a-BBO Crystal - An Overview
a-BBO Crystal - An Overview
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A2: Sure, prolonged publicity to humidity can degrade the optical functionality of BBO crystals. Humidity may lead to drinking water absorption within the crystal surface, which can affect its optical properties.
Although this guideline supplies a normal development, It's not a quantitative Assessment of LIDT vs wavelength. In CW applications, By way of example, damage scales additional strongly with absorption from the coating and substrate, which will not essentially scale well with wavelength.
As opposed to the reference pulse energy spectrum comprising an apodization filter, from the spatial domain the filter will be in NA. The angular area apodization filter however, is just in one-dimension defined by the aircraft k and .
A number of factors can impact the efficiency of BBO crystals. These involve temperature, humidity, and the quality of the incident mild. Appropriate handling and storage might help maintain the crystal’s effectiveness. Temperature can have an affect on the section-matching circumstances of BBO crystals, which in turn impacts their performance in frequency conversion purposes.
Now Evaluate the utmost power density to that and that is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your running wavelength, the harm threshold have to be scaled appropriately.
The second harmonic frequency wave is created as a unprecedented wave, and that is polarized orthogonal to the basic-frequency standard wave.
The damage Investigation will likely be performed on an identical optic (customer's optic won't be ruined). Testing may possibly result in supplemental charges or lead situations. Get hold of Tech Help For more info.
For the reason that refractive index doesn't vary linearly with frequency in dispersive crystals like β-BBO, it truly is not possible to optimally phase match every frequency during the enter pulse's spectral assortment While using the corresponding next harmonic frequency while in the produced pulse.
It’s like using one Take note and splitting it into two harmonious tones. This method may be critical in a lot of State-of-the-art optical experiments and click here systems.
Each wide-bandwidth pulses and temporal stroll-off trigger a reduction from the conversion efficiency, and worsen the optical good quality of the 2nd harmonic pulses. The appropriate crystal thickness must be selected to reduce both consequences.
When evaluating an LIDT specified to get a pulsed laser to the laser, it is critical to grasp the next:
The 2nd harmonic gentle is then polarized parallel into the airplane. Angle tuning adjusts θ and is also done by rotating the crystal throughout the Y-axis.
Pulsed lasers with high pulse repetition frequencies (PRF) may perhaps behave likewise to CW beams. Regretably, this is extremely dependent on things including absorption and thermal diffusivity, so there isn't a dependable system for identifying when a superior PRF laser will harm an optic resulting from thermal outcomes.