Equally broad-bandwidth pulses and temporal wander-off trigger a reduction while in the conversion efficiency, and worsen the optical quality of the 2nd harmonic pulses. The appropriate crystal thickness really should be preferred to reduce both equally outcomes.
g. in the shape of “gray tracking�? These types of phenomena are specifically typical for Procedure with ultraviolet mild. Take note that a gradual degradation may also guide into fast catastrophic hurt by way of extreme warmth generation.
Thorlabs provides a big variety of optics optimized for use with femtosecond and picosecond laser pulses. You should see below For more info.
BBO crystal stays the most versatile nonlinear optical crystals because of its one of a kind mixture of optical Homes (
The seed crystal is a bit BBO crystal with a definite positioning together amongst its principal axes. The seed crystal is affixed into a turning rod that dips to the thaw surface area.
A typical technique for obtaining ultrathin crystals is always to very first optically contact a thicker nonlinear crystal with some substrate (e.g. of fused silica) and afterwards to shine the crystal all the way down to the essential thickness of e.
When laser light-weight is concentrated to the spot, the diameter from the beam waist is the focal place dimension, and the rate at which the light diverges from your beam midsection is connected to the Rayleigh range (zR).
Supplied these applications, it’s evident why BBO, with its inherent capability to proficiently make the 266nm wavelength, is so remarkably prized. The crystal’s one of a kind nonlinear optical Houses enable the conversion of other wavelengths in to the coveted 266nm light-weight, making certain that scientists and industries have usage of this important tool.
For client usefulness the crystals could check here be mounted in an one" anodized aluminum (Al) mount. The mounted crystals may be even more mounted in a conventional 1" mirror mount being angle tuned for phase matching (as revealed to the correct). Water-cooled mounts for top electrical power applications is usually available on request.
BBO crystals may be bought from a number of suppliers around the world. When selecting a provider, it’s essential to look at elements for example the standard of the crystals, the supplier’s status, and the extent of customer service offered.
The raw elements, ordinarily a combination of barium carbonate and boric acid, are positioned inside a platinum crucible and heated until finally they melt. The temperature is then gradually lessened, allowing for the BBO crystal to variety about numerous months. The crystal is then extracted, cut into the desired form, and polished to obtain a significant-excellent optical surface area.
While the check benefits are only agent of one coating operate, Thorlabs specifies problems threshold values that account for coating variances.
BBO crystals also have a significant problems threshold, indicating they're able to withstand significant levels of laser energy devoid of struggling damage. This is particularly vital in applications involving significant-power lasers. Also, BBO crystals Use a superior nonlinear coefficient, which allows efficient frequency conversion, a critical purpose in lots of optical systems.
Last but not least, the cut crystals are polished to some sleek complete. This sharpening system not simply boosts the aesthetic visual appearance in the crystals and also increases their optical properties by reducing floor imperfections.