An Unbiased View of a-BBO Crystal
An Unbiased View of a-BBO Crystal
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The two frequencies' stage velocities are equal once they hold the exact same refractive index. The refractive indices for these two frequencies are normally not equal, since all media apart from vacuum are dispersive. Which means that a cloth's refractive index is determined by The sunshine's frequency.
Hello, thanks for speaking to Thorlabs. The wavelength ranges of your antireflective coatings on these β-BBO crystals align Using the respective wavelength bands that these crystals are optimized for. Requests for customizations may be created by reaching out to us at techsupport@thorlabs.com
The period matching angle may be modified by rotating the crystal around the y axis. An adjustment that is often inside of a couple of levels can either optimize the efficiency of your crystal during the set up or match Yet another basic frequency within the crystal's working range.
The energy density of your respective beam needs to be calculated when it comes to J/cm2. The graph to the right reveals why expressing the LIDT being an Vitality density delivers the top metric for brief pulse sources. In this particular regime, the LIDT supplied being an Strength density might be placed on any beam diameter; just one does not have to compute an altered LIDT to regulate for changes in location dimensions.
Offered these applications, it’s evident why BBO, with its inherent ability to efficiently create the 266nm wavelength, is so remarkably prized. The crystal’s one of a kind nonlinear optical properties allow the conversion of other wavelengths in to the coveted 266nm mild, making sure read more that researchers and industries have use of this important Software.
Delving deeper into the prowess of BBO crystals, it’s apparent that they depict the forefront of modern photonics. Their wide transparency array not simply bestows them with versatility but additionally ensures that they're compatible with varied light sources.
Some manufacturers' SHG crystals, such as Thorlabs', present close to-section-matched problems for normally incident input light for just a specified essential frequency. These manufacturers polish the faces from the SHG crystals these which the angle between the normally incident light and the optic axis will be the period-matched angle for the required frequency.
Pumped through the fourth harmonic of the Nd:YAG laser (at 266nm), a tunable OPO with sign wavelength range amongst 422nm and 477nm continues to be noticed by angle-tuning a type I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields greater than fiftyµJ (maximum 130µJ),
Therefore, the 2nd harmonic pulse spectrum, demonstrated on the right, includes a spectral width roughly similar to The perfect situation. Preferably, each individual frequency in the elemental pulse spectrum could well be concurrently phase matched.
The Uncooked elements, generally a mix of barium carbonate and boric acid, are placed in a platinum crucible and heated till they soften. The temperature is then little by little minimized, making it possible for the BBO crystal to kind more than several months. The crystal is then extracted, Lower into the desired form, and polished to obtain a large-good quality optical surface area.
When evaluating an LIDT specified for just a pulsed laser towards your laser, it is essential to understand the next:
When an enter pulse's spectral range is equivalent to or narrower compared to the reference pulse, the created next harmonic pulse has a period that's shorter by a factor of one/√two in addition to a spectral width that may be broader by an element of √2.
This article dives deep into the advantages and unique Attributes of BBO crystal and its paramount relevance in successful frequency doubling and harmonics generation at 266nm.