KYW Crystal Secrets
KYW Crystal Secrets
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The gain bandwidth e.g. of Yb:KGW and Yb:KYW is quite substantial compared with that of Yb:YAG. This allows for vast wavelength tunability and for Significantly shorter pulse durations from method-locked lasers. Values very well down below one hundred fs are actually achieved with passive manner locking.
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We present a twin-crystal Yb:KGW laserthat iscapable to work to be a Q-switched oscillator with output power as much as 24 W and pulse length of twenty ns,or being a regenerative amplifier with output electric power as many as 21 W and pulse length underneath 200 fs right after compression of chirped pulses. Each lasers have superb beam quality with beam parameter M2
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This paper describes a femtosecond laser regenerative amplifier depending on two Yb:KYW crystals with direct longitudinal pumping by powerful linear arrays of semiconductor injection lasers owning fiber output. To circumvent spectral narrowing through amplification along with the corresponding lengthening with the amplified pulse when it truly is compressed, a combination of two Yb:KYW crystals ended up employed, Using the spectral maxima with the amplification shifted relative to each other and with spectral profiling with the amplified radiation.
Right after air drying and subsequent cleansing using a cotton fabric soaked in alcohol, the film floor confirmed no signs of peeling or scratches.
FIG. 1. Optical structure of a laser with immediate pumping Using the radiation of semiconductor injection lasers. LD can be an IPG Photonics laser diode with fiber output
5 mm in addition to the middle on the beam caustic. As a way to Verify the manner matching simulation, we done the experiment with Ng-Minimize crystal oscillator, which was created Beforehand As well as in a exact same ailment with simulation [11]. As revealed in Figure three(b) with crimson dots and line, the CW output ability is extremely depending on get more info the place of laser crystal and also the experimental final result coincides effectively with simulation final result. Like a Observe, multimode Procedure happened in experiment once the dimensions of the pump beam is greater than TEM00 cavity method and it results in greater CW output electricity during the displacement location below 3.5 mm.
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By substituting yttrium with ytterbium in the crystal lattice of Yb:KYW mainly because of the very similar measurements of these chemical things approximately 100% of Yb-doping may very well be attained.
Although ytterbium-doped laser achieve media commonly show a small quantum defect, ytterbium-doped tungstates enable for specifically tiny values. By way of example, a 1030-nm Yb:YAG laser would Typically be pumped close to 940 nm, Whilst Yb:KGW or Yb:KYW may very well be most successfully pumped all around 981 nm.
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At the same time, a shorter laser wavelength is usually acquired; it is possible to function having a quantum defect very well beneath one%. As being a consequence, the warmth generation might be so small that this partly compensates the lessen thermal conductivity.