The Ultimate Guide To KGW Crystal
The Ultimate Guide To KGW Crystal
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Down the road, an investigation on the spectral gain curve of Yb:KGW in the key amplifier might be performed below cryogenic temperature evolution from 77 K to 300 K. The Doing the job temperature will be managed to appreciate broader gain bandwidth and less shift with the central wavelength of the leading amplifier.
In addition to its use like a Raman crystal, KGW is usually used in other optical apps, such as in laser techniques and being a scintillator in professional medical imaging.
In contrast, the seed laser might be amplified to in excess of 1 mJ beneath the orthogonal orientation configuration.
Amplified pulses with the Power previously mentioned 2.5 mJ is often anticipated by applying a better pump electrical power to your regenerative amplifier and which makes it work in the saturation degree. The laser fluence of ~1 J/cm2 around the dichroic mirrors is considered to be beneath the injury threshold of substantial-excellent dielectric-coated mirrors.
In the future, We are going to adopt a laser seed that has a broader spectral bandwidth and apply an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to create total use of the attain bandwidth of our regenerative amplifier.
Eventually, we investigated the long-phrase performances of SC generation in crystal samples below optimum pumping circumstances at better laser repetition premiums. In doing so, the crystal samples weren't translated and held within a stationary situation with regard into the pump beam during the full measurement. The illustrations illustrating strong prolonged-expression performances of SC era in KGW and YAG crystals at large laser repetition costs may very well be located elsewhere. A lot more especially, secure functionality of KGW crystal at two MHz pulse repetition price underneath incredibly comparable pump beam focusing geometry was described recently30, whereas YAG crystal demonstrated steady performance for numerous hrs at 200 kHz pulse repetition amount Despite quite limited concentrating of the pump beam (NA=0.085)32. The prolonged-expression general performance tests in LSO, LYSO and YSO exposed gradual narrowing from the SC spectra around the lengthy-wavelength facet that transpired soon after a particular exposure time and could be attributed to the optical degradation of such elements. By way of example, in LSO, the onset of spectral narrowing was observed following (sim twenty) minutes at a laser repetition charge of 10 kHz, when at a laser repetition level of 20 kHz, stable SC technology effectiveness was observed just for approximately two min.
The actual spectra had been reconstructed check here by correcting the measured spectra using an account for that filter transmission features and for that sensitivity capabilities of your spectrometers at the info post-processing phase. The spectral dynamics in each sample was measured by fine tuning the pump pulse Power with a computer-controlled attenuator which was integrated while in the laser technique. Thermal Strength meter EM (Ophir 3A-PF-12) was used to measure the SC Power which was thereafter utilized to estimate the spectral Vitality density from the SC radiation. All the measurements were being carried out without any translation from the sample with respect to the pump beam.
We produced a diode-pumped Yb:KGW regenerative amplifier because the front close of your kilohertz terawatt laser program. Broad bandwidth pulses were being attained by making use of twin crystals with unique orientations of their optical axes[
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KGW has a strong Raman spectrum that extends through the ultraviolet to your in the vicinity of infrared, rendering it practical for An array of apps. The crystal can be utilized being a reference content for Raman spectroscopy, as well as a sample for researching Raman scattering from the good state.
The scattered photons have a special wavelength and Electricity than the incident photons, which produces a Raman spectrum.
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