The Single Best Strategy To Use For a-BBO Crystal
The Single Best Strategy To Use For a-BBO Crystal
Blog Article
The large hurt threshold of BBO crystals is particularly important in environments where by substantial-intensity lasers would be the norm. Traditional materials could possibly falter, degrade, or even crack less than this kind of intensities.
The team velocities of the fundamental and second harmonic pulses are also different, even though stage-matched, along with the magnitude from the team velocity mismatch relies on the crystal Homes and also the optical frequencies in the pulses.
Any scratches can degrade the optical functionality of your crystal and likely trigger damage under superior laser electrical power. For stubborn stains, an answer of gentle detergent or isopropyl alcohol could be Carefully placed on the crystal surface area and afterwards rinsed off with distilled water.
In place of the reference pulse electricity spectrum comprising an apodization filter, during the spatial domain the filter would be in NA. The angular area apodization filter nonetheless, is just in one-dimension defined via the aircraft k and .
Several components can have an effect on the effectiveness of BBO crystals. These involve temperature, humidity, and the caliber of the incident light. Correct handling and storage can assist keep the crystal’s functionality. Temperature can have an affect on the section-matching conditions of BBO crystals, which subsequently affects their performance in frequency conversion apps.
Specified these purposes, it’s evident why BBO, with its inherent capacity to effectively develop the 266nm wavelength, is so extremely prized. The crystal’s special nonlinear optical Homes allow the conversion of other wavelengths in the coveted 266nm gentle, making certain that scientists and industries have access to this vital tool.
Bodily, when the fundamental spectrum is well throughout the reference pulse spectrum, the SHG pulse intensity profile is the sq. of the fundamental depth profile, properly truncating the length. This scenario is illustrated in Figure twenty.
The Bodily, chemical, optical, and thermal Houses of the α -BBO are similar to Individuals in the BBO crystals, nevertheless the α -BBO won't show the nonlinear optical Houses due to central symmetry of its crystal composition.
Now Look at the maximum Power density to that that's specified because the LIDT for the optic. If your optic was tested at a wavelength besides your functioning wavelength, the damage threshold need to be scaled appropriately [3].
The temporal stroll-off from the slower pulse with regard for the more quickly could be a substantial portion of the pulse duration. This is illustrated in Figure 22.
Equally wide-bandwidth pulses and temporal walk-off lead to a discount in the conversion effectiveness, as well as worsen more info the optical quality of the second harmonic pulses. The suitable crystal thickness should be picked to attenuate both consequences.
The angular written content with the resultant SHG pulse, or beam, during the dimension of your angular filter is lessened from a super scenario. Within the perpendicular dimension, the SHG beam preserves the angular written content in the enter beam, considering that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. within the horizontal and vertical dimensions, causes an elliptical beam.
The Actual physical, chemical, optical, and thermal Attributes from the α -BBO are similar to those of your BBO crystals, but the α -BBO doesn't show the nonlinear optical Attributes as a result of central symmetry of its crystal construction.
Pulsed lasers with higher pulse repetition frequencies (PRF) might behave in the same way to CW beams. Unfortunately, this is extremely depending on aspects like absorption and thermal diffusivity, so there isn't any trusted technique for analyzing every time a significant PRF laser will problems an optic because of thermal outcomes.