5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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]. As a result of short storage time, Ti:sapphire is often pumped by frequency-doubled Nd:YAG or Nd:glass good-point out lasers, which leads to a cumbersome and sophisticated system with substantial Value. In contrast with regular CPA laser programs, the OPCPA procedure can receive a shorter pulse duration and a greater peak power.
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In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear components for broadband SC technology within the in close proximity to-infrared and brief-wave infrared spectral ranges, when pumped by a hundred and eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO created two octave-spanning SC spectra, which Review to SC spectra developed in YAG. These components show very comparable performances to YAG also regarding threshold and ideal pump pulse energies for SC generation. Having said that, for what fears the likelihood to operate at significant laser pulse repetition fee, YSO, LSO and LYSO display durable Procedure only at ten kHz and speedily degrade (inside of a couple of minutes) at 20 kHz. Besides the comparatively small SC generation threshold (169 nJ), GGG shown exceptional effectiveness traits in the limited-wave infrared While using the ideal pump pulse energy of 464 nJ, and that is two moments decrease than in YAG: the biggest crimson-shifted spectral broadening and the very best spectral Electricity density, outperforming KGW and YAG crystals in that facet.
Its pump laser needs a short pulse length, a reduced time jitter, and easy temporal and spatial distributions as a result of intrinsic instantaneous system. Thus, the OPCPA method is more intricate and highly-priced.
Amplified pulses by having an Electricity previously mentioned 2.5 mJ is usually expected by applying a higher pump energy for the regenerative amplifier and making it operate on the saturation stage. The laser fluence of ~1 J/cm2 around the dichroic mirrors is believed to become under the problems threshold of substantial-good quality dielectric-coated mirrors.
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Lastly, we investigated the extensive-time period performances of SC technology in crystal samples less than best pumping disorders at increased laser repetition premiums. In doing so, the crystal samples were not translated and saved in a very stationary situation with respect into the pump beam over the full measurement. The examples illustrating robust very long-expression performances of SC era in KGW and YAG crystals at superior laser repetition prices might be identified in other places. More specially, steady efficiency of KGW crystal at two MHz pulse repetition level underneath really comparable pump beam focusing geometry was claimed recently30, While YAG crystal shown secure effectiveness for various several hours at two hundred kHz pulse repetition price even with really tight concentrating of the pump beam (NA=0.085)32. The very long-term overall performance assessments in LSO, LYSO and YSO uncovered gradual narrowing of the SC spectra to the lengthy-wavelength aspect that transpired after a specific publicity time and could be attributed into the optical degradation of such materials. By way of example, in LSO, the onset of spectral narrowing was observed immediately after (sim twenty) minutes in a laser repetition rate of ten kHz, though in a laser repetition fee of 20 kHz, steady SC technology effectiveness was noticed just for approximately two min.
The spectral measurements of filament-induced luminescence advise that scintillating Houses of products might be conveniently researched using femtosecond close to-infrared light-weight source through multiphoton excitation during the filamentation routine, which enables straightforward separation of excitation and emission wavelengths and minimal risk of optical harm.
The two-pump laser could present approximately one hundred twenty W energy. Around sixty% of the maximum pump electric power was used in our experiment looking at the lower effectiveness of your dichroic mirrors. Under this twin-crystal configuration, our cavity supports a 100 W pump electrical power enter, as discussed in Segment 2.2. High-high-quality dichroic mirrors will likely be applied Down the road, and laser pulses will likely be stretched to an extended pulse period.
These components may be used for frequency conversion in lasers for extending of tuning selection. SRS in crystals is compatible with existing all-stable-state engineering and delivers a very simple, compact implies of frequency conversion.
KGW has a strong Raman spectrum that extends through the ultraviolet for the close to infrared, which makes it practical for A selection of programs. The crystal can be used to be a reference materials for Raman spectroscopy, in addition to a sample for researching Raman scattering in the strong state.
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Both equally energies are marked because of the dashed lines as well as their values are labeled in the plots. The similar functions have been click here also observed in KGW and YAG crystals, whose spectral broadening dynamics are demonstrated for any comparison in Fig. 4.