Typical cleaning and suitable storage will help increase the lifespan of BBO crystals. It’s also imperative that you avoid exposing the crystals to ailments outside their specified running assortment, as this can cause long-lasting hurt.
A1: Sure, BBO crystals Have a very higher hurt threshold, generating them well suited for higher-electricity laser methods. Their potential to resist high laser intensities without the need of struggling from optical injury will make them a superb option for frequency conversion in large-ability lasers.
Hi there, thanks for speaking to Thorlabs. The wavelength ranges in the antireflective coatings on these β-BBO crystals align With all the respective wavelength bands that these crystals are optimized for. Requests for customizations could be created by reaching out to us at [email protected]
In place of the reference pulse electrical power spectrum comprising an apodization filter, in the spatial area the filter could well be in NA. The angular area apodization filter having said that, is only in one-dimension defined because of the airplane k and .
We use Numerical Aperture (NA) to explain the extent of this angular written content. Ideally, the basic laser light-weight might be collimated through the entire crystal, because collimated light-weight resembles a bunch of rays aligned to the same direction with an NA of zero.
Even so, it’s vital that you note that even though BBO crystals can transmit UV light, they must be dealt with with care when Employed in UV applications to avoid probable harm to the crystal and make sure security.
Occasionally, the mismatch can be little. By way of example, every time a β-BBO crystal is accustomed to frequency double 1550 nm mild and supply 775 nm light-weight, the group velocity mismatch is only a few femtoseconds for every millimeter.
It is typically required to aim the incident mild from the crystal for SHG apps, because economical generation of 2nd harmonic mild involves superior peak intensities, for instance 109 W/cm2. When using femtosecond pulses with average energies while in the nanojoule range, acquiring the necessary peak intensities can need compact focal spots.
Considering that the refractive index isn't going to fluctuate linearly with frequency in dispersive crystals like β-BBO, it's not possible to optimally phase match every frequency in the enter pulse's spectral array with the corresponding next harmonic frequency during the produced pulse.
A5: Yes, BBO crystals have exceptional thermal steadiness and may manage their Qualities at place temperature. Therefore they can be Utilized in a variety of environments with out necessitating Unique temperature control.
As are going to be reviewed under, there is a concentrating numerical aperture (NA) limitation towards the SHG section-matching course of action specifically analogous on the spectral stage matching limitation discussed from the earlier section (
Beta Barium Borate here (BBO) crystals have taken the whole world of photonics by storm. One of the most impressive components of these crystals is their groundbreaking purpose in 266nm era.
Their supremacy On this domain is not only accidentally, but a result of their intrinsic and meticulously crafted Homes.
The issue that arises when making use of ultrashort pulses for 2nd harmonic era (SHG) is the fact shorter pulses have more substantial bandwidths, but The perfect period-matched ailment can be accomplished For less than an individual elementary wavelength at any given time. Resulting from this, the standard of the section match is often appreciably even worse toward the spectral edges of broad-bandwidth pulses.