5 Simple Techniques For a-BBO Crystal
5 Simple Techniques For a-BBO Crystal
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The calculation previously mentioned assumes a uniform beam intensity profile. You need to now contemplate hotspots within the beam or other non-uniform depth profiles and approximately compute a greatest electrical power density.
β-BBO Crystal—a commonly used nonlinear crystal for frequency conversion during the ultraviolet, visible and in close proximity to-infrared
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A: Indeed, BBO crystals exhibit remarkable thermal security, creating them appropriate for applications with various temperatures.
The period-matching capabilities of BBO crystals ought to have Unique point out. In the intricate dance of photons, wherever conversion from just one wavelength to a different is frequently desired, the phase-matching provided by BBO makes certain that energy losses are small.
In the situation of Variety-I section matching and β-BBO crystals, the basic light-weight propagates as a unprecedented wave inside the crystal, when the second harmonic mild propagates as a standard wave.
The spatial wander-off angle will depend on the dimensions of your beam as well as the crystal size. Though the angle can be major, it is normally compact, normally on the get of 10 mrad, and may be neglected.
The angular articles of a concentrated beam is usually visualized by tracing rays with the lens to your focal place. Every ray drawn in the lens to the tightly focused location (Figure 23) would make a different angle (ψ) Using the Main ray, as well as range of angles boosts with the NA. Since the choice of angles increases past the reference NA filter (or angular domain apodization filter width), the phase-matching of your rays outside of the filter width diminishes as a result lowering the SHG conversion performance of These rays.
Comprehending Crystal is akin to appreciating the bedrock of Superior optical technological innovation. At its essence, BBO, or Beta Barium Borate, stands as a nonlinear optical crystal. The time period “nonlinear�?in this article signifies the exclusive potential from the crystal to interact with light in the manner that alters the light’s frequency.
The temporal walk-off in the slower pulse with respect to your a lot quicker can be a considerable portion of the heart beat period. That a-BBO Crystal is illustrated in Figure 22.
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This wonderful-tuning capability signifies that BBO crystals can cater to each generic and extremely specialized wants with equivalent finesse.
A suggested guideline for focusing femtosecond laser pulses right into a nonlinear crystal is to take care of a Rayleigh variety that is not less than many times longer than the length in the SHG crystal. This minimizes the prospect of damaging the crystal, in addition to lowers the unfavorable outcomes of spatial section mismatch and spatial (Poynting vector) wander-off.
The spectrally narrowed SHG pulse spectrum is said to be apodized, since an result of the basic pulse exceeding the maximum input bandwidth Restrict will be the elimination of the highest and least expensive frequencies in the SHG pulse spectrum.