a-BBO Crystal Secrets
a-BBO Crystal Secrets
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Typical cleaning and proper storage can help lengthen the lifespan of BBO crystals. It’s also important to avoid exposing the crystals to circumstances exterior their specified working array, as this may cause everlasting destruction.
Nevertheless, in many scenarios, the main difference in the basic and 2nd harmonic pulse velocities can cause one pulse to substantially lag the opposite.
Yet another Similarly intriguing application is optical parametric oscillation. On this, BBO permits the conversion of a photon into two photons with various frequencies, the sum of which equals the first photon’s frequency.
In lieu of the reference pulse energy spectrum comprising an apodization filter, from the spatial area the filter will be in NA. The angular domain apodization filter however, is only in a single-dimension outlined by the aircraft k and .
The energy density of one's beam need to be calculated concerning J/cm2. The graph to the ideal reveals why expressing the LIDT as an Strength density gives the very best metric for short pulse sources. On this regime, the LIDT offered being an energy density is usually placed on any beam diameter; 1 isn't going to must compute an adjusted LIDT to adjust for variations in spot measurement.
In the case of Style-I stage matching and β-BBO crystals, the elemental light propagates as a rare wave within the crystal, even though the second harmonic gentle propagates as an ordinary wave.
Whilst the above mentioned treatment presents a good rule of thumb for LIDT values, remember to Call Tech Aid In case your wavelength is different from the required LIDT wavelength. In the event your power density is fewer than the adjusted LIDT of the optic, then the optic should operate for the application.
As illustrated in the following desk, the shorter the crystal, the wider the reference pulse spectrum. The desk underneath assumes a basic Heart wavelength inside the near-IR.
Now Review the maximum Strength density to that which can be specified given that the LIDT for the optic. If the optic was tested in a wavelength apart from your functioning wavelength, the injury threshold must be scaled properly [3].
The temporal walk-off with the slower pulse with respect to the speedier is often a considerable portion of the pulse period. That is illustrated in Determine 22.
This calculation assumes a uniform beam intensity profile. It's essential to now regulate this energy density to account for hotspots or other nonuniform depth more info profiles and roughly estimate a highest Electrical power density. For reference a Gaussian beam normally includes a utmost Vitality density that is definitely 2 times that of the one/e2 beam.
When evaluating an LIDT specified for the pulsed laser for your laser, it is important to find out the subsequent:
Nonetheless, the nonlinear optical Homes of a-BBO crystal is vanished as a result of centric symmetry with its crystal construction. It's not at all advisable to work with for NLO processes.
Moreover, the structural and compositional characteristics of BBO deliver it with amazing thermal security and resistance towards environmental difficulties.