Detailed Notes on BBO Crystal
Detailed Notes on BBO Crystal
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Equally broad-bandwidth pulses and temporal wander-off bring about a reduction in the conversion performance, and worsen the optical top quality of the 2nd harmonic pulses. The suitable crystal thickness needs to be picked out to reduce both equally results.
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These properties make BBO crystals highly desirable in several applications, from laser frequency conversion to electro-optic modulation. Their broad transparency variety permits them to operate using a wide variety of laser wavelengths, while their high destruction threshold ensures they're able to handle high-power laser beams devoid of degradation.
Thorlabs expresses LIDT for CW lasers being a linear electricity density calculated in W/cm. With this routine, the LIDT supplied as being a linear energy density is usually placed on any beam diameter; a single will not should compute an modified LIDT to adjust for changes in location measurement, as demonstrated through the graph to the proper. Regular linear power density is often calculated utilizing the equation beneath.
linear absorption, which can trigger heating at significant optical power concentrations, so the stage matching is disturbed, and thermal lensing may perhaps happen
Stage matching drastically enhances the conversion effectiveness and might be necessary to attain sufficient frequency-doubled gentle for apps, but second harmonic generation (SHG) will occur regardless of whether section matching isn't executed. The influence of stage get more info matching to the output intensity of SHG mild (I2ω) is illustrated in Figure sixteen.
The Rayleigh variety quantifies the gap, calculated from your beam waist, over which the beam diameter is approximately consistent. The shorter the Rayleigh range, the bigger the rate of divergence.
A 2nd issue would be that the team velocity mismatch between the 2nd harmonic and fundamental-frequency pulses will cause one pulse lagging the opposite as The 2 propagate. This is called temporal wander-off and may happen even underneath best phase-matched conditions.
The lifespan of BBO crystals could vary drastically determined by various elements. These contain how the crystals are utilized, how They're managed, as well as situations in which They may be stored.
BBO crystals are also Utilized in electro-optic modulation, a technique used to regulate the phase, polarization, or amplitude of a light-weight beam. Furthermore, they discover use in optical parametric oscillation, a approach that generates two output waves from a person input wave, and quantum optics, a field that explores the quantum interactions of light and make any difference.
This house sets it apart from linear optical supplies that don’t alter the frequency of sunshine passing through them. Such a distinguishing feature types the foundation for the myriad of apps that BBO can serve.
In frequency conversion, BBO crystals are accustomed to change the shade of laser mild, enabling the creation of a wide array of colors that are not immediately accessible from obtainable laser sources. In electro-optic modulation, These are utilised to control the depth, phase, polarization, or path of a laser beam.
Consequently, the next harmonic pulse spectrum, demonstrated on the proper, features a spectral width around the same as the ideal scenario. Ideally, each frequency in the elemental pulse spectrum can be simultaneously phase matched.
Since the refractive index would not differ linearly with frequency in dispersive crystals like β-BBO, it can be not possible to optimally phase match every frequency from the input pulse's spectral vary Along with the corresponding second harmonic frequency from the created pulse.