The Single Best Strategy To Use For a-BBO Crystal
The Single Best Strategy To Use For a-BBO Crystal
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The calculation previously mentioned assumes a uniform beam depth profile. You have to now consider hotspots during the beam or other non-uniform intensity profiles and around compute a maximum ability density.
The team velocities of the basic and next harmonic pulses also are diverse, even when period-matched, and also the magnitude in the team velocity mismatch is dependent upon the crystal Qualities plus the optical frequencies within the pulses.
In an effort to use the desired CW injury threshold of an optic, it's important to grasp the subsequent:
In quasi-phase matching, the crystal content is “poled�?to possess up and down domains to counteract the section-mismatch of the material, the place the poling time period is precise to your wavelengths of interaction.
Any contamination can degrade the optical overall performance of the crystal and likely induce harm underneath higher laser ability. When storing BBO crystals, they ought to be placed in the protective circumstance to forestall physical problems and dirt accumulation.
The effectiveness on the SHG system decreases substantially as the elemental beam diverges from its focus, Because the pulse Strength is distributed across a bigger beam cross part.
When the above mentioned technique supplies a superb guideline for LIDT values, remember to Speak to Tech Aid In the event your wavelength differs from the desired LIDT wavelength. When your electricity density is below the altered LIDT in the optic, then the optic must function for your application.
These Qualities make BBO crystals highly appealing in many programs, from laser frequency conversion to electro-optic modulation. Their large transparency variety will allow them to work that has a broad range of laser wavelengths, although their large more info hurt threshold makes sure they are able to manage substantial-electrical power laser beams with no degradation.
Taken together, these various programs underscore the enormous value BBO crystals deliver to several sectors. Via its unparalleled 266nm technology, the BBO crystal is not merely a Software but a catalyst, propelling developments across different fields.
For that reason, the second harmonic pulse spectrum, revealed on the correct, has a spectral width somewhere around the same as The best situation. Preferably, just about every frequency in the fundamental pulse spectrum could well be concurrently section matched.
Thorlabs offers a large choice of optics optimized for use with femtosecond and picosecond laser pulses. Make sure you see beneath To find out more.
Subsequent, the facility/Power is possibly improved or lessened as well as the optic is exposed at 10 new locations. This process is recurring till problems is observed. The hurt threshold is then assigned to generally be the highest electric power/Power the optic can endure with out resulting in damage. A histogram which include that beneath signifies the tests of one BB1-E02 mirror.
The second harmonic light-weight is then polarized parallel on the plane. Angle tuning adjusts θ and is particularly done by rotating the crystal across the Y-axis.
The difficulty that arises when employing ultrashort pulses for next harmonic technology (SHG) is always that shorter pulses have larger sized bandwidths, but The best period-matched ailment could be realized For under only one essential wavelength at any given time. Due to this, the standard of the period match might be drastically worse towards the spectral edges of wide-bandwidth pulses.