About a-BBO Crystal
About a-BBO Crystal
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Figure fifteen displays the orientation of γ in the laboratory frame rotation of your crystal. In this example situation, the nonlinear crystal is mounted within an RSP1 rotation mount along with an RP01 rotation phase. Improvements in γ and θ adjust the orientation of the optic axis, . In such cases, changes in γ happen to be accustomed to align While using the horizontal plane and on the list of principle ordinary axes vertically. For a vertically polarized input beam, this orientation lets the rotation phase for use to adjust θ.
However, it might be very difficult to check the LIDT specification of an optic to the laser. There are numerous regimes during which a pulsed laser can damage an optic which is based on the laser's pulse length. The highlighted columns during the desk under define the related pulse lengths for our specified LIDT values.
Hi there, thanks for speaking to 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 may be made by reaching out to us at [email protected]
Having said that, it’s vital that you Take note that when BBO crystals can tackle superior electrical power, they must nevertheless be utilised within just their specified electric power selection to prevent prospective destruction and guarantee optimum efficiency.
From the ray-design point of view, the propagation course defines the orientation from the central (chief) ray in Figure 23. The SHG course of action is affected through the choice of angles over which incident mild propagates, for the reason that mild that isn't parallel to the chief ray has lowered phase-matching relative towards the Main ray.
Now compare the utmost power density to that which can be specified as being the LIDT for the optic. If your optic was tested at a wavelength besides your functioning wavelength, the harm threshold should be scaled appropriately.
Even though the above course of action supplies a fantastic rule of thumb for LIDT values, remember to contact Tech Support If the wavelength differs from the specified LIDT wavelength. When your ability density is a lot less than the altered LIDT on the optic, then the optic need to work in your application.
Some brands' SHG crystals, like Thorlabs', deliver close to-stage-matched disorders for Usually incident input gentle for just a specified fundamental frequency. These check here companies polish the faces in the SHG crystals these kinds of which the angle involving the Commonly incident mild as well as the optic axis may be the phase-matched angle for the specified frequency.
For instance, take into account a essential pulse propagating above a supplied crystal thickness. When the temporal walk-off is larger as opposed to period of the fundamental pulse, this pulse will also have a spectral bandwidth that enormously exceeds the spectral width from the reference pulse. A standard rule for restricting the detrimental results connected to each physical results is to select a crystal thickness that boundaries the basic and 2nd harmonic temporal wander-off to no more than the duration of the fundamental pulse.
With correct care and managing, BBO crystals can past for quite some time. Nonetheless, their lifespan may be shortened by elements which include significant temperature, humidity, and physical destruction. BBO crystals are robust and sturdy, but Like every optical ingredient, they could degrade eventually if not thoroughly cared for.
The two broad-bandwidth pulses and temporal wander-off cause a discount within the conversion efficiency, along with worsen the optical good quality of the second harmonic pulses. The appropriate crystal thickness need to be selected to reduce both equally effects.
Beta Barium Borate (BBO) crystals have taken the earth of photonics by storm. One of the more spectacular aspects of these crystals is their groundbreaking purpose in 266nm technology.
The Bodily, chemical, optical, and thermal Attributes with the α -BBO are much like All those from the BBO crystals, though the α -BBO will not show the nonlinear optical properties due to the central symmetry of its crystal framework.
In frequency conversion, BBO crystals are utilized to change the color of laser mild, enabling the creation of a wide array of shades that are not straight accessible from readily available laser sources. In electro-optic modulation, They're applied to control the depth, section, polarization, or route of a laser beam.