a-BBO Crystal Fundamentals Explained
a-BBO Crystal Fundamentals Explained
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The calculation above assumes a uniform beam depth profile. You should now consider hotspots within the beam or other non-uniform depth profiles and around determine a maximum electrical power density.
Having said that, in lots of instances, the real difference in the fundamental and second harmonic pulse velocities may cause just one pulse to noticeably lag the opposite.
An additional equally intriguing software is optical parametric oscillation. In this, BBO permits the conversion of the photon into two photons with diverse frequencies, the sum of which equals the initial photon’s frequency.
This improvement in clarity may lead to early prognosis and well timed intervention, most likely conserving life and improving upon individual outcomes.
Figure 23: This diagram illustrates a beam's focal location within a uniaxial birefringent substance. Straight lines, symbolizing rays, are drawn in the center in the beam waistline. As the beam diverges from your beam waistline, the Electricity during the beam is distributed in excess of a bigger cross sectional region.
Adverse uniaxial α-BBO crystal is an excellent birefringent crystal, suited to the manufacture of polarizer, polarization beam displacer, time delay compensator plate as well as other birefringent machine, especially for UV and high electric power laser.
Whilst the above technique delivers a good general guideline for LIDT values, make sure you Speak to Tech Guidance In the event your wavelength differs from the desired LIDT wavelength. When your electricity density is lower than the adjusted LIDT of the optic, then the optic should perform to your application.
As illustrated in the following table, the shorter the crystal, the broader the reference pulse spectrum. The table below assumes a essential Middle wavelength in the in close proximity to-IR.
When pulse lengths are involving one ns and one µs, laser-induced destruction can occur either due to absorption or perhaps a dielectric breakdown (as a result, a person must Verify equally CW and pulsed LIDT). Absorption is both resulting from an intrinsic assets of the optic or because of surface area irregularities; Hence LIDT values are only valid for optics Assembly or exceeding the surface quality technical specs specified by a maker.
A5: Of course, BBO crystals have excellent thermal balance and might manage their Qualities at area temperature. Therefore they can be used in an array of environments devoid of website demanding special temperature Manage.
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For beams that has a high PRF both of those the standard and peak powers have to be as compared to the equivalent CW energy. On top of that, for remarkably transparent supplies, There is certainly minor to no fall during the LIDT with escalating PRF.
The temporal walk-off is commonly considered severe in the event the temporal lag exceeds the period of the elemental pulse. Critical stroll-off may end up in temporal lag that irreparably boosts the period of your output next harmonic pulse.
The problem that occurs when working with ultrashort pulses for next harmonic technology (SHG) is usually that shorter pulses have larger bandwidths, but the ideal phase-matched situation could be attained For less than an individual basic wavelength at a time. On account of this, the caliber of the stage match could be substantially worse in the direction of the spectral edges of broad-bandwidth pulses.