a-BBO Crystal Fundamentals Explained
a-BBO Crystal Fundamentals Explained
Blog Article
Higher-precision laser microfabrication is a technique in which elements are processed and modified with a microscopic scale. This process requires a laser supply which can deliver extremely concentrated and precise beams of light. The 266nm wavelength is especially appropriate for this as a consequence of its brief wavelength, which makes sure that the laser beam is often targeted to an extremely modest place dimensions.
However, it may be very hard to compare the LIDT specification of the optic for your laser. You will find numerous regimes during which a pulsed laser can damage an optic and this is based over the laser's pulse duration. The highlighted columns during the table under define the applicable pulse lengths for our specified LIDT values.
In order to use the required CW injury threshold of an optic, it is necessary to know the subsequent:
Having said that, to totally employ the probable of BBO crystals, it can be very important to understand their Homes and the way to cope with and keep them correctly. These crystals have to have careful managing to avoid harm to their surfaces and may be stored within a dry, great area to keep up their optical general performance.
Any contamination can degrade the optical functionality in the crystal and likely lead to destruction below significant laser electric power. When storing BBO crystals, they need to be put in the protecting scenario to prevent physical destruction and dirt accumulation.
They even have a large injury threshold, permitting them to manage significant-electrical power laser beams without having degradation. These special Qualities make BBO crystals a flexible Device in numerous optical purposes.
While the exam effects are only consultant of one coating operate, Thorlabs get more info specifies problems threshold values that account for coating variances.
a-BBO crystals by using a wedge angle (α) may be personalized fabricated with the specified orientation of the optical axis. A paired or this kind of prisms Along with the optical axes orthogonal to one another can be employed to repeatedly change the stage shift or time hold off amongst two orthogonally polarized pulses.
BBO crystals can be purchased from different suppliers specializing in optical supplies. It’s important to decide on a dependable supplier to ensure the standard of the crystals.
On top of that, spectroscopy, a way that’s fundamental in analyzing and comprehension the Houses of varied substances, reaps the rewards of BBO’s capabilities. Spectroscopy depends over the conversation amongst gentle and issue to derive insights about a compound’s composition, composition, and other properties.
Each broad-bandwidth pulses and temporal stroll-off induce a reduction inside the conversion performance, as well as worsen the optical top quality of the 2nd harmonic pulses. The right crystal thickness ought to be decided on to reduce both of those consequences.
Custom coatings could be applied to the crystal surfaces to enhance their efficiency at distinct wavelengths or to guard the crystal from environmental variables. Even so, it’s essential to Observe that any customization really should be finished diligently to stay away from degrading the crystal’s optical Houses.
The length on the crystal is a crucial parameter to think about when optimizing the SHG approach for that parameters of particular input pulses. Absent stage-matching and temporal walk-off results, the SHG output boosts exponentially with crystal duration. The intention when picking an SHG crystal is always to stability the crystal size with the constraints based on the basic pulse. Lowering the crystal thickness lowers consequences linked to the two phase-matching bandwidth limitations and temporal walk-off, which are specifically relevant.
The spectrally narrowed SHG pulse spectrum is claimed to get apodized, due to the fact an influence of the fundamental pulse exceeding the utmost enter bandwidth Restrict could be the removing of the highest and most affordable frequencies through the SHG pulse spectrum.