How Much You Need To Expect You'll Pay For A Good a-BBO Crystal
How Much You Need To Expect You'll Pay For A Good a-BBO Crystal
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A2: Of course, extended exposure to humidity can degrade the optical overall performance of BBO crystals. Humidity may result in water absorption around the crystal area, which could have an impact on its optical Homes.
A 2nd concern is that the group velocity mismatch among the second harmonic and essential-frequency pulses will bring about one particular pulse lagging the opposite as The 2 propagate. This is called temporal stroll-off and can come about even underneath ideal phase-matched conditions.
Having said that, to fully use the opportunity of BBO crystals, it is crucial to grasp their properties and the way to manage and retail outlet them properly. These crystals demand mindful handling to stop harm to their surfaces and will be saved in a dry, great area to take care of their optical overall performance.
Other phase matching disorders are doable. Vital Type-II stage matching uses an oe-o or eo-e for good and negative uniaxial crystals. Non-essential phase matching works by using crystal temperature to achieve phase matching rather then angular tuning.
In the situation of Type-I section matching and β-BBO crystals, the fundamental gentle propagates as an extraordinary wave during the crystal, even though the second harmonic light-weight propagates as an ordinary wave.
Though the above mentioned course of action provides a good rule of thumb for LIDT values, be sure to Call Tech Aid if your wavelength differs from the required LIDT wavelength. If the electricity density is a lot less than the altered LIDT with the optic, then the optic should really do the job for your software.
It is usually essential to target a-BBO Crystal the incident light in the crystal for SHG applications, considering the fact that successful generation of second harmonic light involves superior peak intensities, for instance 109 W/cm2. When working with femtosecond pulses with reasonable energies inside the nanojoule assortment, obtaining the required peak intensities can require modest focal spots.
For the reason that refractive index will not differ linearly with frequency in dispersive crystals like β-BBO, it is actually not possible to optimally phase match just about every frequency from the input pulse's spectral variety with the corresponding next harmonic frequency while in the produced pulse.
It’s like getting only one Take note and splitting it into two harmonious tones. This method can be essential in several Innovative optical experiments and systems.
This calculation assumes a uniform beam intensity profile. You should now regulate this Power density to account for hotspots or other nonuniform depth profiles and roughly determine a utmost energy density. For reference a Gaussian beam generally contains a maximum Vitality density that may be 2 times that of the 1/e2 beam.
When selecting an SHG crystal, the heart beat period in the laser source has to be taken into account. A mismatch between the period and crystal thickness will bring about SHG pulses longer in time and narrower in spectral content than doable underneath best conditions.
The physical, chemical, optical, and thermal Homes from the α -BBO are comparable to Individuals of your BBO crystals, even so the α -BBO doesn't show the nonlinear optical properties as a result of central symmetry of its crystal composition.
Also, the structural and compositional characteristics of BBO offer it with impressive thermal balance and resistance towards environmental challenges.