New Step by Step Map For KGW Crystal
New Step by Step Map For KGW Crystal
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For a few apps, tungstates supply a mix of various practical Houses. Specifically for passive manner locking, ytterbium-doped double tungstates are frequently top-quality to other media in terms of The mixture of substantial attain bandwidth, significant cross-sections, and comparatively superior thermal properties �?While in Each individual specific self-discipline much better supplies may be discovered.
In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear components for broadband SC generation from the close to-infrared and short-wave infrared spectral ranges, when pumped by 180 fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO made two octave-spanning SC spectra, which Examine to SC spectra made in YAG. These resources exhibit pretty very similar performances to YAG also with regards to threshold and best pump pulse energies for SC era. On the other hand, for what concerns the chance to operate at high laser pulse repetition rate, YSO, LSO and LYSO exhibit long lasting Procedure only at ten kHz and swiftly degrade (in just a few minutes) at 20 kHz. Other than the reasonably small SC generation threshold (169 nJ), GGG demonstrated fantastic effectiveness characteristics from the shorter-wave infrared With all the optimum pump pulse Electrical power of 464 nJ, which is two instances decreased than in YAG: the biggest red-shifted spectral broadening and the very best spectral Vitality density, outperforming KGW and YAG crystals in that part.
], but it will include a great deal more Charge to this component. The intra-cavity spectral gain curve might be modulated by inserting an etalon that minimizes the actual acquire with the wavelength with the most get issue[
Potassium was learned and 1st isolated by Sir Humphrey Davy in 1807. Potassium is the seventh most ample factor on the planet. It is One of the more reactive and electropositive of all metals and quickly oxidizes. Just like other alkali metals, potassium decomposes in drinking water While using the evolution of hydrogen due to its reacts violently with drinking water, it only happens in mother nature in ionic salts.
Later on, we will adopt a laser seed that has a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum for making full use from the obtain bandwidth of our regenerative amplifier.
Eventually, we investigated the lengthy-term performances of SC technology in crystal samples under optimal pumping circumstances at bigger laser repetition rates. In doing this, the crystal samples weren't translated and stored within a stationary position with regard to the pump beam in the complete measurement. The illustrations illustrating strong very long-time period performances of SC technology in KGW and YAG crystals at substantial laser repetition premiums could be identified in other places. Extra especially, stable effectiveness of KGW crystal at two MHz pulse repetition level underneath really identical pump beam concentrating geometry was claimed recently30, whereas YAG crystal demonstrated stable effectiveness for quite a few hrs at two hundred kHz pulse repetition level Despite incredibly tight focusing on the pump beam (NA=0.085)32. The long-phrase performance checks in LSO, LYSO and YSO disclosed gradual narrowing on the SC spectra around the extensive-wavelength side that occurred right after a specific exposure time and could be attributed for the optical degradation of these elements. For instance, in LSO, the onset of spectral narrowing was noticed right after (sim 20) minutes in a laser repetition rate of 10 kHz, when in a laser repetition charge of twenty kHz, secure SC technology performance was noticed just for approximately 2 min.
We prepare to boost the pulse Electrical power to over 40 mJ in two-stage multi-pass amplifiers, corresponding to a get factor of twenty. In each amplifier, we will also undertake two cascaded crystals placed below orthogonal orientation to lessen the thermal load on Each individual crystal and compensate to the gain-narrowing impact.
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The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter of your stretcher (incident angle: fifty two°) Which of the compressor incident for the grating were being from your exact same side; for this reason, a slight angular tuning with the grating might be created to get the top compression result. While in the compressor, the input angle on the grating and the gap between the translation phase (S1) plus the transmission grating (TG) ended up made to compensate for that stretcher dispersion and all dispersion released from the products.
-switched laser output beneath the two crystal placement configurations. The black line denotes the configuration While using the crystals placed in a similar orientation, though the crimson line is under the configuration of crystals put in orthogonal orientation.
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An illustration of these conduct is revealed in Fig. 7a. The character of spectral variations is highlighted in Fig. 7d, which displays how the SC spectrum about the extensive-wavelength facet shrinks noticeably, from 1800 nm to 1450 nm, just soon after 8 minutes of publicity time within a stationary sample. LT crystal demonstrated fairly greater extensive-term performance: at pulse repetition prices of up to 100 kHz no narrowing on possibly side in the SC spectrum was detected. Having said that, quick narrowing of your SC spectrum in LT crystal was observed just after the main five minutes of Procedure when the heart beat repetition rate was set at two hundred kHz (facts not revealed). In contrast to the above elements, BGO and GGG demonstrated fantastic SC era performances without any spectral modifications at a pulse repetition rate of two hundred kHz, as attested by the time series of SC spectra in BGO and GGG, revealed in Fig. 7b and c, respectively. Figure 7e and f define similar designs of SC spectra at the beginning and at the conclusion of one hour-lasting measurement in both elements.