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The group velocities of the fundamental and next harmonic pulses may also be different, even when stage-matched, as well as the magnitude from the group velocity mismatch relies on the crystal Houses as well as the optical frequencies within the pulses.
The Rayleigh range quantifies the distance, measured through the beam midsection, in excess of which the beam diameter is roughly frequent. The shorter the Rayleigh selection, the more substantial the rate of divergence.
A: A high harm threshold assures the crystal can take care of additional electric power with no degrading, leading to longer lifespan and regular general performance.
We use Numerical Aperture (NA) to explain the extent of the angular material. Ideally, the fundamental laser gentle could well be collimated throughout the crystal, because collimated gentle resembles a group of rays aligned to the exact same path with the NA of zero.
). This spatial focusing constraint about the SHG system will frequently lead to the crystal size normally remaining fewer than the Rayleigh number of the enter targeted pulse.
Humidity can result in water absorption within the crystal surface area, which may degrade its optical functionality. The caliber of the incident light, together with its wavelength, depth, and polarization, also can have an effect on the performance of BBO crystals in several programs.
The angular written content of a targeted beam might be visualized by tracing rays in the lens towards the focal place. Just about every ray drawn in the lens to your tightly concentrated spot (Figure 23) tends to make another angle (ψ) with the Main ray, as well as the number of angles raises While using the NA. Since the number of angles raises past the reference NA filter (or angular domain apodization filter width), the period-matching from the rays beyond the filter width diminishes consequently lessening the SHG conversion performance of Individuals rays.
This residence sets it in addition to linear optical components that don’t alter the frequency of light passing by way of them. Such a distinguishing feature sorts the inspiration for just a plethora of apps that BBO can provide.
It’s like taking an individual Be aware and splitting it into two harmonious tones. This process could be important in several Innovative optical experiments and technologies.
Thorlabs offers a large choice of optics optimized to be used with femtosecond and picosecond laser pulses. Be sure to see down below To learn more.
This attribute interprets to decreased a-BBO Crystal have to have for in depth thermal management techniques, once again accentuating Charge personal savings and process simplicity.
The next harmonic gentle is then polarized parallel for the airplane. Angle tuning adjusts θ and it is done by rotating the crystal across the Y-axis.
Pulsed lasers with higher pulse repetition frequencies (PRF) may well behave similarly to CW beams. However, this is highly depending on aspects including absorption and thermal diffusivity, so there isn't any reliable process for figuring out whenever a significant PRF laser will damage an optic due to thermal effects.