5 Essential Elements For KGW Crystal
5 Essential Elements For KGW Crystal
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Prior get the job done confirmed that the dual-crystal configuration may be used to compensate for the thermal lensing impact[
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We utilised a transmission grating (TG) being a dispersive component inside our stretcher and compressor. A compact configuration was adopted, where the stretcher along with the compressor shared 1 grating comparable to that in Ref.
Thus There exists small flexibility for optimizing the dispersion compensation effect. Sub-two hundred fs pulses may be predicted having a broader bandwidth seed enter. Thanks to the twin-crystal configuration, the laser cavity provides a around diffraction limited laser beam with M
-switched mode. The bandwidth during the orthogonal orientation was Evidently Substantially broader. The calculated Fourier rework limited pulse duration was as shorter as sub-a hundred and sixty fs. Beneath the configuration where The 2 crystals ended up positioned in the identical orientation, Together with the seed input, the amplified pulse bandwidth was only 3 nm with one hundred eighty μJ Electricity when it broke the dichroic mirrors.
]. Etalon insertion would cause further decline, however, time-to-time optimization would introduce the potential risk of component destruction and instability on the process. A nonlinear regenerative amplifier could right deliver pulses which has a period as low as ninety seven fs as well as a spectral bandwidth of 19 nm[
In the future, We're going to undertake a laser seed that has a broader spectral bandwidth and implement an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to help make comprehensive use on the achieve bandwidth of our regenerative amplifier.
The black line denotes the configuration with the crystals positioned in the exact same orientation, whilst the red line is beneath the configuration of crystals positioned in orthogonal orientation.
]. This method was according to the fact that the spectral emission cross-section curves differ from each other when laser polarization is paralleled to the different optical axis of Yb-doped double tungstates[
The 2-pump laser could supply approximately one hundred twenty W electricity. Somewhere around 60% of the utmost pump power was applied inside our experiment looking at the low effectiveness on the dichroic mirrors. Less than this dual-crystal configuration, our cavity supports a one hundred W pump electric read more power enter, as reviewed in Section 2.two. Superior-high quality dichroic mirrors might be employed Later on, and laser pulses will probably be stretched to a longer pulse period.
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Tungstates have a tendency to acquire significant Raman coefficients (�?Raman scattering). Hence, they're able to deliver sizeable Raman achieve at moderate optical intensities. It is achievable to use the laser crystal itself for a Raman converter.
The scattered photons have another wavelength and Electricity than the incident photons, which produces a Raman spectrum.
An example of this kind of conduct is shown in Fig. 7a. The character of spectral modifications is highlighted in Fig. 7d, which shows how the SC spectrum about the extensive-wavelength side shrinks considerably, from 1800 nm to 1450 nm, just right after 8 minutes of publicity time within a stationary sample. LT crystal shown fairly superior very long-term functionality: at pulse repetition rates of nearly a hundred kHz no narrowing on possibly facet in the SC spectrum was detected. Nonetheless, fast narrowing in the SC spectrum in LT crystal was observed just after the primary 5 minutes of Procedure when the heart beat repetition amount was set at 200 kHz (info not shown). In distinction to the above elements, BGO and GGG demonstrated superb SC era performances with no spectral alterations in a pulse repetition fee of 200 kHz, as attested by the point series of SC spectra in BGO and GGG, revealed in Fig. 7b and c, respectively. Determine 7e and file define similar styles of SC spectra firstly and at the conclusion of 1 hour-lasting measurement in both of those elements.