The KYW Crystal Diaries
The KYW Crystal Diaries
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The attain bandwidth e.g. of Yb:KGW and Yb:KYW is incredibly large when compared with that of Yb:YAG. This permits for huge wavelength tunability and for Substantially shorter pulse durations from method-locked lasers. Values properly below one hundred fs are realized with passive manner locking.
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Femtosecond laser dependant on Yb:KYW crystals with suppression of spectral narrowing inside of a regenerative amplifier by spectral profiling of the pulse
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This paper describes a femtosecond laser regenerative amplifier based on two Yb:KYW crystals with immediate longitudinal pumping by highly effective linear arrays of semiconductor injection lasers having fiber output. To circumvent spectral narrowing through amplification and also the corresponding lengthening with the amplified pulse when it can be compressed, a mix of two Yb:KYW crystals were utilised, While using the spectral maxima on the amplification shifted relative to each other and with spectral profiling with the amplified radiation.
Immediately after air drying and subsequent cleaning having a cotton fabric soaked in Alcoholic beverages, the movie surface confirmed no indications of peeling or scratches.
FIG. one. Optical format of a laser with immediate pumping While using the radiation of semiconductor injection lasers. LD is an IPG Photonics laser diode with fiber output
five mm other than the center from the beam caustic. So that you can Examine the manner matching simulation, we done the experiment with Ng-Lower crystal oscillator, which was created Beforehand and in a same ailment with simulation [11]. As demonstrated in Figure three(b) with red dots and line, the CW output electric power is highly dependent on the position of laser crystal as well as the experimental final result coincides effectively with simulation outcome. As being a note, multimode operation happened in experiment when the dimensions with the pump beam is larger sized than TEM00 cavity mode and it causes larger CW output electrical power from the displacement location underneath three.five mm.
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On the other hand, once Nd3+:YAG turned commercially offered, the interest in CaWO4 dropped sharply. In afterwards many years, particular other tungstate crystals began to bring in loads of interest.
The thermal conductivity of prevalent double tungstates is with the get to three–4 W/(K m) �?which is not poor as opposed with other laser crystals (Despite the fact that various times less than for YAG), and reasonably significant in comparison While using the thermal conductivity of usual glasses.
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Concurrently, a shorter laser wavelength can be attained; it is possible to function using a quantum defect nicely beneath one%. To be a consequence, the warmth technology could be so small that this partly compensates the decrease thermal conductivity.