The KYW Crystal Diaries
The KYW Crystal Diaries
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The Yb-doped potassium yttrium tungstate (Yb:KYW) crystal, compared to its counterpart Yb:KGW, is often a remarkable materials that plays a significant part in laser technological know-how. Its Main operate will be to generate ultrashort pulses of sunshine, spanning just a couple hundred femtoseconds.
We present a dual-crystal Yb:KGW laserthat iscapable to function for a Q-switched oscillator with output electrical power nearly 24 W and pulse length of twenty ns,or as being a regenerative amplifier with output electrical power as many as 21 W and pulse period beneath 200 fs soon after compression of chirped pulses. Both equally lasers have fantastic beam high-quality with beam parameter M2
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Optical layout of the laser with immediate pumping with the radiation of semiconductor injection lasers. LD is an IPG Photonics laser diode with fiber output of the radiation, WP is a 50 %-wave plate, CL is really a collimating lens, FL is really a concentrating lens, AE can be an Lively aspect created from an Yb:KYW crystal, DM is really a spherical dichroic mirror, M1-M6 are classified as the cavity mirrors, OC would be the output mirror, and SAM is really a semiconductor saturable-absorber mirror.
The monoclinic crystal structures leads to a purely natural birefringence, assisting to prevent thermally induced polarization rotation and click here depolarization loss.
FIG. one. Optical layout of the laser with direct pumping With all the radiation of semiconductor injection lasers. LD is undoubtedly an IPG Photonics laser diode with fiber output
Spatial composition of the beam and also the corresponding intensity profiles I with the output with the laser.
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On the other hand, the moment Nd3+:YAG became commercially available, the desire in CaWO4 dropped sharply. In later on many years, certain other tungstate crystals began to draw in plenty of focus.
The thermal conductivity of widespread double tungstates is of your buy to three–4 W/(K m) �?which is not poor compared with other laser crystals (While several occasions lower than for YAG), and pretty huge in comparison With all the thermal conductivity of typical Eyeglasses.
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At the same time, a shorter laser wavelength is usually attained; it can be done to function that has a quantum defect perfectly down below one%. For a consequence, the warmth technology is often so smaller that this partly compensates the reduce thermal conductivity.