The 2-Minute Rule for a-BBO Crystal
The 2-Minute Rule for a-BBO Crystal
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The calculation previously mentioned assumes a uniform beam depth profile. You need to now take into account hotspots while in the beam or other non-uniform depth profiles and roughly work out a optimum electricity density.
From the advanced tapestry of photonics, the 266nm generation, backed through the prowess of BBO, emerges being a thread of paramount relevance.
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This enhancement in clarity can result in early analysis and well timed intervention, most likely preserving lives and strengthening client outcomes.
The energy density of your respective beam really should be calculated regarding J/cm2. The graph to the ideal shows why expressing the LIDT as an Electrical power density delivers the ideal metric for short pulse resources. With this regime, the LIDT supplied being an Power density may be applied to any beam diameter; a person will not should compute an modified LIDT to regulate for modifications in place sizing.
The four reduce figures illustrate which the team velocity hold off (temporal walk-off) boosts because the pulses propagate via the fabric. The temporal wander-off is illustrated for distances Z0 by way of Z3, which can be indicated over the diagram at top rated.
Their superior harm threshold and outstanding thermal balance make them well suited for use in high-electric power laser devices, whilst their extensive transparency selection enables them to work which has a broad selection of laser wavelengths.
It is typically necessary to concentration the incident light-weight within the crystal for SHG apps, because economical generation of second harmonic light involves substantial peak intensities, including 109 W/cm2. When working with femtosecond pulses with reasonable energies inside the nanojoule array, obtaining the expected peak intensities can have to have small focal places.
Considering that the refractive index would not fluctuate linearly with frequency in dispersive crystals like β-BBO, it's impossible to optimally section match each and every frequency within the enter pulse's spectral range While using the corresponding next harmonic frequency during the created pulse.
Hence, the next harmonic pulse spectrum, proven on the right, has a spectral width somewhere around similar to The best case. Ideally, each individual frequency in the basic pulse spectrum can be at the same time period matched.
As will likely be discussed underneath, There exists a concentrating numerical aperture (NA) a-BBO Crystal limitation for the SHG phase-matching course of action exactly analogous to the spectral period matching limitation talked about while in the former segment (
Considering that the dynamics of this process are hugely subject to experimental parameters, it's tricky to arbitrarily predict the specific results on the next harmonic pulse. These outcomes can include back again conversion, through which next harmonic gentle is transformed again to fundamental gentle, and spectral narrowing of your SHG pulse.
The temporal stroll-off is often regarded severe once the temporal lag exceeds the length of the elemental pulse. Serious walk-off may end up in temporal lag that irreparably increases the length of your output 2nd harmonic pulse.
This post dives deep into the benefits and distinctive Attributes of BBO crystal and its paramount importance in economical frequency doubling and harmonics generation at 266nm.