KGW Crystal - An Overview
KGW Crystal - An Overview
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]. As a result of limited storage time, Ti:sapphire is often pumped by frequency-doubled Nd:YAG or Nd:glass good-state lasers, which results in a bulky and complicated method with large cost. When compared with common CPA laser units, the OPCPA system can get hold of a shorter pulse period and an increased peak electric power.
The thermal conductivity of common double tungstates is from the buy to 3–four W/(K m) �?which is not lousy when compared with other laser crystals (Though several moments less than for YAG), and relatively substantial as opposed While using the thermal conductivity of common glasses.
Later on, an investigation to the spectral achieve curve of Yb:KGW in the most crucial amplifier will probably be done underneath cryogenic temperature evolution from seventy seven K to three hundred K. The Doing the job temperature are going to be controlled to comprehend broader achieve bandwidth and less shift at the central wavelength of the key amplifier.
At the same time, a shorter laser wavelength could be acquired; it is achievable to function using a quantum defect nicely beneath 1%. Like a consequence, the heat technology could be so tiny that this partly compensates the reduce thermal conductivity.
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Amplified pulses having an energy above 2.five mJ could be predicted by applying a better pump power to the regenerative amplifier and making it operate within the saturation level. The laser fluence of ~one J/cm2 over the dichroic mirrors is thought to be underneath the hurt threshold of large-high-quality dielectric-coated mirrors.
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Lastly, we investigated the prolonged-expression performances of SC era in crystal samples less than best pumping disorders at larger laser repetition charges. In doing this, the crystal samples weren't translated and held in a stationary position with regard towards the pump beam throughout the total measurement. The examples illustrating strong prolonged-time period performances of SC technology in KGW and YAG crystals at high laser repetition costs may very well be observed somewhere else. Much more specifically, steady functionality of KGW crystal at two MHz pulse repetition amount below very similar pump beam concentrating geometry was claimed recently30, whereas YAG crystal demonstrated steady performance for many hours at 200 kHz pulse repetition rate In spite of pretty tight focusing in the pump beam (NA=0.085)32. The prolonged-time period overall performance exams in LSO, LYSO and YSO uncovered gradual narrowing of the SC spectra within the very long-wavelength aspect that occurred just after a certain publicity time and will be attributed on the optical degradation of those components. As an example, in LSO, the onset of spectral narrowing was noticed soon after (sim 20) minutes at a laser repetition level of ten kHz, even though in a laser repetition charge of 20 kHz, secure SC era overall performance was noticed just for about 2 min.
We approach to boost the heartbeat Electrical power to over 40 mJ in two-stage multi-move amplifiers, comparable to a gain aspect of twenty. In Every single amplifier, we will likely undertake two cascaded crystals positioned beneath orthogonal orientation to lessen the thermal load on each crystal and compensate for the gain-narrowing effect.
Determine four Beam radius variation on the two crystals although modifying the focal length of the thermal lensing outcome.
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A multi-move major amplifier will further boost the Vitality to higher than forty mJ. We're going to utilize cryogenically cooled Yb:KGW technology to restrain the thermal outcome. Two levels of compression will likely be utilised after amplification. The 1st stage requires a typical Treacy-kind compressor, and could compress the pulse length to down below three hundred fs with the effectiveness of approximately 70%. The next phase consists of a fuel-stuffed multi-go mobile[
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KGW crystals are utilised as Raman scattering materials simply because they more info have powerful Raman scattering at a amount of various wavelengths. When a laser beam is directed on to the crystal, the photons in the laser beam connect with the crystal lattice, causing some of the photons to scatter in a unique course.