Optical parametric oscillation (OPO): We make the most of OPO to determine our products�?nonlinear conversion performance and period-matching angle to get a offered input wavelength and sign/idler wavelengths. We make sure that our things satisfy the requirements for OPO purposes.
In many conditions, a nonlinear crystal useful for nonlinear frequency conversion has an extremely very long life span, that's for a longer period than that of the whole laser procedure. The crystal material is essentially not modified in the course of Procedure. On the other hand, a lowered crystal life time can occur under many situation:
This is especially critical in biological and clinical investigation where distinct compounds or cells are tagged with fluorescent markers. The 266nm light can excite these markers, earning them get noticed clearly against a history, therefore facilitating comprehensive Investigation.
It is extensively utilized for nonlinear frequency conversion in the ultraviolet, noticeable, and around-infrared. The BBO crystal could be the most important nonlinear crystal for in close proximity to-infrared optical parametric chirped-pulse amplifiers, which at this time deliver number of optical cycle pulses with high normal and ultrahigh peak powers.
BBO includes a low susceptibility to humidity. The AR coating or even the protecting coating (P-coating) over the crystal faces can secure the faces from humidity to some extent. It is fine to go away the crystal in the setup for many optics labs with RH =< 40%. Nonetheless, we propose to shop the crystal in a very desiccator if it won't be employed for over > two weeks to lengthen the crystal life span.
The calculation previously mentioned assumes a uniform beam depth profile. You should now contemplate hotspots while in the beam or other non-uniform intensity profiles and roughly work out a most electric power density.
A suggested guideline for focusing femtosecond laser pulses right into a nonlinear crystal is to take care of a Rayleigh selection that's no less than quite a few situations extended when compared to the size on the SHG crystal. This minimizes the chance of damaging the crystal, and reduces the adverse outcomes of spatial phase mismatch and spatial (Poynting vector) stroll-off.
Nonlinear Crystals of check here possibly β-barium borate (BBO) or lithium triborate (LBO) are useful for frequency conversion of laser resources. BBO crystals characteristic thicknesses from 0.2mm to 0.5mm to attenuate team velocity mismatch and are ideal for frequency doubling or tripling of Ti:Sapphire and Yb:doped laser pulses. The significant and noncritical phase matching LBO crystals are ideal for 2nd or third harmonic generation of Nd:YAG and Yb:doped lasers.
Beam diameter is also crucial that you know when comparing damage thresholds. Though the LIDT, when expressed in units of J/cm², scales independently of location measurement; substantial beam sizes usually tend to illuminate a bigger range of defects which can cause greater variances within the LIDT [four].
Such as, anti-reflective coatings is usually placed on minimize mild loss resulting from reflection, though protecting coatings may be used to raise the crystal’s resistance to environmental elements. Customization allows for ideal overall performance in specific applications.
When evaluating an LIDT specified for the pulsed laser to the laser, it is vital to learn the subsequent:
What's more, BBO crystals are recognized for their large nonlinear coefficient, which enables them to proficiently transform the frequency of light.
The temporal wander-off is commonly regarded as serious in the event the temporal lag exceeds the length of the fundamental pulse. Extreme wander-off may lead to temporal lag that irreparably improves the period from the output 2nd harmonic pulse.
This decreases the helpful conversation measurement in addition to lowers the conversion efficiency. As an example, BBO crystals have an angular stroll-off of concerning 38 mrad for SHG at 1064 nm wavelength, which has to complete with six situations greater than KDP crystals.