Facts About KGW Crystal Revealed
Facts About KGW Crystal Revealed
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The attain bandwidth e.g. of Yb:KGW and Yb:KYW is quite large in contrast with that of Yb:YAG. This permits for large wavelength tunability and for much shorter pulse durations from mode-locked lasers. Values nicely beneath one hundred fs are reached with passive method locking.
At the same time, a shorter laser wavelength can be received; it is feasible to work that has a quantum defect perfectly below one%. Being a consequence, the heat era can be so tiny that this partly compensates the lower thermal conductivity.
The datasets applied and/or analysed throughout The present research available with the corresponding author on reasonable ask for.
In advance of the event of Nd:YAG, Nd3+:CaWO4 was a vital scarce-earth-doped laser attain medium. It had been actually used in the initial consistently functioning crystal laser.
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Eventually, we investigated the prolonged-phrase performances of SC technology in crystal samples below exceptional pumping situations at better laser repetition prices. In doing this, the crystal samples weren't translated and stored in a stationary situation with respect to your pump beam throughout the complete measurement. The examples illustrating strong prolonged-term performances of SC technology in KGW and YAG crystals at substantial laser repetition fees may very well be discovered somewhere else. Additional specially, secure efficiency of KGW crystal at 2 MHz pulse repetition fee below very very similar pump beam focusing geometry was documented recently30, While YAG crystal shown secure general performance for various hours at two hundred kHz pulse repetition price In spite of extremely limited concentrating of the pump beam (NA=0.085)32. The extensive-expression general performance exams in LSO, LYSO and YSO disclosed gradual narrowing in the SC spectra within the extensive-wavelength facet that occurred following a certain publicity time and could be attributed into the optical degradation of those products. For instance, in LSO, the onset of spectral narrowing was noticed following (sim twenty) minutes in a laser repetition price of ten kHz, when in a laser repetition price of twenty kHz, secure SC technology effectiveness was observed just for roughly two min.
While BGO and LT generated the narrowest SC spectra (a little fewer than 1.5 optical octaves), they might be seen as really beautiful nonlinear materials for broadband SC era with pumping at extended laser wavelengths. Owing to its substantial nonlinearity, BGO exhibited the lowest SC era threshold (seventy eight nJ) One of the investigated resources, which is 25 % reduce than in KGW and could be considered as great nonlinear content for very minimal-threshold SC era. The observed steady and durable problems-totally free performance of BGO and GGG at two hundred kHz pulse repetition amount implies that these nonlinear resources have a possible for SC technology at even larger, MHz, repetition charges. Furthermore, these materials deliver SC radiation with a superb list of parameters that are essential for programs in substantial pace spectroscopy and imaging that employ bulk-produced more info SC, see e.g.17,eighteen,19,20.
Figure four Beam radius variation on the two crystals though modifying the focal duration with the thermal lensing influence.
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-switched output spectrum of your regenerative amplifier supports a sub-one hundred sixty fs pulse amplification. Thus, pulses with energies of around 2 mJ and duration below 200 fs is often attained applying bigger-top quality dichroic mirrors and a broader-spectrum laser seed. This regenerative amplifier performs as a great pre-amplifier for further more laser amplification.
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]. The twin-crystal configuration lowers the thermal load on Every single crystal when retaining a significant attain, and facilitates the compensation of every one’s thermal lensing effect. For that reason, the laser cavity can do the job with a large stability range about the thermal lensing impact variation.