Non-linear Optical (NLO) crystals supply an enormously flexible Answer for creating new wavelengths from current, off-the-shelf laser sources. The optical wavelength spectrum is utilized by a considerable and frequently growing number of purposes, from production of health-related lasers, quantum networking & computing via to environmental sensing along with many others.
BBO is the sole NLO content which can be made use of to provide the fifth harmonic technology (5HG) of Nd:YAG lasers at 213 nm. As a result of a little acceptance angle and large angular walkoff, fantastic laser beam good quality (modest divergence, fantastic method condition, and many others.
Once the Rayleigh selection is fewer than the crystal thickness, the distance more than which the beam is optimally rigorous is less than the crystal thickness.
The Z-axis is parallel towards the optical axis with the crystal and is additionally called the terrific axis. The X- and Y-axes are parallel for the optical axis and they are termed regular axes.
BBO is of particular relevance during the visible and far UV. Lots of period-matching applications are probable, such as the following:
They show excellent homogeneity about big volumes and have a substantial destruction threshold, but are hygroscopic and have a very low nonlinearity.
A recommended guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to keep up a Rayleigh vary that is certainly a minimum of a number of occasions extended compared to the length from the SHG crystal. This minimizes the prospect of damaging the crystal, and also cuts down the damaging results of spatial period mismatch and spatial (Poynting vector) wander-off.
A 2nd issue would be that the group velocity mismatch among the 2nd harmonic and elementary-frequency pulses will cause 1 pulse lagging the other as The 2 propagate. This is referred to as temporal walk-off and may arise even below ideal phase-matched conditions.
These processes include blending 2 or more input beams of light with various frequencies to provide a consequence beam with a new frequency.
Other phase matching ailments are probable. Essential Style-II stage matching makes use of an oe-o or eo-e for positive and unfavorable uniaxial crystals. Non-critical stage matching makes use of crystal temperature to accomplish phase matching as an alternative to angular tuning.
BBO crystals are renowned for his or her Outstanding optical properties. Their broad transparency selection makes it possible for them to operate effectively throughout a broad spectrum, from ultraviolet to in close proximity to-infrared gentle. This helps make them extremely flexible and well suited for many different purposes.
The spectrally narrowed SHG pulse spectrum is claimed to generally be apodized, considering the fact that an effect of the fundamental pulse exceeding the utmost enter bandwidth limit may be the elimination of the best and least expensive frequencies BBO Crystal from your SHG pulse spectrum.
BBO crystals also have a superior injury threshold, indicating they're able to endure high levels of laser electricity devoid of struggling problems. This is especially crucial in purposes involving high-electricity lasers. In addition, BBO crystals Have a very substantial nonlinear coefficient, which permits effective frequency conversion, a essential purpose in several optical units.
This would make them highly strong and resilient, even further enhancing their suitability for demanding optical purposes.