Getting My KGW Crystal To Work
Getting My KGW Crystal To Work
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While ytterbium-doped laser attain media normally show a small quantum defect, ytterbium-doped tungstates allow for for especially compact values. By way of example, a 1030-nm Yb:YAG laser would normally be pumped close to 940 nm, Whilst Yb:KGW or Yb:KYW could possibly be most proficiently pumped all over 981 nm.
The achieve bandwidth e.g. of Yb:KGW and Yb:KYW is incredibly big compared with that of Yb:YAG. This enables for wide wavelength tunability and for A great deal shorter pulse durations from mode-locked lasers. Values properly below a hundred fs are already achieved with passive method locking.
In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear resources for broadband SC era within the around-infrared and shorter-wave infrared spectral ranges, when pumped by 180 fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Review to SC spectra manufactured in YAG. These products exhibit really similar performances to YAG also with regards to threshold and optimum pump pulse energies for SC generation. Nonetheless, for what considerations the possibility to function at large laser pulse repetition charge, YSO, LSO and LYSO display durable Procedure only at ten kHz and promptly degrade (inside a couple of minutes) at 20 kHz. Besides the rather reduced SC generation threshold (169 nJ), GGG shown exceptional overall performance properties inside the small-wave infrared Using the ideal pump pulse Power of 464 nJ, and that is two occasions decrease than in YAG: the most important pink-shifted spectral broadening and the very best spectral Strength density, outperforming KGW and YAG crystals in that aspect.
], but it would insert a lot more Price tag to this ingredient. The intra-cavity spectral get curve may very well be modulated by inserting an etalon that minimizes the particular attain at the wavelength with the utmost attain aspect[
For tungstates, the ytterbium doping concentration can be extremely superior with out sizeable quenching since the replaced ions have a very identical ion radius, along with the inter-ion length is comparatively significant.
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Comparison of spectral Strength densities of supercontinua generated from the conditions of optimal pumping in the investigated supplies.
We approach to boost the pulse Strength to higher than 40 mJ in two-stage multi-pass amplifiers, akin to a attain factor of 20. In Every amplifier, we may even adopt two cascaded crystals put under orthogonal orientation to reduce the thermal load on Every crystal and compensate to the obtain-narrowing result.
We designed a diode-pumped Yb:KGW regenerative amplifier since the front finish in the kilohertz terawatt laser program. Wide bandwidth pulses ended up attained by making use of dual crystals with unique orientations of their optical axes[
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KGW has a robust Raman spectrum that extends with the ultraviolet to your near infrared, rendering it practical for An array of purposes. The check here crystal may be used being a reference materials for Raman spectroscopy, as well as a sample for researching Raman scattering from the reliable state.
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]. The twin-crystal configuration lowers the thermal load on each crystal when sustaining a substantial attain, and facilitates the payment of each one’s thermal lensing impact. For that reason, the laser cavity can do the job with a sizable stability assortment in excess of the thermal lensing influence variation.