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Yb:KGW and Yb:KYW Crystals

One Yb:KGW and one Yb:KYW laser crystal in transparent pink color

Yb:KGW and Yb:KYW Crystals

Yb:KGW doping concentration

0.5-5 atm.%

Yb:KYW doping concentration

0.5-10 atm.%

Aperture dimensions

1×1 – 15×15 mm

Surface quality, S-D


Surface flatness, P-V

<λ/10 @ 632.8 nm

Transmitted wavefront distortion, P-V

up to λ/8 @ 632.8 nm


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Yb:KGW and Yb:KYW – Laser crystals

Yb:KGW and Yb:KYW crystals are used as lasing materials to generate ultrashort high-power pulses. The crystals are typically pumped with diode lasers at around 980 nm due to the maximum absorption band around this wavelength. A broad spectral emission band allows tuning of the laser radiation over the 1020 – 1060 nm range.

Yb:KGW and Yb:KYW crystals have already been used for many years, but their performance strongly depends on where the materials were grown. Altechna works with selected material growers and has established a reliable production chain.

To minimize back reflection and improve pump/ lasing performance, broadband antireflective coatings are applied as a rule for all right-angle cut crystals. Coatings are typically made with e-beam and ion-assisted deposition (IAD). However, sputtering technology could also be used if needed.

As a final touch, full metrology of crystals is carried out in our metrology lab.


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