BBO Crystal for Dummies
BBO Crystal for Dummies
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The difficulty that arises when working with ultrashort pulses for second harmonic technology (SHG) is that shorter pulses have bigger bandwidths, but the ideal stage-matched situation may be reached for only only one elementary wavelength at a time. Because of this, the standard of the period match can be significantly even worse to the spectral edges of wide-bandwidth pulses.
The Electricity in both of those waves propagates in Instructions determined by their Poynting vectors. Snell's legislation will not describe the way of Electricity move, nevertheless it can be utilized to determine the way with the k-vector while in the crystal.
BBO crystals may be purchased from various suppliers specializing in optical components. It’s crucial to go with a reliable provider to be certain the quality of the crystals.
For beams using a higher PRF both of those the normal and peak powers have to be in comparison to the equivalent CW ability. In addition, for very transparent resources, There is certainly minimal to no fall from the LIDT with increasing PRF.
Various elements can affect the overall performance of BBO crystals. These contain temperature, humidity, and the quality of the incident gentle. Good managing and storage can assist keep the crystal’s general performance. Temperature can have an affect on the period-matching ailments of BBO crystals, which in turn affects their effectiveness in frequency conversion applications.
A advisable guideline for concentrating femtosecond click here laser pulses right into a nonlinear crystal is to keep up a Rayleigh array that is no less than many occasions for a longer period as opposed to duration on the SHG crystal. This minimizes the prospect of detrimental the crystal, together with minimizes the destructive results of spatial stage mismatch and spatial (Poynting vector) wander-off.
Cleansing BBO crystals is a delicate method that requires treatment to stay away from detrimental the crystal’s area. A soft fabric or lens tissue moistened by using a moderate solvent, for example isopropyl alcohol, may be used to gently wipe the surface area from the crystal.
) to blow off dust and various loose contaminants to start with. If a dry nitrogen line is obtainable inside the lab, an air gun can be utilised to blow away dust particles. Blow from the floor gently. Tend not to blow from the crystal by itself from your hand!
The stage matching angle is often altered by rotating the crystal throughout the y axis. An adjustment that is typically within a few levels can either optimize the overall performance of the crystal within the setup or match A further fundamental frequency while in the crystal's running variety.
When evaluating an LIDT specified to get a pulsed laser on your laser, it is crucial to learn the following:
A variety of Qualities of the nonlinear crystal is often important for an software e.g. in nonlinear frequency conversion:
Along with their large destruction threshold, BBO crystals also show outstanding thermal and chemical stability. They're able to withstand a variety of temperatures and resist degradation from many chemical interactions.
The size from the SHG crystal considerably influences the spectral width of the reference pulse, or alternatively the bandwidth of the SHG filter.