5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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For some programs, tungstates supply a combination of many handy Houses. Particularly for passive manner locking, ytterbium-doped double tungstates in many cases are outstanding to other media in terms of The mixture of higher gain bandwidth, huge cross-sections, and comparatively good thermal Qualities �?Regardless that in each individual willpower much better elements can be identified.
In addition to its use to be a Raman crystal, KGW is likewise used in other optical apps, like in laser programs and as being a scintillator in professional medical imaging.
], but it would insert far more Price tag to this ingredient. The intra-cavity spectral obtain curve could be modulated by inserting an etalon that lowers the actual achieve with the wavelength with the utmost attain variable[
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Various procedures happen to be adopted to resolve this issue. An acousto-optical programmable dispersive filter is usually utilized to modulate the seed’s spectrum to suppress the obtain-narrowing outcome[
Eventually, we investigated the extended-term performances of SC era in crystal samples under exceptional pumping problems at higher laser repetition rates. In doing so, the crystal samples weren't translated and stored within a stationary situation with regard to the pump beam over the full measurement. The examples illustrating strong extended-time period performances of SC era in KGW and YAG crystals at substantial laser repetition costs could be identified somewhere else. A lot more precisely, steady overall performance of KGW crystal at 2 MHz pulse repetition amount below incredibly similar pump beam focusing geometry was claimed recently30, While YAG crystal shown stable functionality for various hrs at two hundred kHz pulse repetition level In spite of quite tight concentrating of the pump beam (NA=0.085)32. The extensive-term performance tests in LSO, LYSO and YSO discovered gradual narrowing from the SC spectra about the very long-wavelength side that transpired right after a certain exposure time and will be attributed towards the optical degradation of such components. By way of example, in LSO, the onset of spectral narrowing was noticed soon after (sim twenty) minutes in a laser repetition fee of 10 kHz, whilst in a laser repetition price of 20 kHz, secure SC era functionality was observed just for approximately 2 min.
]. This process was depending on The truth that the spectral emission cross-portion curves vary from each other when laser polarization is paralleled to the several optical axis of Yb-doped double tungstates[
The two-pump laser could present nearly a hundred and twenty W power. Around 60% of the utmost pump electricity was used within our experiment considering the very low general performance of your dichroic mirrors. Less than this twin-crystal configuration, our cavity supports a one hundred W pump electricity input, as mentioned in Segment 2.two. Superior-high-quality dichroic mirrors are going to be made use of Sooner or later, and laser pulses is going to be stretched to a longer pulse duration.
Though BGO, GGG, YSO, LSO and LYSO sometimes function laser hosts37, They may be mostly identified as successful scintillators, whose scintillation properties are studied pretty well38. Nonetheless, the nonlinear optical properties of these crystals and so their prospective to function nonlinear components for SC technology especially, and any other experiments relating to nonlinear propagation of intensive femtosecond laser pulses, continue being extremely inadequately researched. So far, GGG, LT23,twenty five and YSO24 were only sketchily analyzed for SC technology with Ti:sapphire laser pumping, having said that, to the most beneficial of our understanding, Not one of the investigated supplies were being examined with Yb-laser pumping, especially for what considerations their efficiency at incredibly higher (tens to countless kHz) pulse repetition premiums.
The Yb:KGW laser technique incorporates a quasi-3-level click here actions. The web attain of the Yb:KGW crystal wasn't significant: numerous tens of roundtrips ended up necessary to amplify the nanojoule seed to the millijoule level. Thus, the acquire-narrowing impact was inevitable in Yb:KGW regenerative amplifiers.
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