5 Simple Techniques For BBO Crystal
5 Simple Techniques For BBO Crystal
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Optical parametric oscillation (OPO): We make the most of OPO to determine our objects�?nonlinear conversion functionality and stage-matching angle for just a specified input wavelength and sign/idler wavelengths. We make sure that our products meet up with the necessities for OPO programs.
Nevertheless, it’s crucial that you Observe that although BBO crystals can transmit UV light-weight, they should be handled with care when Employed in UV purposes to forestall probable harm to the crystal and make certain protection.
These Homes make BBO crystals extremely appealing in many purposes, from laser frequency conversion to electro-optic modulation. Their huge transparency range lets them to operate having a wide array of laser wavelengths, though their superior injury threshold makes sure they're able to handle higher-ability laser beams with no degradation.
The SHG light-weight is polarized from the XZ aircraft which is orthogonal to the two the Eo as well as k-vector. As opposed to decompose the polarization with the SHG gentle into Ex and Ez elements, the electric area is usually described as a unprecedented wave (E'e). The refractive index for this extraordinary wave, n'e, variations to be a functionality of θ. n'e(θ) can be calculated utilizing the equation in Figure thirteen. The ellipse defining the incredible index of refraction as being a function of θ is really a conic portion of your index ellipsoid.
, the angle involving The sunshine's propagation direction as well as the crystal's optic axis might be tuned so which the refractive index of a selected frequency (ω) in the fundamental input pulse exactly equals the refractive index of 2 times the input frequency (twoω). It can be standard to enhance section matching problems with the frequency at around the middle of the heartbeat's bandwidth.
The team velocity is definitely the speed of the heart beat, or more formally the envelope of the electric subject. The team index similarly governs the speed on the envelope relative to your speed of sunshine in a vacuum and is particularly depending on the dispersion of the fabric.
The second harmonic frequency wave is generated as a unprecedented wave, that's polarized orthogonal to the elemental-frequency ordinary wave.
This distinctive combination ensures that β-BBO crystal is usually a promising prospect for nonlinear optical applications for example frequency converters and optical parametric oscillators. In quantum optics, β-BBO crystal can make entangled photon pairs and 10-photon entanglement.
These procedures contain blending two or even more input beams of sunshine with many frequencies to generate a outcome beam using a new frequency.
The energy density of the beam should be calculated regarding J/cm2. The graph to the right displays why expressing the LIDT as an Vitality density provides the best metric for short pulse sources. With this routine, the LIDT specified as an Power density might be applied to any beam diameter; one particular will not should compute an adjusted LIDT to regulate for alterations in place measurement.
We use Numerical Aperture (NA) to explain the extent of this angular content. Ideally, the fundamental laser light might be collimated through the crystal, since collimated gentle resembles a gaggle of rays aligned to a similar route with here the NA of zero.
The spectrally narrowed SHG pulse spectrum is said to get apodized, because an impact of the elemental pulse exceeding the utmost input bandwidth limit will be the removing of the best and cheapest frequencies through the SHG pulse spectrum.
The angular written content of a centered beam is usually visualized by tracing rays from your lens into the focal spot. Every single ray drawn from the lens to a tightly targeted location (Determine 23) can make a distinct angle (ψ) with the Main ray, and the variety of angles improves Using the NA. Given that the number of angles boosts over and above the reference NA filter (or angular area apodization filter width), the phase-matching with the rays beyond the filter width diminishes consequently reducing the SHG conversion performance of All those rays.
The size with the SHG crystal drastically affects the spectral width in the reference pulse, or alternatively the bandwidth of the SHG filter.