The Single Best Strategy To Use For a-BBO Crystal
The Single Best Strategy To Use For a-BBO Crystal
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The elemental discipline now driving the kind-I SHG process is the Eoγ part of the incident industry. At γ = 90°, there would be zero SHG output, Because the travel discipline Eoγ = 0.
Beta Barium Borate (BBO) crystals are already a topic of curiosity in the sphere of optics and photonics due to their exceptional Homes. In this article, we goal to answer 10 typical questions about BBO crystals, delivering a comprehensive idea of this fascinating product.
While this general guideline presents a common craze, It is far from a quantitative Examination of LIDT vs wavelength. In CW purposes, As an example, problems scales much more strongly with absorption from the coating and substrate, which will not essentially scale very well with wavelength.
This performance is important, especially when a person considers the era in the 266nm wavelength, in which even minimal inefficiencies can cause sizeable Strength losses.
Quite a few aspects can impact the general performance of BBO crystals. These include temperature, humidity, and the quality of the incident light. Appropriate handling and storage may also help preserve the crystal’s performance. Temperature can have an affect on the period-matching problems of BBO crystals, which in turn affects their performance in frequency conversion programs.
Now Look at the most power density to that that is specified because the LIDT for your optic. In the event the optic was tested at a wavelength apart from your operating wavelength, the harm threshold has to be scaled properly.
Determine 18: The regular and incredible refractive indices of β-BBO change with frequency and wavelength because of a material house named dispersion. Dispersion exists in all media apart from vacuum.
When an optic is weakened by a constant wave (CW) laser, it is usually due to melting on the area as a result of absorbing a-BBO Crystal the laser's Vitality or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths extended than one µs is usually treated as CW lasers for LIDT conversations.
For the reason that refractive index isn't going to fluctuate linearly with frequency in dispersive crystals like β-BBO, it's impossible to optimally period match each and every frequency in the enter pulse's spectral assortment Using the corresponding 2nd harmonic frequency within the generated pulse.
The SHG light-weight is polarized while in the XZ plane and is orthogonal to both of those the Eo plus the k-vector. As an alternative to decompose the polarization in the SHG light-weight into Ex and Ez parts, the electric subject is typically called a rare wave (E'e). The refractive index for this incredible wave, n'e, alterations as a operate of θ. n'e(θ) is usually calculated using the equation in Determine thirteen. The ellipse defining the remarkable index of refraction for a perform of θ can be a conic part in the index ellipsoid.
Both broad-bandwidth pulses and temporal walk-off lead to a reduction from the conversion performance, in addition to worsen the optical top quality of the next harmonic pulses. The suitable crystal thickness need to be chosen to minimize the two results.
When choosing an SHG crystal, the pulse duration on the laser resource must be taken into consideration. A mismatch involving the duration and crystal thickness will result in SHG pulses more time in time and narrower in spectral information than probable less than ideal conditions.
In essence, to comprehend the BBO Crystal is to grasp the guts of cutting-edge optical science. It’s a cloth that doesn’t just get involved in the earth of photonics but actively shapes and drives its frontier.
The spectrally narrowed SHG pulse spectrum is said for being apodized, given that an influence of the fundamental pulse exceeding the maximum input bandwidth limit may be the elimination of the very best and cheapest frequencies with the SHG pulse spectrum.