The crystal axis is c. The Main ray is parallel into the direction utilized to measure the tuning angle (θ), which is optimized for the duration of phase matching. Conversion performance is optimized for rays parallel to your chief ray and worse for rays at much larger angles (ψ) to the chief ray.
Inside the sophisticated tapestry of photonics, the 266nm era, backed from the prowess of BBO, emerges like a thread of paramount importance.
The power of BBO crystals to alter the frequency of sunshine has designed them indispensable in laser engineering. They may have enabled the creation of a wide spectrum of sunshine hues, far past what's immediately obtainable from readily available laser resources.
In quasi-period matching, the crystal material is “poled�?to obtain up and down domains to counteract the phase-mismatch of the material, exactly where the poling period is specific towards the wavelengths of interaction.
The stage-matching capabilities of BBO crystals are worthy of Distinctive point out. In the intricate dance of photons, exactly where conversion from a single wavelength to a different is often ideal, the stage-matching provided by BBO makes sure that Electrical power losses are negligible.
Thorlabs expresses LIDT for CW lasers for a linear electricity density measured in W/cm. On this regime, the LIDT given for a linear electricity density is often placed on any beam diameter; a person isn't going to ought to compute an adjusted LIDT to adjust for changes in location measurement, as demonstrated from the graph to the proper. Normal linear ability density might be calculated using the equation below.
Physically, when the basic spectrum is well throughout the reference pulse spectrum, the SHG pulse intensity profile is the sq. of the basic depth profile, successfully truncating the length. This circumstance is illustrated in Figure 20.
The hurt Assessment will probably be performed on an identical optic (shopper's optic won't be weakened). Testing may lead to additional costs or guide periods. Make contact with Tech Guidance For more info.
When pulse lengths are in between 1 ns and 1 µs, laser-induced damage can occur either due to absorption or simply a dielectric breakdown (consequently, a person must Check out equally CW and pulsed LIDT). Absorption is both as a result of an intrinsic home from the optic or due to area irregularities; Consequently LIDT values are only valid for optics meeting or exceeding the surface quality technical specs supplied by a manufacturer.
However, there is not any second get nonlinear impact in alpha-BBO crystal mainly because of the centrosymmetry in its crystal construction and so it has no use for next get nonlinear optical procedures. Alternatively, alpha-BBO is greatly utilized for fabrication of polarizers, polarizing beam displacers, period retarders, birefringent plates, and time hold off compensators Specifically Those people for UV and higher electric power lasers.
Thorlabs offers a large choice of optics optimized for use with femtosecond and picosecond laser pulses. Make sure you see under To find out more.
This characteristic interprets to minimized require for comprehensive thermal management methods, once more accentuating Price financial savings and system simplicity.
When an input pulse's spectral assortment is equal to or narrower compared to reference pulse, the generated second harmonic pulse has a period that may be shorter by an element of one/√two in addition to a spectral width that click here may be broader by an element of √2.
The issue that arises when employing ultrashort pulses for next harmonic era (SHG) is usually that shorter pulses have larger bandwidths, but the ideal phase-matched situation could be reached For less than an individual elementary wavelength at a time. On account of this, the caliber of the stage match could be substantially worse in the direction of the spectral edges of broad-bandwidth pulses.