The 2-Minute Rule for KGW Crystal
The 2-Minute Rule for KGW Crystal
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]. As a result of brief storage time, Ti:sapphire is typically pumped by frequency-doubled Nd:YAG or Nd:glass good-state lasers, which leads to a cumbersome and complex technique with significant Expense. Compared with standard CPA laser units, the OPCPA technique can get a shorter pulse period and a higher peak power.
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Along with its use to be a Raman crystal, KGW is also Utilized in other optical programs, like in laser systems and for a scintillator in clinical imaging.
Its pump laser requires a brief pulse period, a very low time jitter, and smooth temporal and spatial distributions due to the intrinsic instantaneous approach. So, the OPCPA system is more complicated and highly-priced.
The comparison with glasses is suitable For the reason that massive attain bandwidth enables e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
One other was positioned with its Np -axis parallel Together with the s-polarized way. A comparison was manufactured amongst a configuration While using the crystals placed in precisely the same orientation (
Comparison of spectral Strength densities of supercontinua made inside the circumstances of ideal pumping from the investigated resources.
Whilst BGO and LT created the narrowest SC spectra (slightly lower than one.five optical octaves), they may be viewed as really appealing nonlinear materials for broadband SC technology with pumping at more time laser wavelengths. Owing to its significant nonlinearity, BGO exhibited the bottom SC technology threshold (seventy eight nJ) among the investigated supplies, that's twenty five % decreased than in KGW and will be regarded as superb nonlinear substance for very reduced-threshold SC era. The observed steady and sturdy destruction-totally free functionality of BGO and GGG at two hundred kHz pulse repetition amount implies that these nonlinear products have a possible for SC technology at even higher, MHz, repetition fees. Furthermore, these components give SC radiation with an outstanding list of parameters that happen to be important for purposes in significant pace spectroscopy and imaging that utilize bulk-produced SC, see e.g.17,18,19,twenty.
The threshold Vitality for SC technology (hbox E _ textrm th ) was defined because the pump pulse Electricity, where the blue-shifted spectral broadening swiftly settles to a particular Slash-off wavelength that remains Nearly consistent In spite of further more improve in the pump pulse Electrical power. The ideal energy (hbox E _textrm choose ), was described as the pump pulse Power, which generates the biggest purple-shifted spectral broadening ahead of the onset of periodic modulation during the SC spectrum due to filament refocusing.
Although BGO, GGG, YSO, LSO and LYSO once in a while serve as laser hosts37, They are really largely identified as successful scintillators, whose scintillation Qualities are examined really well38. However, the nonlinear optical Homes of such crystals and so their likely to serve as nonlinear resources for more info SC generation specifically, and almost every other experiments concerning nonlinear propagation of extreme femtosecond laser pulses, continue being very badly analyzed. To this point, GGG, LT23,25 and YSO24 had been only sketchily examined for SC technology with Ti:sapphire laser pumping, having said that, to the most effective of our know-how, none of the investigated elements have been examined with Yb-laser pumping, specifically for what considerations their efficiency at extremely high (tens to many hundreds of kHz) pulse repetition charges.
Considering that its discovery in 19701,2, the point out on the artwork of supercontinuum (SC) generation in bulk sound-state supplies has attained a large level of maturity owing to incredible development of ultrafast laser resources and basic knowledge of the underlying physical processes3,four. The complexity of Bodily results fundamental SC generation is unveiled in the framework of femtosecond filamentation, that's a common phenomenon arising from nonlinear propagation of femtosecond laser pulses in transparent materials5. In more sensible conditions, the attainable spectral extent of SC radiation is determined by the fabric properties, for example linear and nonlinear indexes of refraction and Electrical power bandgap, which together with the laser wavelength outline the critical electrical power for self-concentrating (that has to become exceeded for a light filament to type) and clamping depth of a lightweight filament (which is proportional for the buy of multiphoton absorption), respectively.
The scattered photons have a distinct wavelength and Power in comparison to the incident photons, which creates a Raman spectrum.
The two energies are marked because of the dashed strains and their values are labeled while in the plots. The equivalent features had been also observed in KGW and YAG crystals, whose spectral broadening dynamics are demonstrated for just a comparison in Fig. 4.