Top a-BBO Crystal Secrets
Top a-BBO Crystal Secrets
Blog Article
The calculation previously mentioned assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform depth profiles and roughly estimate a optimum electricity density.
A1: Yes, BBO crystals Have got a high problems threshold, producing them well suited for substantial-electrical power laser systems. Their means to withstand superior laser intensities without the need of struggling from optical injury will make them a superb option for frequency conversion in significant-electric power lasers.
As a way to use the desired CW injury threshold of an optic, it is necessary to learn the next:
Having said that, it’s essential to Take note that though BBO crystals can tackle large ability, they should however be employed in their specified electricity range to circumvent probable harm and be certain optimum functionality.
Figure 23: This diagram illustrates a beam's focal region in the uniaxial birefringent substance. Straight lines, representing rays, are drawn in the Middle of your beam waistline. Since the beam diverges in the beam waist, the Vitality while in the beam is dispersed more than a bigger cross sectional region.
On the other hand, it’s vital that you Notice that though BBO crystals can transmit UV gentle, they ought to be taken care of with treatment when used in UV programs to forestall probable damage to the crystal and be certain protection.
The spatial stroll-off angle depends upon the dimensions of the beam as well as the crystal size. While the angle might be significant, it is normally smaller, usually within the buy of ten mrad, and may be neglected.
As illustrated in the following desk, the shorter the crystal, the wider the reference pulse spectrum. The desk under assumes a fundamental Heart wavelength inside the near-IR.
Pumped with the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength array in between 422nm and 477nm has become noticed by angle-tuning a sort I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields over 50µJ (utmost a hundred thirtyµJ),
It’s like using one Take note and splitting it into two harmonious tones. This method may be vital in several State-of-the-art optical experiments and systems.
As might be mentioned click here beneath, There exists a focusing numerical aperture (NA) limitation to your SHG stage-matching process particularly analogous towards the spectral section matching limitation talked about in the past section (
Future, the ability/Power is possibly improved or lessened along with the optic is uncovered at 10 new destinations. This process is recurring right up until harm is noticed. The problems threshold is then assigned to become the best energy/Electricity that the optic can face up to without leading to destruction. A histogram including that underneath represents the screening of 1 BB1-E02 mirror.
A advisable guideline for focusing femtosecond laser pulses right into a nonlinear crystal is to keep up a Rayleigh variety that is definitely at least quite a few moments for a longer time compared to the duration on the SHG crystal. This minimizes the prospect of harmful the crystal, as well as lessens the damaging effects of spatial period mismatch and spatial (Poynting vector) walk-off.
Generation of deep ultraviolet radiation at 210 nm by Sort-I third harmonic generation is accomplished inside a pair of BBO crystals with conversion efficiency as significant as 36%.