a-BBO Crystal Secrets
a-BBO Crystal Secrets
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β-BBO Crystal—a commonly utilized nonlinear crystal for frequency conversion from the ultraviolet, visible and in the vicinity of-infrared
The position of the environmentally friendly curve depends on θ. In this instance, the angle θ has been tuned to offer a refractive index for 515 nm gentle that matches the refractive index for 1030 nm gentle. This tuning angle is consequently optimized for Kind-I SHG stage matching as well as a fundamental-frequency enter beam of 1030 nm.
This effectiveness is important, particularly when one particular considers the generation in the 266nm wavelength, wherever even insignificant inefficiencies can result in sizeable Electrical power losses.
The Electricity density of your beam must be calculated concerning J/cm2. The graph to the ideal displays why expressing the LIDT being an Power density gives the most effective metric for brief pulse resources. On this regime, the LIDT given as an Electricity density could be applied to any beam diameter; just one doesn't really need to compute an adjusted LIDT to adjust for modifications in location sizing.
Thorlabs expresses LIDT for CW lasers as being a linear ability density calculated in W/cm. In this regime, the LIDT specified for a linear power density may be placed on any beam diameter; a single does not ought to compute an adjusted LIDT to adjust for modifications in location dimension, as demonstrated with the graph to the appropriate. Regular linear ability density is often calculated using the equation underneath.
Period matching significantly improves the conversion effectiveness and may be needed to get enough frequency-doubled light for apps, but second harmonic era (SHG) will happen even if period matching is not really performed. The effect of phase matching around the output intensity of SHG gentle (I2ω) is illustrated in Figure 16.
Rather then decompose the SHG polarization into components Ex and Ez, the light is usually described as a rare wave (E'e) using a refractive index, n'e. In the diagram on the correct, n'e, which will depend on θ, is indicated through the intersection with the conic portion illustrated by the purple ellipse Using the XZ airplane.
Assuming a crystal of a supplied thickness, it is possible to outline a reference pulse that has a spectral vary that is definitely the utmost that may be adequately period matched. This spectral bandwidth limitation can even be considered with regard to an SHG spectral filter whose passband will depend on both equally the particular crystal and the heartbeat's Middle frequency. Frequencies outside of this filter’s passband will likely be turned down from going through the SHG system.
Hence, the 2nd harmonic pulse spectrum, revealed on the appropriate, has a spectral width somewhere around similar to The perfect situation. Ideally, every single frequency in the elemental pulse spectrum will be simultaneously section matched.
The group velocity and the phase velocity are not equal, this means the sine wave from the provider as well as the envelope of the heartbeat transfer by way of optical media at diverse speeds.
This characteristic interprets to lowered will need for comprehensive thermal management systems, all over again accentuating Price tag savings and system simplicity.
The 266nm generation refers back to the manufacture of ultraviolet light that has a wavelength of 266 nanometers.
And finally, spectroscopy, the research of interactions amongst make a difference and electromagnetic radiation, greatly Gains from the 266nm technology. In spectroscopic programs, various wavelengths of light interact in another way with components, supplying website a spectrum that may be analyzed to determine the material’s properties or composition.