An Unbiased View of KGW Crystal
An Unbiased View of KGW Crystal
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Sooner or later, an investigation to the spectral gain curve of Yb:KGW in the primary amplifier might be done underneath cryogenic temperature evolution from 77 K to 300 K. The Operating temperature will likely be controlled to comprehend broader obtain bandwidth and less change within the central wavelength of the most crucial amplifier.
Simultaneously, a shorter laser wavelength is usually acquired; it is feasible to operate using a quantum defect perfectly below one%. As a consequence, the warmth technology is often so smaller that this partly compensates the reduced thermal conductivity.
Its pump laser desires a short pulse period, a very low time jitter, and easy temporal and spatial distributions because of the intrinsic instantaneous method. Hence, the OPCPA method is much more difficult and expensive.
For tungstates, the ytterbium doping concentration can be quite high without having sizeable quenching because the replaced ions have a really related ion radius, as well as inter-ion distance is pretty big.
On the other hand, the moment Nd3+:YAG became commercially out there, the interest in CaWO4 dropped sharply. In later on decades, specific other tungstate crystals began to attract plenty of notice.
At last, we investigated the extensive-phrase performances check here of SC generation in crystal samples underneath ideal pumping situations at larger laser repetition charges. In doing so, the crystal samples weren't translated and stored in a stationary situation with respect towards the pump beam during the entire measurement. The illustrations illustrating robust very long-phrase performances of SC technology in KGW and YAG crystals at higher laser repetition rates may very well be identified elsewhere. Additional particularly, steady overall performance of KGW crystal at two MHz pulse repetition charge less than extremely identical pump beam focusing geometry was documented recently30, While YAG crystal shown stable effectiveness for many hours at 200 kHz pulse repetition charge In spite of incredibly limited concentrating of your pump beam (NA=0.085)32. The long-term overall performance exams in LSO, LYSO and YSO unveiled gradual narrowing on the SC spectra about the prolonged-wavelength facet that transpired following a specific publicity time and will be attributed on the optical degradation of those products. For instance, in LSO, the onset of spectral narrowing was noticed soon after (sim twenty) minutes at a laser repetition charge of 10 kHz, when at a laser repetition rate of twenty kHz, steady SC technology functionality was observed just for about two min.
]. This process was depending on The reality that the spectral emission cross-part curves vary from each other when laser polarization is paralleled to the various optical axis of Yb-doped double tungstates[
Determine 4 Beam radius variation on the two crystals though modifying the focal length of your thermal lensing outcome.
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The Yb:KGW laser process features a quasi-3-stage actions. The net obtain with the Yb:KGW crystal wasn't high: many tens of roundtrips were being needed to amplify the nanojoule seed to your millijoule amount. So, the attain-narrowing effect was inevitable in Yb:KGW regenerative amplifiers.
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