A Simple Key For KGW Crystal Unveiled
A Simple Key For KGW Crystal Unveiled
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]. As a result of shorter storage time, Ti:sapphire is often pumped by frequency-doubled Nd:YAG or Nd:glass sound-condition lasers, which ends up in a cumbersome and complex technique with higher Value. When compared with common CPA laser programs, the OPCPA technique can obtain a shorter pulse length and a higher peak electricity.
Although ytterbium-doped laser attain media generally exhibit a little quantum defect, ytterbium-doped tungstates allow for notably little values. One example is, a 1030-nm Yb:YAG laser would Typically be pumped around 940 nm, Whilst Yb:KGW or Yb:KYW might be most efficiently pumped all over 981 nm.
Sooner or later, an investigation on the spectral acquire curve of Yb:KGW in the most crucial amplifier will probably be carried out underneath cryogenic temperature evolution from 77 K to 300 K. The Doing work temperature will be controlled to comprehend broader obtain bandwidth and less change on the central wavelength of the principle amplifier.
The very first two peaks may very well be associated with luminescence of pure material59, although the remaining peaks may very well be attributed into the luminescence of unknown dopants, Even though the supplier specified the sample as undoped. The luminescence of YAG crystal creates strong UV luminescence which has a utmost intensity at 300 nm, that's attributed to blended self-trapped exciton and antisite defect-connected emissions60. Eventually, no luminescence in the UV, noticeable and near-IR was noticed in KGW and LT crystals, a minimum of in the detection selection of fiber spectrometer (two hundred�?00 nm).
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Amplified pulses having an energy above 2.5 mJ might be anticipated by implementing an increased pump ability into the regenerative amplifier and rendering it operate with the saturation level. The laser fluence of ~1 J/cm2 on the dichroic mirrors is considered being underneath the problems threshold of high-quality dielectric-coated mirrors.
Numerous procedures are actually adopted to solve this problem. An acousto-optical programmable dispersive filter can be utilized to modulate the seed’s spectrum to suppress the attain-narrowing result[
Lastly, we investigated the extended-term performances of SC generation in crystal samples below optimal pumping conditions at bigger laser repetition fees. In doing this, the crystal samples weren't translated and retained in the stationary placement with respect towards the pump beam in the course of the entire measurement. The illustrations illustrating robust very long-phrase performances of SC generation in KGW and YAG crystals at significant laser repetition prices could be located somewhere else. Extra specifically, secure performance of KGW crystal at two MHz pulse repetition amount less than incredibly identical pump beam concentrating geometry was noted recently30, While YAG crystal shown steady overall performance for several hours at two hundred kHz pulse repetition amount In spite of really limited concentrating in the pump beam (NA=0.085)32. The lengthy-time period effectiveness assessments in LSO, LYSO and YSO exposed gradual narrowing of your SC spectra to the lengthy-wavelength get more info aspect that transpired just after a certain exposure time and could be attributed towards the optical degradation of those materials. By way of example, in LSO, the onset of spectral narrowing was noticed right after (sim twenty) minutes at a laser repetition fee of 10 kHz, although at a laser repetition charge of 20 kHz, stable SC technology overall performance was observed just for approximately two min.
Thermal effects are drastically scaled-down in KGW. This combined with the high problems threshold make the crystal a wonderful prospect for power scaling. Evaluating Ba(NO3)two and KGW for Raman application Ba(NO3)two are simpler in the event of ns pulses and KGW �?in the event of ps pulses.
Determine 4 Beam radius variation on the two crystals even though shifting the focal length of the thermal lensing influence.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input from the stretcher (incident angle: fifty two°) Which on the compressor incident at the grating had been through the same aspect; as a result, a slight angular tuning from the grating may be designed to acquire the most effective compression consequence. From the compressor, the enter angle about the grating and the space in between the interpretation stage (S1) as well as the transmission grating (TG) have been built to compensate for the stretcher dispersion and all dispersion released by the materials.
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Determine eight Intra-cavity pulse amplification course of action monitored by an oscilloscope. The heartbeat underwent an unsaturated amplification as a result of mirror injury limitation.
Both equally energies are marked from the dashed traces as well as their values are labeled within the plots. The identical characteristics were being also noticed in KGW and YAG crystals, whose spectral broadening dynamics are shown for any comparison in Fig. 4.