Standard cleansing and proper storage can help increase the lifespan of BBO crystals. It’s also vital that you stay clear of exposing the crystals to circumstances exterior their specified operating assortment, as this could cause lasting injury.
During the sophisticated tapestry of photonics, the 266nm era, backed from the prowess of BBO, emerges like a thread of paramount significance.
So that you can use the desired CW destruction threshold of the optic, it is necessary to understand the following:
A: A superior problems threshold ensures the crystal can cope with additional electrical power devoid of degrading, leading to for a longer period lifespan and dependable overall performance.
From a ray-model viewpoint, the propagation route defines the orientation with the central (Main) ray in Figure 23. The SHG process is affected via the selection of angles more than which incident gentle propagates, simply because gentle that isn't parallel into the Main ray has lessened phase-matching relative to your chief ray.
The 4 lessen figures illustrate that the group velocity delay (temporal stroll-off) will increase since the pulses propagate as a result of the material. The temporal wander-off is illustrated for distances Z0 as a result of Z3, that happen to be indicated on the diagram at leading.
The second harmonic frequency wave is created as a rare wave, and that is polarized orthogonal to the basic-frequency common wave.
The physical, chemical, optical, and thermal Houses from the α -BBO are much like All those of your BBO crystals, though the α -BBO does not exhibit the nonlinear optical Qualities due to the central symmetry of its crystal construction.
Pumped from the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength array involving 422nm and 477nm has been observed by angle-tuning a kind I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields more than 50µJ (highest one hundred thirtyµJ),
The temporal walk-off from the slower pulse with respect for the more rapidly is usually a considerable portion of the heartbeat length. This really is illustrated in Figure 22.
The elemental source may be the dye laser radiation pumped by the second harmonic of a Q-switched Nd: YAG laser. A walk-off compensated configuration Along with the BBO crystal pair has enabled us to comprehend this type of large conversion performance from the interaction.
The angular content on the resultant SHG pulse, or beam, within the dimension with the angular filter is decreased from a super situation. From the perpendicular dimension, the SHG beam preserves the angular content material with the input beam, considering that there’s no angular filter in that dimension. A diverging beam with asymmetric NA’s, i.e. in the horizontal and vertical dimensions, causes an elliptical more info beam.
Nevertheless, the nonlinear optical properties of the-BBO crystal is vanished due to the centric symmetry with its crystal structure. It is not recommended to use for NLO procedures.
Technology of deep ultraviolet radiation at 210 nm by Form-I 3rd harmonic era is reached in the pair of BBO crystals with conversion efficiency as higher as 36%.