The calculation earlier mentioned assumes a uniform beam depth profile. It's essential to now contemplate hotspots within the beam or other non-uniform intensity profiles and roughly work out a maximum energy density.

The size of the SHG crystal significantly has an effect on the spectral width in the reference pulse, or alternatively the bandwidth on the SHG filter.

Although this rule of thumb presents a common trend, It isn't a quantitative Examination of LIDT vs wavelength. In CW apps, For example, harm scales more strongly with absorption while in the coating and substrate, which does not necessarily scale nicely with wavelength.

As Formerly stated, pulsed lasers commonly induce a special sort of damage for the optic than CW lasers. Pulsed lasers typically never heat the optic enough to break it; alternatively, pulsed lasers deliver strong electric fields effective at inducing dielectric breakdown in the fabric.

From the ray-product point of view, the propagation path defines the orientation of your central (Main) ray in Determine 23. The SHG process is influenced with the variety of angles about which incident gentle propagates, simply because light-weight that isn't parallel towards the chief ray has lessened section-matching relative to your chief ray.

Provided these apps, it’s apparent why BBO, with its inherent ability to successfully develop the 266nm wavelength, is so highly prized. The crystal’s distinctive nonlinear optical Qualities permit the conversion of other wavelengths in the coveted 266nm mild, making certain that researchers and industries have entry to this critical Instrument.

Although the test outcomes are only consultant of 1 coating run, Thorlabs specifies harm threshold values that account for coating variances.

Rather than decompose the SHG polarization into parts Ex and Ez, The sunshine is typically referred to as a unprecedented wave (E'e) using a refractive index, n'e. During the diagram on the correct, n'e, which will depend on θ, is indicated with the intersection from the conic segment illustrated via the purple ellipse Using the XZ plane.

Assuming a crystal of a offered thickness, it can be done to outline a reference pulse using a spectral array which is the most which can be adequately stage matched. This spectral bandwidth limitation can also be thought of concerning an SHG spectral filter whose passband will depend on the two the precise crystal and the heartbeat's Heart frequency. Frequencies outside of this filter’s passband might be rejected from going through the SHG process.

Thus, the second harmonic pulse spectrum, revealed on the best, has a spectral width somewhere around the same as The perfect situation. Preferably, every single frequency in get more info the fundamental pulse spectrum might be simultaneously period matched.

Filters under or the form at The underside can be utilized to aid solution research or make further more inquiries.

For beams with a superior PRF both equally the common and peak powers must be compared to the equal CW electricity. In addition, for highly transparent supplies, there is very little to no drop during the LIDT with rising PRF.

A suggested guideline for concentrating femtosecond laser pulses right into a nonlinear crystal is to maintain a Rayleigh vary that is definitely at the least a number of times extended as opposed to length with the SHG crystal. This minimizes the possibility of harming the crystal, and also minimizes the destructive results of spatial section mismatch and spatial (Poynting vector) stroll-off.

Era of deep ultraviolet radiation at 210 nm by Variety-I 3rd harmonic era is attained within a pair of BBO crystals with conversion efficiency as high as 36%.