a-BBO Crystal Options
a-BBO Crystal Options
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The crystal axis is c. The chief ray is parallel to your way used to measure the tuning angle (θ), that is optimized during stage matching. Conversion efficiency is optimized for rays parallel towards the chief ray and even worse for rays at much larger angles (ψ) on the chief ray.
The size on the SHG crystal appreciably has an effect on the spectral width of the reference pulse, or alternatively the bandwidth on the SHG filter.
Another Similarly intriguing application is optical parametric oscillation. In this, BBO allows for the conversion of a photon into two photons with unique frequencies, the sum of which equals the original photon’s frequency.
In quasi-phase matching, the crystal product is “poled�?to own up and down domains to counteract the phase-mismatch of the material, in which the poling period is certain towards the wavelengths of conversation.
Numerous variables can affect the effectiveness of BBO crystals. These include temperature, humidity, and the quality of the incident light. Proper dealing with and storage may help preserve the crystal’s general performance. Temperature can impact the stage-matching conditions of BBO crystals, which in turn affects their effectiveness in frequency conversion apps.
Adverse uniaxial α-BBO crystal is a wonderful birefringent crystal, suited to the manufacture of polarizer, polarization beam displacer, time hold off compensator plate as well as other birefringent product, especially for UV and significant energy laser.
The next harmonic frequency wave is produced as a rare wave, which is polarized orthogonal to the elemental-frequency ordinary wave.
Some makers' SHG crystals, which include Thorlabs', offer around-section-matched conditions for Commonly incident enter mild for just a specified basic frequency. These suppliers polish the faces of your SHG crystals these which the angle concerning the Usually incident light plus the optic axis will be the stage-matched angle for the specified frequency.
But BBO crystals stand resilient, making sure that methods carry on to operate without having hiccups, minimizing downtimes and guaranteeing Expense-success In the end.
The stage velocity is the speed at which the sector provider, i.e. the sine wave, travels in a material. The speed at which a pulse envelope travels in a cloth is called the group velocity and defines the pace with the Power packet comprising the optical pulse traveling as a result of the fabric.
Both of those broad-bandwidth pulses and temporal walk-off cause a reduction inside the conversion performance, in addition to worsen the optical quality of the next harmonic pulses. The suitable here crystal thickness really should be picked to attenuate both equally effects.
Custom made coatings can be applied to the crystal surfaces to improve their overall performance at precise wavelengths or to protect the crystal from environmental variables. Nevertheless, it’s crucial that you Take note that any customization should be finished meticulously to avoid degrading the crystal’s optical Houses.
A recommended guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to maintain a Rayleigh vary that is certainly a minimum of many moments for a longer period in comparison to the duration of the SHG crystal. This minimizes the possibility of detrimental the crystal, along with cuts down the damaging outcomes of spatial section mismatch and spatial (Poynting vector) stroll-off.
On top of that, the structural and compositional attributes of BBO supply it with exceptional thermal security and resistance in opposition to environmental troubles.