Previous perform showed that the twin-crystal configuration may be used to compensate to the thermal lensing result[

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The pink-shifted Component of the SC is of realistic significance, especially for what problems the overall performance of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The dearth of seed photons in the long-wavelength region on the SC spectrum limitations the amplification efficiency and leads to pulse-to-pulse Electricity fluctuations around the degeneracy region of the optical parametric amplifier. This aspect is quantified in Fig. 6a by plotting the SC spectra concerning spectral Power density, which was believed by measuring the Strength from the axial Portion of SC radiation (which is the sole virtually helpful Element of SC emission). KGW crystal makes the best spectral Electricity density in the 1200�?450 nm array, as noted within a modern study30.

], but it would incorporate a great deal more Price tag to this part. The intra-cavity spectral gain curve can be modulated by inserting an etalon that decreases the particular gain on the wavelength with the utmost acquire aspect[

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Many strategies happen to be adopted to unravel this problem. An acousto-optical programmable dispersive filter may be utilized to modulate the seed’s spectrum to suppress the gain-narrowing influence[

Eventually, we investigated the extensive-phrase performances of SC era in crystal samples beneath best pumping conditions at bigger laser repetition rates. In doing so, the crystal samples weren't translated and retained in the stationary placement with respect into the pump beam in the course of the total measurement. The examples illustrating sturdy extended-expression performances of SC generation in KGW and YAG crystals at higher laser repetition charges might be located somewhere else. More specially, secure efficiency of KGW crystal at 2 MHz pulse repetition fee beneath very similar pump beam concentrating geometry was documented recently30, whereas YAG crystal shown secure performance for several hours at two hundred kHz pulse repetition amount In spite of really tight focusing of your pump beam (NA=0.085)32. The extended-phrase effectiveness tests in LSO, LYSO and YSO unveiled gradual narrowing with the SC spectra over the extensive-wavelength facet that occurred following a particular exposure time and will be attributed to the optical degradation of these supplies. As an illustration, in LSO, the onset of spectral narrowing was noticed soon after (sim twenty) minutes at a here laser repetition level of 10 kHz, whilst in a laser repetition charge of twenty kHz, stable SC generation efficiency was observed just for approximately two min.

Whilst BGO and LT generated the narrowest SC spectra (marginally under 1.5 optical octaves), they may be seen as really attractive nonlinear elements for broadband SC generation with pumping at extended laser wavelengths. Owing to its massive nonlinearity, BGO exhibited the bottom SC generation threshold (78 nJ) Among the many investigated materials, and that is twenty five % reduce than in KGW and could be regarded as exceptional nonlinear material for incredibly reduced-threshold SC era. The noticed secure and sturdy damage-absolutely free performance of BGO and GGG at 200 kHz pulse repetition price indicates that these nonlinear products have a possible for SC era at even better, MHz, repetition premiums. What's more, these resources deliver SC radiation with an excellent list of parameters that are important for apps in substantial speed spectroscopy and imaging that use bulk-created SC, see e.g.seventeen,18,19,twenty.

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A multi-go primary amplifier will further Improve the Power to earlier mentioned 40 mJ. We are going to apply cryogenically cooled Yb:KGW know-how to restrain the thermal impact. Two stages of compression is going to be utilized immediately after amplification. The initial phase involves a typical Treacy-style compressor, and could compress the pulse length to under three hundred fs with an effectiveness of about 70%. The next stage includes a gasoline-filled multi-pass cell[

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]. The dual-crystal configuration lowers the thermal load on each crystal when preserving a higher attain, and facilitates the compensation of every one’s thermal lensing result. As a result, the laser cavity can work with a considerable balance vary in excess of the thermal lensing outcome variation.