A Review Of KGW Crystal
A Review Of KGW Crystal
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The thermal conductivity of frequent double tungstates is in the order to 3–4 W/(K m) �?which isn't negative as opposed with other laser crystals (Despite the fact that many instances a lot less than for YAG), and reasonably huge compared Together with the thermal conductivity of normal Eyeglasses.
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In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear products for broadband SC era from the around-infrared and small-wave infrared spectral ranges, when pumped by one hundred eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Review to SC spectra manufactured in YAG. These supplies exhibit pretty identical performances to YAG also regarding threshold and ideal pump pulse energies for SC technology. Even so, for what considerations the possibility to work at superior laser pulse repetition rate, YSO, LSO and LYSO present sturdy Procedure only at ten kHz and quickly degrade (within a few minutes) at twenty kHz. Aside from the fairly lower SC generation threshold (169 nJ), GGG demonstrated wonderful general performance properties during the quick-wave infrared While using the best pump pulse Power of 464 nJ, that's two moments reduced than in YAG: the most important crimson-shifted spectral broadening and the highest spectral Electricity density, outperforming KGW and YAG crystals in that factor.
The monoclinic crystal buildings leads to a normal birefringence, helping to stay clear of thermally induced polarization rotation and depolarization reduction.
The comparison with glasses is acceptable since the massive get bandwidth allows e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
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The black line denotes the configuration with the crystals positioned in the identical orientation, when the pink line is beneath the configuration of crystals placed in orthogonal orientation.
The spectral measurements of filament-induced luminescence propose that scintillating Homes of materials may be conveniently analyzed utilizing femtosecond in close proximity to-infrared gentle source via multiphoton excitation within the filamentation routine, which makes it possible for straightforward separation of excitation and emission wavelengths and low risk of optical injury.
The brink energy for SC generation (hbox E _ textrm th ) was outlined as being the pump pulse Electrical power, exactly where the blue-shifted spectral website broadening immediately settles to a specific Slice-off wavelength That is still almost constant Despite having further more improve from the pump pulse Vitality. The optimum Power (hbox E _textrm opt ), was described given that the pump pulse Electricity, which generates the largest purple-shifted spectral broadening before the onset of periodic modulation from the SC spectrum on account of filament refocusing.
相关工作得到了上海扬帆计划、国家重点研发计划、中国科学院战略性先导科技专项、国家自然科学基金项目、上海市优秀学术/技术带头人计划、上海市市级科技重大专项、中国科学院青年创新促进会的支持。（强场激光物理国家重点实验室供稿）
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KGW crystals are employed as Raman scattering components since they have robust Raman scattering at a quantity of different wavelengths. Any time a laser beam is directed on to the crystal, the photons inside the laser beam interact with the crystal lattice, producing several of the photons to scatter in a special course.