5 Simple Techniques For a-BBO Crystal

5 Simple Techniques For a-BBO Crystal

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β-BBO Crystal—a widely made use of nonlinear crystal for frequency conversion inside the ultraviolet, seen and in close proximity to-infrared

Any scratches can degrade the optical effectiveness with the crystal and likely result in problems under large laser ability. For stubborn stains, a solution of moderate detergent or isopropyl Alcoholic beverages is usually gently applied to the crystal surface area then rinsed off with distilled drinking water.

A: Indeed, BBO crystals show spectacular thermal steadiness, creating them suited to applications with varying temperatures.

Any contamination can degrade the optical effectiveness with the crystal and perhaps induce injury less than higher laser energy. When storing BBO crystals, they must be put in the protective case to prevent Actual physical problems and dirt accumulation.

Now Evaluate the most energy density to that which happens to be specified since the LIDT for the optic. In case the optic was examined in a wavelength other than your working wavelength, the problems threshold must be scaled properly.

Physically, when the fundamental spectrum is properly inside the reference pulse spectrum, the SHG pulse depth profile may be the sq. of the fundamental depth profile, efficiently truncating the length. This circumstance is illustrated in Figure twenty.

Some manufacturers' SHG crystals, like Thorlabs', present near-stage-matched situations for Commonly incident input light-weight for any specified elementary frequency. These brands polish website the faces of the SHG crystals this sort of the angle involving the Ordinarily incident light and the optic axis may be the section-matched angle for the required frequency.

When pulse lengths are between 1 ns and 1 µs, laser-induced injury can arise both thanks to absorption or perhaps a dielectric breakdown (as a result, a person should Examine equally CW and pulsed LIDT). Absorption is either because of an intrinsic home from the optic or as a result of surface area irregularities; Hence LIDT values are only valid for optics meeting or exceeding the surface top quality specs presented by a maker.

The stage velocity is the speed at which the sphere copyright, i.e. the sine wave, travels in a material. The rate at which a pulse envelope travels in a fabric is called the group velocity and defines the pace with the Power packet comprising the optical pulse traveling by means of the material.

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This high-quality-tuning capability means that BBO crystals can cater to both generic and very specialised wants with equal finesse.

A advised guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to take care of a Rayleigh selection that is at the least quite a few moments extended in comparison to the length on the SHG crystal. This minimizes the possibility of harmful the crystal, along with decreases the adverse results of spatial stage mismatch and spatial (Poynting vector) walk-off.

The difficulty that arises when working with ultrashort pulses for second harmonic era (SHG) is the fact that shorter pulses have larger sized bandwidths, but the ideal period-matched condition may be reached for only an individual essential wavelength at any given time. Resulting from this, the standard of the phase match could be appreciably even worse in direction of the spectral edges of wide-bandwidth pulses.