The high injury threshold of BBO crystals is especially vital in environments where by large-depth lasers will be the norm. Classic supplies may well falter, degrade, or simply crack less than these kinds of intensities.
Even so, in several situations, the primary difference in the elemental and next harmonic pulse velocities may cause 1 pulse to drastically lag the opposite.
Hi, thank you for getting in touch with Thorlabs. The wavelength ranges of the antireflective coatings on these β-BBO crystals align with the respective wavelength bands that these crystals are optimized for. Requests for customizations could be created by reaching out to us at [email protected]
Nevertheless, to fully benefit from the prospective of BBO crystals, it is essential to be aware of their properties and how to tackle and shop them appropriately. These crystals demand mindful dealing with to stop harm to their surfaces and should be saved in the dry, great put to take care of their optical functionality.
The Strength density of the beam should be calculated in terms of J/cm2. The graph to the appropriate exhibits why expressing the LIDT being an Vitality density supplies the best metric for brief pulse resources. Within this routine, the LIDT supplied as an energy density is usually placed on any beam diameter; a person isn't going to have to compute an altered LIDT to regulate for changes in location sizing.
). This spatial focusing constraint on the SHG course of action will commonly cause the crystal length often becoming under the Rayleigh variety of the input focused pulse.
When the above mentioned method gives an excellent guideline for LIDT values, make sure you Make contact with Tech Assist If the wavelength is different from the specified LIDT wavelength. In the event your ability density is fewer than the altered LIDT with the optic, then the optic need to operate for the application.
The injury Assessment might be carried out on the same optic (customer's optic will not be ruined). Tests might end in additional charges or lead moments. Contact Tech Assist For more info.
Understanding Crystal is akin to appreciating the bedrock of Innovative optical technologies. At its essence, BBO, or Beta Barium Borate, stands website for a nonlinear optical crystal. The term “nonlinear�?right here signifies the unique potential of your crystal to interact with mild in a very manner that alters the light’s frequency.
The temporal wander-off from the slower pulse with respect for the speedier is usually a substantial fraction of the pulse length. This is certainly illustrated in Determine 22.
The team velocity plus the period velocity are usually not equivalent, meaning the sine wave of the provider and the envelope of the pulse move by optical media at distinctive speeds.
When selecting an SHG crystal, the heartbeat duration on the laser supply has to be taken into account. A mismatch in between the length and crystal thickness will result in SHG pulses more time in time and narrower in spectral information than achievable under excellent disorders.
A advised guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to maintain a Rayleigh variety that's at least several periods lengthier than the size of your SHG crystal. This minimizes the possibility of detrimental the crystal, in addition to reduces the destructive consequences of spatial period mismatch and spatial (Poynting vector) wander-off.
BBO’s versatility actually shines when just one considers the breadth of its purposes. It’s not merely confined to at least one specialized niche of photonics but stretches across a number of domains. Just take frequency doubling, For illustration. In this method, photons While using the same frequency combine within the crystal to produce new photons with double the frequency of the original.