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The 266nm wavelength provides specific interactions that other wavelengths can’t, which makes it indispensable for detecting and researching specified compounds.
Although this rule of thumb supplies a standard pattern, It is far from a quantitative Evaluation of LIDT vs wavelength. In CW programs, As an illustration, harm scales much more strongly with absorption while in the coating and substrate, which does not always scale perfectly with wavelength.
As opposed to the reference pulse power spectrum comprising an apodization filter, from the spatial area the filter could be in NA. The angular domain apodization filter nevertheless, is simply in a single-dimension outlined from the airplane k and .
Several aspects can influence the general performance of BBO crystals. These contain temperature, humidity, and the quality of the incident gentle. Good handling and storage can assist maintain the crystal’s overall performance. Temperature can have an impact on the period-matching situations of BBO crystals, which subsequently has an effect on their performance in frequency conversion purposes.
They even have a significant hurt threshold, permitting them to take care of high-power laser beams without the need of degradation. These special properties make BBO crystals a flexible Resource in many optical applications.
Figure eighteen: The regular and incredible refractive indices of β-BBO change with frequency and wavelength because of a fabric house termed dispersion. Dispersion exists in all media other than vacuum.
When an optic is destroyed by a continuous wave (CW) laser, it is normally due to melting from the floor due to absorbing the laser's Electricity or harm to the optical coating (antireflection) [one]. Pulsed lasers with pulse lengths lengthier than 1 µs might be addressed as CW lasers for LIDT conversations.
Taken collectively, these numerous purposes underscore the enormous worth BBO crystals provide to various sectors. Via its unparalleled 266nm generation, the BBO crystal is not only a Device but more info a catalyst, propelling enhancements throughout distinctive fields.
Hence, the 2nd harmonic pulse spectrum, revealed on the best, provides a spectral width somewhere around similar to The best case. Preferably, each frequency in the elemental pulse spectrum can be simultaneously period matched.
The basic source may be the dye laser radiation pumped by the next harmonic of the Q-switched Nd: YAG laser. A stroll-off compensated configuration Along with the BBO crystal pair has enabled us to appreciate this kind of superior conversion performance from the conversation.
For beams which has a superior PRF both equally the normal and peak powers must be when compared with the equal CW electric power. Also, for hugely transparent materials, You can find very little to no drop within the LIDT with expanding PRF.
When laser mild is focused into a place, the diameter in the beam waist will be the focal place dimension, and the rate at which The sunshine diverges within the beam midsection is relevant to the Rayleigh selection (zR).
This informative article dives deep into the benefits and distinctive Qualities of BBO crystal and its paramount significance in economical frequency doubling and harmonics generation at 266nm.