Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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The achieve bandwidth e.g. of Yb:KGW and Yb:KYW may be very significant as opposed with that of Yb:YAG. This enables for vast wavelength tunability and for Substantially shorter pulse durations from mode-locked lasers. Values effectively down below 100 fs have already been obtained with passive manner locking.
The pink-shifted part of the SC is of sensible significance, especially for what worries the general performance of broadly tunable optical parametric amplifiers pumped by the basic harmonics of Yb lasers. The lack of seed photons within the extensive-wavelength location on the SC spectrum limits the amplification performance and brings about pulse-to-pulse Electrical power fluctuations round the degeneracy region of the optical parametric amplifier. This factor is quantified in Fig. 6a by plotting the SC spectra regarding spectral Power density, which was believed by measuring the Strength in the axial part of SC radiation (which is the sole basically valuable Portion of SC emission). KGW crystal makes the highest spectral energy density while in the 1200�?450 nm array, as noted within a new study30.
The monoclinic crystal structures ends in a purely natural birefringence, helping to stay clear of thermally induced polarization rotation and depolarization loss.
]. Etalon insertion would lead to additional loss, nonetheless, time-to-time optimization would introduce the risk of ingredient injury and instability into the program. A nonlinear regenerative amplifier could directly supply pulses with a length as little as 97 fs plus a spectral bandwidth of 19 nm[
Many procedures have already been adopted to resolve this problem. An acousto-optical programmable dispersive filter could be utilized to modulate the seed’s spectrum to suppress the acquire-narrowing influence[
Lastly, we investigated the very long-time period performances of SC era in crystal samples below optimum pumping circumstances at increased laser repetition charges. In doing this, the crystal samples were not translated and stored within a stationary place with respect towards the pump beam in the entire measurement. The examples illustrating strong very long-term performances of SC technology in KGW and YAG crystals at large laser repetition fees might be observed elsewhere. Extra exclusively, secure functionality of KGW crystal at two MHz pulse repetition price below quite similar pump beam focusing geometry was documented recently30, Whilst YAG crystal shown secure functionality for get more info many several hours at two hundred kHz pulse repetition amount even with incredibly limited focusing from the pump beam (NA=0.085)32. The long-expression performance exams in LSO, LYSO and YSO unveiled gradual narrowing of your SC spectra around the long-wavelength facet that occurred right after a particular exposure time and will be attributed on the optical degradation of these supplies. As an example, in LSO, the onset of spectral narrowing was noticed immediately after (sim 20) minutes in a laser repetition price of ten kHz, even though at a laser repetition amount of twenty kHz, steady SC technology performance was noticed just for approximately 2 min.
The actual spectra were being reconstructed by correcting the measured spectra by having an account for that filter transmission functions and for your sensitivity functions with the spectrometers at the data write-up-processing stage. The spectral dynamics in Each individual sample was calculated by wonderful tuning the pump pulse Power with a computer-managed attenuator which was integrated within the laser technique. Thermal Strength meter EM (Ophir 3A-PF-12) was accustomed to measure the SC energy which was thereafter utilized to compute the spectral Vitality density of your SC radiation. The many measurements were being executed with no translation of the sample with regard towards the pump beam.
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While BGO, GGG, YSO, LSO and LYSO from time to time serve as laser hosts37, These are mainly determined as efficient scintillators, whose scintillation Attributes are studied very well38. Nevertheless, the nonlinear optical Homes of such crystals and so their potential to function nonlinear components for SC era specifically, and every other experiments regarding nonlinear propagation of intensive femtosecond laser pulses, keep on being very poorly studied. To date, GGG, LT23,25 and YSO24 had been only sketchily tested for SC generation with Ti:sapphire laser pumping, nevertheless, to the most beneficial of our information, none of the investigated supplies were examined with Yb-laser pumping, specifically for what problems their general performance at incredibly substantial (tens to numerous kHz) pulse repetition prices.
The Yb:KGW laser process incorporates a quasi-three-degree actions. The net achieve of the Yb:KGW crystal was not substantial: many tens of roundtrips were necessary to amplify the nanojoule seed to a millijoule level. As a result, the obtain-narrowing effect was inevitable in Yb:KGW regenerative amplifiers.
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]. The twin-crystal configuration lowers the thermal load on Just about every crystal although sustaining a superior achieve, and facilitates the compensation of each’s thermal lensing effect. Hence, the laser cavity can do the job with a substantial stability selection over the thermal lensing result variation.