The Definitive Guide to a-BBO Crystal
The Definitive Guide to a-BBO Crystal
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The crystal axis is c. The chief ray is parallel for the course utilized to measure the tuning angle (θ), which is optimized during period matching. Conversion performance is optimized for rays parallel into the Main ray and even worse for rays at larger sized angles (ψ) to the chief ray.
The 266nm wavelength features specific interactions that other wavelengths can’t, rendering it indispensable for detecting and studying particular compounds.
While this guideline presents a general craze, It's not at all a quantitative Investigation of LIDT vs wavelength. In CW applications, As an example, destruction scales more strongly with absorption from the coating and substrate, which doesn't necessarily scale nicely with wavelength.
The period matching angle may be adjusted by rotating the crystal across the y axis. An adjustment that is typically in a number of degrees can both improve the general performance from the crystal from the set up or match A further essential frequency during the crystal's running range.
Numerous factors can have an impact on the functionality of BBO crystals. These incorporate temperature, humidity, and the standard of the incident light-weight. Suitable handling and storage can assist manage the crystal’s functionality. Temperature can have an affect on the phase-matching circumstances of BBO crystals, which in turn has an effect on their performance in frequency conversion apps.
Now compare the utmost power density to that which can be specified as the LIDT to the optic. In case the optic was analyzed at a wavelength aside from your operating wavelength, the damage threshold need to be scaled correctly.
Determine fourteen reveals a departure from a great polarization orientation for Variety-I SHG, exactly where the incident basic field includes a linear polarization but is rotated by a degree γ from your principal normal axis .
It is usually essential to concentrate the incident light during the crystal for SHG apps, given that effective era of second harmonic light requires high peak intensities, like 109 W/cm2. When utilizing femtosecond pulses with average energies from the nanojoule selection, obtaining the demanded peak intensities can demand smaller focal spots.
By way of example, take click here into account a essential pulse propagating more than a presented crystal thickness. If the temporal wander-off is bigger than the duration of the basic pulse, this pulse will also have a spectral bandwidth that significantly exceeds the spectral width of the reference pulse. A typical rule for limiting the harmful effects related to both Actual physical results is to decide on a crystal thickness that restrictions the fundamental and second harmonic temporal stroll-off to not more than the period of the fundamental pulse.
Hello, I had been thinking if It is really possible to suit your needs to produce a BBO crystal by using a custom made coating at 532nm fundamental and 266nm 2nd harmonic era. Very best, Ben
A: The broad transparency array features flexibility, allowing for BBO crystals for use throughout a various number of wavelengths and apps.
When evaluating an LIDT specified for the pulsed laser for your laser, it is crucial to know the subsequent:
The size with the crystal is an important parameter to consider when optimizing the SHG approach for that parameters of particular input pulses. Absent stage-matching and temporal stroll-off outcomes, the SHG output improves exponentially with crystal duration. The goal when choosing an SHG crystal is usually to harmony the crystal duration with the restrictions based on the elemental pulse. Lowering the crystal thickness reduces effects connected to the two section-matching bandwidth limitations and temporal walk-off, which can be right linked.
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