a-BBO Crystal Things To Know Before You Buy
a-BBO Crystal Things To Know Before You Buy
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The crystal axis is c. The chief ray is parallel for the direction utilized to evaluate the tuning angle (θ), that is optimized through section matching. Conversion efficiency is optimized for rays parallel to your Main ray and worse for rays at larger angles (ψ) on the Main ray.
The group velocities of the fundamental and next harmonic pulses can also be different, even when section-matched, and the magnitude in the group velocity mismatch depends on the crystal properties as well as optical frequencies while in the pulses.
Hello, thank you for getting in touch with Thorlabs. The wavelength ranges on the antireflective coatings on these β-BBO crystals align Along with the respective wavelength bands that these crystals are optimized for. Requests for customizations may be made by reaching out to us at techsupport@thorlabs.com
Even so, to totally make use of the prospective of BBO crystals, it really is essential to be aware of their Houses and how to cope with and store them thoroughly. These crystals need thorough managing to forestall harm to their surfaces and should be stored within a dry, great spot to maintain their optical effectiveness.
Any contamination can degrade the optical general performance of your crystal and likely bring about harm under substantial laser electricity. When storing BBO crystals, they need to be positioned inside a protective scenario to stop Actual physical injury and dirt accumulation.
Thorlabs expresses LIDT for CW lasers being a linear power density calculated in W/cm. In this regime, the LIDT offered to be a linear power density could be placed on any beam diameter; a single doesn't ought to compute an altered LIDT to regulate for improvements in place dimension, as demonstrated because of the graph to the best. Normal linear electricity density is often calculated using the equation here under.
The next harmonic frequency wave is created as a rare wave, that's polarized orthogonal to the basic-frequency ordinary wave.
When an optic is weakened by a constant wave (CW) laser, it is normally because of the melting in the floor due to absorbing the laser's Electricity or harm to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths more time than one µs can be dealt with as CW lasers for LIDT conversations.
This residence sets it aside from linear optical elements that don’t alter the frequency of light passing by way of them. This kind of distinguishing function kinds the foundation for any myriad of programs that BBO can provide.
The period velocity is the rate at which the sector provider, i.e. the sine wave, travels in a fabric. The rate at which a pulse envelope travels in a material is called the group velocity and defines the pace in the Electricity packet comprising the optical pulse touring via the material.
The team velocity and also the period velocity aren't equal, this means the sine wave of the copyright as well as envelope of the heart beat move by way of optical media at distinctive speeds.
Future, the facility/Power is both improved or lowered along with the optic is uncovered at 10 new destinations. This process is recurring right until injury is noticed. The injury threshold is then assigned to be the very best power/Electricity that the optic can face up to without resulting in damage. A histogram for example that below represents the tests of 1 BB1-E02 mirror.
A proposed guideline for focusing femtosecond laser pulses into a nonlinear crystal is to take care of a Rayleigh assortment which is at the very least quite a few moments extended when compared to the size from the SHG crystal. This minimizes the chance of damaging the crystal, along with lowers the negative outcomes of spatial period mismatch and spatial (Poynting vector) wander-off.
Pulsed lasers with superior pulse repetition frequencies (PRF) might behave in the same way to CW beams. Regretably, this is very dependent on variables which include absorption and thermal diffusivity, so there isn't any reliable approach for identifying any time a significant PRF laser will harm an optic because of thermal effects.