a-BBO Crystal Things To Know Before You Buy
a-BBO Crystal Things To Know Before You Buy
Blog Article
The high damage threshold of BBO crystals is especially critical in environments in which superior-intensity lasers will be the norm. Classic resources could falter, degrade, or perhaps crack beneath this kind of intensities.
In combination with their use in laser frequency conversion, BBO crystals have discovered apps in electro-optic modulation and quantum optics experiments.
There are 2 velocities that outline the propagation of sunshine in optical media: the stage and group velocities. The stage velocity is the pace in the provider, the oscillation of the electrical area, as well as the velocity that is matched involving the fundamental and 2nd harmonic frequencies for section matching. The phase velocity relative for the velocity of sunshine in a very vacuum is defined through the index of refraction.
A: A higher harm threshold assures the crystal can deal with additional electrical power with no degrading, resulting in more time lifespan and regular effectiveness.
We use Numerical Aperture (NA) to explain the extent of this angular material. Preferably, the basic laser light could well be collimated all over the crystal, given that collimated light resembles a gaggle of rays aligned to the identical route with the NA of zero.
Now Look at the maximum ability density to that which can be specified as the LIDT for that optic. If your optic was examined at a wavelength besides your working wavelength, the problems threshold have to be scaled appropriately.
Physically, when the basic spectrum is nicely throughout the reference pulse spectrum, the SHG pulse intensity profile may be the square of the elemental intensity profile, properly truncating the duration. This circumstance is illustrated in Figure 20.
It is typically needed to focus the incident light from the crystal for SHG apps, considering the fact that productive generation of next harmonic mild involves large peak intensities, including 109 W/cm2. When using femtosecond pulses with moderate energies from the nanojoule variety, getting the needed peak intensities can call for little focal places.
Now Evaluate the utmost Electrical power density to that which is specified since the LIDT to the optic. When the optic was examined at a wavelength in addition to your functioning wavelength, the hurt threshold have to be scaled appropriately [3].
With good treatment and handling, BBO crystals can final for quite some time. However, their lifespan is usually shortened by factors for example significant temperature, humidity, and physical injury. BBO crystals are sturdy and sturdy, but Like every optical element, they're able to degrade after some time Otherwise appropriately cared for.
Thorlabs offers a wide selection of optics optimized to be used with femtosecond and picosecond laser pulses. Be sure to see underneath for more information.
When evaluating an LIDT specified for the pulsed laser on your laser, it is crucial to understand the subsequent:
When an enter pulse's spectral assortment is equivalent to or narrower when compared to the reference pulse, the produced 2nd harmonic pulse includes a duration click here that is definitely shorter by a factor of 1/√two in addition to a spectral width which is broader by an element of √two.
Pulsed lasers with large pulse repetition frequencies (PRF) may possibly behave in the same way to CW beams. Regrettably, this is very depending on components like absorption and thermal diffusivity, so there's no reliable process for identifying each time a significant PRF laser will injury an optic as a consequence of thermal consequences.