A Simple Key For KGW Crystal Unveiled
A Simple Key For KGW Crystal Unveiled
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]. Due to quick storage time, Ti:sapphire is typically pumped by frequency-doubled Nd:YAG or Nd:glass good-state lasers, which leads to a cumbersome and complicated system with superior Expense. Compared with common CPA laser techniques, the OPCPA technique can acquire a shorter pulse period and a better peak ability.
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The gain bandwidth e.g. of Yb:KGW and Yb:KYW is rather massive in comparison with that of Yb:YAG. This allows for large wavelength tunability and for A great deal shorter pulse durations from mode-locked lasers. Values very well underneath 100 fs have been realized with passive method locking.
The crimson-shifted Component of the SC is of simple importance, especially for what concerns the functionality of broadly tunable optical parametric amplifiers pumped by the basic harmonics of Yb lasers. The shortage of seed photons during the long-wavelength location in the SC spectrum limits the amplification effectiveness and brings about pulse-to-pulse Power fluctuations round the degeneracy area on the optical parametric amplifier. This aspect is quantified in Fig. 6a by plotting the SC spectra concerning spectral Strength density, which was estimated by measuring the Vitality in the axial Section of SC radiation (which can be the sole pretty much practical Section of SC emission). KGW crystal produces the best spectral Power density within the 1200�?450 nm range, as pointed out inside of a modern study30.
Alternative of the Computer for a much better a single or maybe a great adjustment of your PC orientation and also the applied high voltage is required to stay clear of this phenomenon. A fast pulse picker can be utilized to improve the nanosecond-scale distinction with the output key pulse.
Amplified pulses with an Power earlier mentioned two.five mJ is often expected by applying a greater pump ability towards the regenerative amplifier and which makes it get the job done in the saturation degree. The laser fluence of ~one J/cm2 within the dichroic mirrors is considered to generally be below the damage threshold of high-high quality dielectric-coated mirrors.
Another was put with its Np -axis parallel With all the s-polarized way. A comparison was created between a configuration Together with the crystals put in the identical orientation (
Eventually, we investigated the extended-phrase performances of SC generation in crystal samples beneath exceptional pumping situations at greater laser repetition rates. In doing this, the crystal samples were not translated and saved in the stationary position with regard for the pump beam during the whole measurement. The illustrations illustrating robust prolonged-phrase performances of SC technology in KGW and YAG crystals at large laser repetition fees could possibly be observed elsewhere. A lot more specially, secure functionality of KGW crystal at two MHz pulse repetition rate under quite identical pump beam concentrating geometry was reported recently30, Whilst YAG crystal demonstrated steady general performance for a number of hrs at 200 kHz pulse repetition level even with really restricted concentrating of the pump beam (NA=0.085)32. The lengthy-expression overall performance assessments in LSO, LYSO click here and YSO discovered gradual narrowing with the SC spectra to the extensive-wavelength facet that happened just after a specific publicity time and will be attributed to your optical degradation of those resources. As an example, in LSO, the onset of spectral narrowing was observed immediately after (sim twenty) minutes at a laser repetition level of ten kHz, while in a laser repetition level of twenty kHz, secure SC technology effectiveness was noticed just for roughly 2 min.
As a result, with a further enhancement inside our regenerative amplifier, 2 mJ compressed pulses might be envisioned, with out detrimental any component within our compressor.
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-switched output spectrum on the regenerative amplifier supports a sub-a hundred and sixty fs pulse amplification. As a result, pulses with energies of approximately two mJ and period down below 200 fs can be obtained employing larger-quality dichroic mirrors and also a broader-spectrum laser seed. This regenerative amplifier will work as a very good pre-amplifier for additional laser amplification.
Determine 4 Beam radius variation on The 2 crystals while altering the focal size of the thermal lensing influence.
KGW crystals are made use of as Raman scattering resources mainly because they have sturdy Raman scattering in a quantity of different wavelengths. When a laser beam is directed on to the crystal, the photons while in the laser beam interact with the crystal lattice, leading to a lot of the photons to scatter in a distinct course.