The Ultimate Guide To KGW Crystal
The Ultimate Guide To KGW Crystal
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Previous get the job done showed that the dual-crystal configuration can be utilized to compensate for the thermal lensing impact[
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The obtain bandwidth e.g. of Yb:KGW and Yb:KYW is quite significant in comparison with that of Yb:YAG. This allows for vast wavelength tunability and for Significantly shorter pulse durations from mode-locked lasers. Values properly beneath a hundred fs are actually attained with passive manner locking.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear products for broadband SC technology within the around-infrared and limited-wave infrared spectral ranges, when pumped by 180 fs essential harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Examine to SC spectra made in YAG. These materials exhibit very very similar performances to YAG also when it comes to threshold and best pump pulse energies for SC era. Having said that, for what concerns the possibility to function at large laser pulse repetition amount, YSO, LSO and LYSO display durable operation only at 10 kHz and promptly degrade (in just a few minutes) at twenty kHz. Besides the comparatively small SC generation threshold (169 nJ), GGG shown outstanding functionality attributes during the shorter-wave infrared Together with the optimal pump pulse Vitality of 464 nJ, which is two moments lessen than in YAG: the most important pink-shifted spectral broadening and the highest spectral Vitality density, outperforming KGW and YAG crystals in that facet.
In contrast, the seed laser might be amplified to around one mJ underneath the orthogonal orientation configuration.
Potassium was identified and initially isolated by Sir Humphrey Davy in 1807. Potassium is definitely the seventh most abundant aspect on the planet. It really is Probably the most reactive and electropositive of all metals and speedily oxidizes. As with other alkali metals, potassium decomposes in drinking water Together with the evolution of hydrogen due to its reacts violently with h2o, it only occurs in character in ionic salts.
Several procedures have already been adopted to resolve this problem. An acousto-optical programmable dispersive filter could be utilized to modulate the seed’s spectrum to suppress the get-narrowing outcome[
Ultimately, we investigated the very long-expression performances of SC generation in crystal samples beneath exceptional pumping situations at increased laser repetition prices. In doing so, the crystal samples weren't translated and stored within a stationary situation with regard on the pump beam in the course of the complete measurement. The examples illustrating robust extensive-term performances of SC era in KGW and YAG crystals at significant laser repetition charges could possibly be discovered in other places. A lot more exclusively, secure general performance of KGW crystal at 2 MHz pulse repetition charge under read more really related pump beam focusing geometry was claimed recently30, whereas YAG crystal demonstrated stable overall performance for several several hours at 200 kHz pulse repetition charge In spite of incredibly tight concentrating in the pump beam (NA=0.085)32. The prolonged-term overall performance exams in LSO, LYSO and YSO uncovered gradual narrowing in the SC spectra over the prolonged-wavelength facet that transpired immediately after a specific exposure time and will be attributed to your optical degradation of these elements. For example, in LSO, the onset of spectral narrowing was observed after (sim twenty) minutes in a laser repetition fee of 10 kHz, even though in a laser repetition price of twenty kHz, stable SC technology general performance was observed just for approximately two min.
Talk to RP Photonics for almost any assistance concerning tungstate lasers, such as femtosecond lasers and high-electrical power lasers.
We created a diode-pumped Yb:KGW regenerative amplifier as being the entrance conclude of your kilohertz terawatt laser technique. Wide bandwidth pulses had been received by making use of twin crystals with distinctive orientations in their optical axes[
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）
Due to the fact its discovery in 19701,2, the state of your artwork of supercontinuum (SC) generation in bulk sound-state supplies has attained a significant standard of maturity as a result of huge progress of ultrafast laser resources and basic understanding of the underlying Actual physical processes3,4. The complexity of Actual physical consequences underlying SC era is unveiled while in the framework of femtosecond filamentation, which is a universal phenomenon arising from nonlinear propagation of femtosecond laser pulses in clear materials5. In additional realistic conditions, the attainable spectral extent of SC radiation relies on the fabric properties, including linear and nonlinear indexes of refraction and Vitality bandgap, which along with the laser wavelength outline the crucial electricity for self-focusing (which has for being exceeded for a light-weight filament to kind) and clamping depth of a light filament (which is proportional for the get of multiphoton absorption), respectively.
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An illustration of this kind of conduct is shown in Fig. 7a. The character of spectral modifications is highlighted in Fig. 7d, which displays how the SC spectrum around the extensive-wavelength aspect shrinks noticeably, from 1800 nm to 1450 nm, just just after eight minutes of exposure time within a stationary sample. LT crystal demonstrated rather greater extended-time period effectiveness: at pulse repetition costs of up to a hundred kHz no narrowing on both facet in the SC spectrum was detected. Nevertheless, rapid narrowing of your SC spectrum in LT crystal was observed right after the main 5 minutes of operation when the pulse repetition price was set at two hundred kHz (info not demonstrated). In contrast to the above components, BGO and GGG demonstrated exceptional SC era performances with no spectral improvements in a pulse repetition amount of two hundred kHz, as attested by the point series of SC spectra in BGO and GGG, demonstrated in Fig. 7b and c, respectively. Figure 7e and f define equivalent designs of SC spectra at first and at the conclusion of 1 hour-Long lasting measurement in both supplies.