy supplier to be certain the standard of the crystals.
Nevertheless, there is no 2nd purchase nonlinear result in alpha-BBO crystal due to the centrosymmetry in its crystal construction and therefore it's got no use for second buy nonlinear optical procedures. Alternatively, alpha-BBO is greatly used for fabrication of polarizers, polarizing beam displacers, section retarders, birefringent plates, and time delay compensators especially Those people for UV and substantial power lasers.
A: The wide transparency array gives versatility, permitting BBO crystals for use across a various selection of wavelengths and apps.
When selecting an SHG crystal, the pulse period from the laser source have to be taken into consideration. A mismatch amongst the period and crystal thickness will bring on SHG pulses lengthier in time and narrower in spectral articles than attainable beneath suitable situations.
The Actual physical, chemical, optical, and thermal Qualities on the α -BBO are much like These of your BBO crystals, nevertheless the α -BBO won't show the nonlinear optical Houses because of the central symmetry of its crystal composition.
This informative article dives deep into the advantages and special Houses of BBO crystal and its paramount value in productive frequency doubling and harmonics era at 266nm.