A Review Of KGW Crystal
A Review Of KGW Crystal
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Sooner or later, an investigation on the spectral acquire curve of Yb:KGW in the principle amplifier will likely be carried out underneath cryogenic temperature evolution from seventy seven K to three hundred K. The Doing the job temperature will be controlled to understand broader get bandwidth and fewer shift in the central wavelength of the most crucial amplifier.
The red-shifted Portion of the SC is of functional importance, specifically for what fears the general performance of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The dearth of seed photons inside the extended-wavelength region of the SC spectrum limits the amplification efficiency and brings about pulse-to-pulse Vitality fluctuations around the degeneracy location of the optical parametric amplifier. This component is quantified in Fig. 6a by plotting the SC spectra concerning spectral Electricity density, which was estimated by measuring the Electricity from the axial part of SC radiation (and that is the only real virtually valuable part of SC emission). KGW crystal generates the very best spectral Electrical power density inside the 1200�?450 nm array, as noted inside a latest study30.
In distinction, the seed laser may be amplified to around one mJ underneath the orthogonal orientation configuration.
Amplified pulses with an Vitality previously mentioned 2.5 mJ could be anticipated by applying a higher pump energy into the regenerative amplifier and rendering it get the job done for the saturation stage. The laser fluence of ~1 J/cm2 within the dichroic mirrors is believed to be down below the hurt threshold of substantial-top quality dielectric-coated mirrors.
Later on, We are going to adopt a laser seed that has a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to make total use of your gain bandwidth of our regenerative amplifier.
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Ask RP Photonics for virtually get more info any assistance regarding tungstate lasers, such as femtosecond lasers and high-power lasers.
The two-pump laser could give approximately 120 W ability. About sixty% of the utmost pump power was utilized inside our experiment taking into consideration the low effectiveness of the dichroic mirrors. Beneath this twin-crystal configuration, our cavity supports a a hundred W pump electricity enter, as discussed in Part two.two. High-top quality dichroic mirrors might be used in the future, and laser pulses will be stretched to a longer pulse duration.
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-switched laser output underneath the two crystal placement configurations. The black line denotes the configuration Together with the crystals placed in the same orientation, when the pink line is beneath the configuration of crystals placed in orthogonal orientation.
The scattered photons have another wavelength and energy than the incident photons, which creates a Raman spectrum.
An illustration of this sort of conduct is proven in Fig. 7a. The character of spectral changes is highlighted in Fig. 7d, which exhibits how the SC spectrum to the extended-wavelength facet shrinks substantially, from 1800 nm to 1450 nm, just immediately after 8 minutes of publicity time in the stationary sample. LT crystal shown fairly better lengthy-time period overall performance: at pulse repetition costs of up to one hundred kHz no narrowing on both aspect of the SC spectrum was detected. Having said that, speedy narrowing of your SC spectrum in LT crystal was observed following the 1st five minutes of Procedure when the heart beat repetition rate was set at 200 kHz (info not proven). In contrast to the above mentioned products, BGO and GGG shown great SC era performances without any spectral modifications in a pulse repetition level of 200 kHz, as attested by the time number of SC spectra in BGO and GGG, proven in Fig. 7b and c, respectively. Determine 7e and f outline similar designs of SC spectra in the beginning and at the end of one hour-lasting measurement in the two products.