The Definitive Guide to a-BBO Crystal
The Definitive Guide to a-BBO Crystal
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Within the intricate tapestry of photonics, the 266nm era, backed via the prowess of BBO, emerges to be a thread of paramount value.
Although this guideline offers a normal craze, It's not a quantitative Examination of LIDT vs wavelength. In CW applications, As an example, injury scales a lot more strongly with absorption inside the coating and substrate, which isn't going to always scale nicely with wavelength.
The phase matching angle is often modified by rotating the crystal round the y axis. An adjustment that is typically in just a couple of degrees can possibly enhance the performance from the crystal from the set up or match One more elementary frequency in the crystal's running array.
The Strength density of your beam needs to be calculated with regards to J/cm2. The graph to the appropriate exhibits why expressing the LIDT as an Electricity density gives the best metric for short pulse resources. With this routine, the LIDT specified being an Power density could be applied to any beam diameter; a person won't really need to compute an modified LIDT to regulate for changes in place dimension.
Even so, it’s crucial to Notice that even though BBO crystals can read more transmit UV mild, they should be taken care of with treatment when Utilized in UV apps to circumvent possible harm to the crystal and make certain protection.
Humidity can result in drinking water absorption to the crystal area, which may degrade its optical overall performance. The quality of the incident gentle, like its wavelength, intensity, and polarization, may also have an impact on the overall performance of BBO crystals in many applications.
When an optic is weakened by a continuous wave (CW) laser, it is often because of the melting in the area because of absorbing the laser's Vitality or damage to the optical coating (antireflection) [one]. Pulsed lasers with pulse lengths extended than 1 µs might be addressed as CW lasers for LIDT conversations.
Knowledge Crystal is akin to appreciating the bedrock of State-of-the-art optical technologies. At its essence, BBO, or Beta Barium Borate, stands as a nonlinear optical crystal. The phrase “nonlinear�?below signifies the special capacity on the crystal to communicate with light-weight in a very manner that alters the light’s frequency.
Consequently, the 2nd harmonic pulse spectrum, revealed on the best, includes a spectral width somewhere around the same as The best circumstance. Preferably, just about every frequency in the elemental pulse spectrum will be concurrently phase matched.
As are going to be discussed beneath, There's a concentrating numerical aperture (NA) limitation to your SHG phase-matching approach specifically analogous towards the spectral stage matching limitation talked about within the preceding section (
This fine-tuning capability signifies that BBO crystals can cater to equally generic and really specialised wants with equal finesse.
Even so, the nonlinear optical properties of the-BBO crystal is vanished as a result of centric symmetry with its crystal framework. It's not at all advisable to use for NLO procedures.
This has not simply expanded the capabilities of present systems but has also paved just how For brand spanking new improvements.