Facts About KGW Crystal Revealed
Facts About KGW Crystal Revealed
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Former work showed that the dual-crystal configuration can be utilized to compensate for your thermal lensing effect[
The thermal conductivity of widespread double tungstates is from the get to 3–four W/(K m) �?which is not lousy in comparison with other laser crystals (While numerous occasions a lot less than for YAG), and quite huge when compared Using the thermal conductivity of normal Eyeglasses.
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Besides its use as a Raman crystal, KGW can also be Utilized in other optical applications, including in laser devices and to be a scintillator in healthcare imaging.
-switched mode. The bandwidth within the orthogonal orientation was clearly Significantly broader. The calculated Fourier rework constrained pulse duration was as brief as sub-160 fs. Beneath the configuration the place The 2 crystals were being placed in a similar orientation, Using the seed enter, the amplified pulse bandwidth was only 3 nm with 180 μJ Electrical power when it broke the dichroic mirrors.
]. Etalon insertion would cause supplemental reduction, however, time-to-time optimization would introduce the chance of ingredient hurt and instability into the program. A nonlinear regenerative amplifier could right produce pulses using a duration as low as ninety seven fs and also a spectral bandwidth of 19 nm[
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Lastly, we investigated the lengthy-expression performances of SC era in crystal samples below optimum pumping circumstances at larger laser repetition prices. In doing this, the crystal samples weren't translated and kept in a stationary posture with respect to the pump beam during the whole measurement. The illustrations illustrating robust long-expression performances of SC generation in KGW and YAG crystals at significant laser repetition prices could be identified in other places. A lot more exclusively, secure functionality of KGW crystal at two MHz pulse repetition level below incredibly similar pump beam focusing geometry was reported recently30, While YAG crystal shown steady general performance for numerous several hours at two hundred kHz pulse repetition rate In spite of pretty limited focusing with the pump beam (NA=0.085)32. The extensive-expression general performance exams in LSO, LYSO and YSO uncovered gradual narrowing on the SC spectra about the long-wavelength aspect that occurred following a specific publicity time and could be attributed to the optical degradation of those elements. By way of example, in LSO, the onset of spectral narrowing was noticed just after (sim 20) minutes at a laser repetition rate of ten kHz, whilst at a laser repetition amount of 20 kHz, secure SC era overall performance was noticed just for roughly two min.
Ask RP Photonics for virtually any assistance about tungstate lasers, which include femtosecond lasers and high-ability lasers.
The 2-pump laser could offer you as much as a hundred and twenty W electricity. Around sixty% of the maximum pump electric power was applied within our experiment considering the lower performance of the dichroic mirrors. Underneath this dual-crystal configuration, our cavity supports a a hundred W pump power input, as talked about in Part two.two. High-quality dichroic mirrors is going to be used in the future, and laser pulses will likely be stretched to a longer pulse duration.
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-switched laser output underneath the two crystal placement configurations. The black line denotes the configuration Together with the crystals put in the same orientation, even though the crimson line is underneath the configuration of crystals positioned in orthogonal orientation.
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An example of this sort of behaviour is shown in Fig. 7a. The character of spectral adjustments is highlighted in Fig. 7d, which reveals how the SC spectrum about the extended-wavelength aspect shrinks significantly, from 1800 nm to 1450 nm, just right after 8 minutes of publicity time inside of a stationary sample. LT crystal shown rather superior very long-expression performance: at pulse repetition rates of up to a hundred kHz no narrowing on both facet with the SC spectrum was detected. Even so, speedy narrowing of the SC spectrum in LT crystal was noticed right after the very first five minutes of operation when the heartbeat repetition price was established at 200 kHz (details not proven). In distinction to the above resources, BGO and GGG shown outstanding SC technology performances with none spectral alterations in a pulse repetition charge of two hundred kHz, as attested by the point number of SC spectra in BGO and GGG, proven in Fig. 7b and c, respectively. Figure 7e and file define identical shapes of SC spectra firstly and at the conclusion of 1 hour-lasting measurement in each products.