The calculation previously mentioned assumes a uniform beam intensity profile. You need to now take into account hotspots inside the beam or other non-uniform depth profiles and around determine a highest electrical power density.
Beta Barium Borate (BBO) crystals happen to be a subject of interest in the sphere of optics and photonics because of their unique properties. In this post, we goal to answer ten common questions about BBO crystals, offering a comprehensive comprehension of this fascinating substance.
Any scratches can degrade the optical functionality from the crystal and likely cause damage beneath substantial laser electrical power. For stubborn stains, an answer of delicate detergent or isopropyl Alcoholic beverages is often gently applied to the crystal surface after which rinsed off with distilled water.
On the other hand, to fully make the most of the possible of BBO crystals, it's crucial to grasp their properties and how to manage and retail outlet them properly. These crystals require watchful dealing with to prevent damage to their surfaces and will be stored inside of a dry, amazing area to take care of their optical efficiency.
The Vitality density of one's beam needs to be calculated when it comes to J/cm2. The graph to the right shows why expressing the LIDT as an Power density offers the most beneficial metric for short pulse resources. Within this regime, the LIDT supplied being an Strength density can be placed on any beam diameter; 1 won't need to compute an adjusted LIDT to adjust for variations in place dimensions.
As the next harmonic mild propagates, its energy flows in another direction than that of the fundamental gentle.
The second harmonic frequency wave is created as an extraordinary wave, that's polarized orthogonal to the fundamental-frequency common wave.
The angular written content of the focused beam is often visualized by tracing rays within the lens towards the focal place. Every ray drawn within the lens to your tightly centered location (Determine 23) will make another angle (ψ) Using the chief ray, as well as the variety of angles boosts Along with the NA. As being the variety of angles increases over and above the reference NA filter (or more info angular area apodization filter width), the period-matching with the rays beyond the filter width diminishes therefore lowering the SHG conversion effectiveness of Individuals rays.
Now Examine the maximum energy density to that and that is specified as being the LIDT for your optic. When the optic was analyzed at a wavelength other than your functioning wavelength, the hurt threshold should be scaled properly [3].
With proper care and dealing with, BBO crystals can very last for quite some time. Even so, their lifespan could be shortened by things for example higher temperature, humidity, and Bodily problems. BBO crystals are robust and sturdy, but Like every optical component, they will degrade after a while Otherwise thoroughly cared for.
The elemental resource is the dye laser radiation pumped by the second harmonic of the Q-switched Nd: YAG laser. A wander-off compensated configuration Using the BBO crystal pair has enabled us to comprehend such a large conversion effectiveness while in the interaction.
When picking an SHG crystal, the pulse duration on the laser supply needs to be taken into consideration. A mismatch in between the duration and crystal thickness will cause SHG pulses for a longer period in time and narrower in spectral content than feasible below great problems.
Having said that, the nonlinear optical Attributes of the-BBO crystal is vanished due to the centric symmetry with its crystal composition. It is far from advised to work with for NLO procedures.
This has don't just expanded the capabilities of current systems but has also paved just how For brand spanking new innovations.