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Beta Barium Borate (BBO) crystals are a topic of desire in the field of optics and photonics due to their one of a kind Attributes. In this post, we aim to reply ten prevalent questions about BBO crystals, offering an extensive comprehension of this interesting material.
There are two velocities that determine the propagation of light in optical media: the stage and group velocities. The phase velocity could be the velocity from the provider, the oscillation of the electrical industry, along with the velocity that is certainly matched concerning the basic and 2nd harmonic frequencies for period matching. The stage velocity relative to your pace of light inside of a vacuum is outlined with the index of refraction.
Beam diameter can also be crucial that you know when comparing hurt thresholds. Whilst the LIDT, when expressed in units of J/cm², scales independently of place measurement; substantial beam dimensions usually tend to illuminate a larger amount of defects which may result in bigger variances inside the LIDT [four].
Determine 23: This diagram illustrates a beam's focal area inside a uniaxial birefringent materials. Straight traces, symbolizing rays, are drawn through the Middle of your beam midsection. Given that the beam diverges within the beam waistline, the Electricity during the beam is dispersed more than a larger cross sectional spot.
In the situation of Type-I period matching and β-BBO crystals, the fundamental mild propagates as an extraordinary wave while in the crystal, whilst the next harmonic light-weight propagates as a standard wave.
While the above mentioned technique gives a great guideline for LIDT values, you should Get hold of Tech Support When your wavelength differs from the required LIDT wavelength. If your electricity density is below the modified LIDT from the optic, then the optic must work on your software.
As opposed to decompose the SHG polarization into parts Ex and Ez, the light is often referred to as an extraordinary wave (E'e) that has a refractive index, n'e. Within the diagram on the right, n'e, which will depend on θ, is indicated with the intersection with the conic part illustrated by the purple ellipse With all the XZ airplane.
Because the refractive index won't differ linearly with frequency in dispersive crystals like β-BBO, it is actually impossible to optimally stage match every frequency from the enter pulse's spectral range with the corresponding next harmonic frequency from the produced pulse.
A5: Of course, BBO crystals have outstanding thermal stability and can maintain their properties at room temperature. Therefore they can be Utilized in a wide range of environments without having requiring special temperature Management.
As will probably be reviewed beneath, There's a focusing numerical aperture (NA) limitation into the SHG period-matching method accurately analogous on the spectral check here period matching limitation talked about in the past segment (
This fine-tuning capability means that BBO crystals can cater to both equally generic and remarkably specialized requirements with equivalent finesse.
When an input pulse's spectral array is equal to or narrower as opposed to reference pulse, the generated next harmonic pulse incorporates a length that may be shorter by an element of one/√2 along with a spectral width which is broader by a factor of √2.
Technology of deep ultraviolet radiation at 210 nm by Type-I third harmonic era is obtained within a set of BBO crystals with conversion efficiency as significant as 36%.