5 Tips about KGW Crystal You Can Use Today
5 Tips about KGW Crystal You Can Use Today
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The thermal conductivity of prevalent double tungstates is from the purchase to three–4 W/(K m) �?which isn't negative when compared with other laser crystals (While quite a few times fewer than for YAG), and fairly big when compared While using the thermal conductivity of regular Eyeglasses.
For a few programs, tungstates offer a combination of several helpful Qualities. In particular for passive method locking, ytterbium-doped double tungstates will often be exceptional to other media when it comes to The mixture of substantial obtain bandwidth, massive cross-sections, and relatively excellent thermal Attributes �?While in Just about every unique self-discipline much better materials could possibly be located.
In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear products for broadband SC era during the close to-infrared and short-wave infrared spectral ranges, when pumped by a hundred and eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Examine to SC spectra produced in YAG. These elements exhibit really equivalent performances to YAG also when it comes to threshold and best pump pulse energies for SC generation. However, for what considerations the likelihood to operate at large laser pulse repetition level, YSO, LSO and LYSO clearly show resilient operation only at 10 kHz and quickly degrade (in a couple of minutes) at twenty kHz. Other than the comparatively lower SC technology threshold (169 nJ), GGG demonstrated fantastic overall performance properties during the short-wave infrared While using the best pump pulse energy of 464 nJ, that's two situations reduce than in YAG: the biggest crimson-shifted spectral broadening and the best spectral Power density, outperforming KGW and YAG crystals in that part.
In contrast, the seed laser can be amplified to around 1 mJ under the orthogonal orientation configuration.
]. Etalon insertion would produce further decline, nevertheless, time-to-time optimization would introduce the risk of ingredient harm and instability into the system. A nonlinear regenerative amplifier could specifically deliver pulses using a duration as little as ninety seven fs along with a spectral bandwidth of 19 nm[
Several methods happen to be adopted to solve this problem. An acousto-optical programmable dispersive filter can be used to modulate the seed’s spectrum to suppress the achieve-narrowing outcome[
The black line denotes the configuration with the crystals placed in exactly the same orientation, when the pink line is beneath the configuration of crystals positioned in orthogonal orientation.
We plan to boost the heartbeat Electricity to higher than forty mJ in two-phase multi-go amplifiers, equivalent to a achieve component of twenty. In Each individual amplifier, we can even undertake two cascaded crystals put underneath orthogonal orientation to decrease the thermal load on Every crystal and compensate for that get-narrowing influence.
Figure 4 Beam radius variation on The 2 crystals although transforming the focal duration with the thermal lensing effect.
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Tungstates are likely to get superior Raman coefficients (�?Raman scattering). As a result, they might produce important Raman gain at moderate optical intensities. It is achievable to utilize the laser crystal itself like a Raman converter.
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]. The twin-crystal configuration lowers the thermal load on Every single crystal while keeping a higher get, and facilitates the compensation of each one’s thermal lensing influence. Consequently, the laser cavity can get the job done with a significant security vary around the thermal lensing result variation.