Previous work showed that the twin-crystal configuration can be used to compensate for your thermal lensing effect[

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The crimson-shifted Component of the SC is of realistic great importance, specifically for what concerns the efficiency of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The shortage of seed photons from the very long-wavelength location with the SC spectrum boundaries the amplification effectiveness and leads to pulse-to-pulse Vitality fluctuations throughout the degeneracy region of the optical parametric amplifier. This aspect is quantified in Fig. 6a by plotting the SC spectra concerning spectral Electrical power density, which was approximated by measuring the Strength of your axial Element of SC radiation (and that is the one pretty much useful Portion of SC emission). KGW crystal provides the very best spectral Electricity density inside the 1200�?450 nm vary, as famous in a new study30.

The monoclinic crystal buildings ends in a natural birefringence, assisting to steer clear of thermally induced polarization rotation and depolarization reduction.

The comparison with Eyeglasses is suitable since the large achieve bandwidth permits e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.

Several strategies are adopted to unravel this issue. An acousto-optical programmable dispersive filter is usually utilized to modulate the seed’s spectrum to suppress the attain-narrowing outcome[

In its elemental form, gadolinium incorporates a silvery-white physical appearance. Gadolinium is usually a rare earth or lanthanide ingredient that possesses special properties beneficial to specialized applications for instance semiconductor fabrication and nuclear reactor shielding. It is actually utilized for equally its significant magnetic minute (7.94μ B) As well as in phosphors and scintillator crystals. When complexed with EDTA ligands, it can be made use of as an injectable contrast agent for MRIs. The ingredient is named following the Finnish chemist and geologist Johan Gadolin.

Though BGO and LT manufactured the narrowest SC spectra (a little below one.five optical octaves), they may be viewed as quite eye-catching nonlinear products for broadband SC era with pumping at lengthier laser wavelengths. Owing to its huge nonlinearity, BGO exhibited the bottom SC generation threshold (78 nJ) Amongst the investigated products, which can be twenty five % lessen than in KGW and could be considered as exceptional nonlinear materials for incredibly small-threshold SC generation. The observed stable and durable hurt-no cost efficiency of BGO and GGG at 200 kHz pulse repetition fee indicates that these nonlinear elements have a possible for SC technology at even bigger, MHz, repetition rates. Also, these materials offer SC radiation with a great set of parameters which can be essential for programs in substantial pace spectroscopy and imaging that utilize bulk-produced SC, see e.g.17,eighteen,19,twenty.

Determine four Beam more info radius variation on The 2 crystals though transforming the focal duration of the thermal lensing result.

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）

A multi-move major amplifier will even further Improve the Electrical power to higher than forty mJ. We are going to implement cryogenically cooled Yb:KGW know-how to restrain the thermal influence. Two phases of compression will likely be employed right after amplification. The initial stage involves a standard Treacy-variety compressor, and could compress the pulse period to under 300 fs having an performance of about 70%. The second phase consists of a gasoline-filled multi-go cell[

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]. The dual-crystal configuration lowers the thermal load on each crystal whilst keeping a large gain, and facilitates the payment of each’s thermal lensing result. Hence, the laser cavity can do the job with a large stability array more than the thermal lensing outcome variation.