Yb:KGW – Laser Crystal – Gain Medium – Customized Products

Product ID: 6598

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$100

Yb:KGW – Laser Crystal – Gain Medium – Customized Products

Yb3+: KGd(WO4)2 (Yb:KGW) is one of the most promising laser active materials. Yb: KGW crystal is expected to replace Nd: YAG crystal and Yb: YAG crystal in high power diode pumped laser system. Yb:KGW also has great potential for high power, short pulse time femtosecond lasers and their wide application.

Yb3+:KGW has large absorption coefficient, low quantum defect, high absorption and emission cross section

The simple two-level electronic structure of the Yb ion avoids undesired loss processes such as upconversion, excited state absorption, and concentration quenching. Compared to the commonly used Nd: YAG crystal, Yb: KGW crystal has a much larger absorption bandwidth, 3 or 4 times longer emission lifetime in similar hosts with enhanced storage capacity, lower quantum defect and is more suitable for diode pumping than the traditional Nd-doped systems. The smaller Stokes shift reduces heating and increases the laser efficiency. In comparison with other Yb doped laser crystals such as Yb: YAG and Yb:YCOB crystals, Yb:KGW has a much higher (13-17 times) cross-section of absorption, lower quantum defect (~4%), a cross-section of emission that is 9 times higher than Yb: YCOB, and an emission band that is broader than Yb:YAG, a high nonlinear coefficient of refraction, and the highest slope efficiency (87%).

Note:
$100 is a deposit, not the final price of the product. Please contact us for price if needed.

Features
1. The width of absorption line is wide, and the pump wavelength of LD pump source with phase matching can be obtained without strict temperature control;
2. The quantum defect is low, and the pump wavelength is very close to the laser output wavelength, which will lead to a large intrinsic laser slope efficiency, and the quantum efficiency is up to about 90% theoretically;
3. Because the pumped energy level is close to the upper laser level, the thermal load in the material without radiation relaxation is low, which is only one third of that of the same laser material doped with neodymium;
4.  No excitation state absorption and upconversion, high light conversion efficiency;
5. Long fluorescence life, more than three times that of the same neodymium-doped laser material, is conducive to energy storage;

Physical and Chemical Properties

Chemical Formula Yb3+：KGd（WO4）2
Crystal Structure Monoclinic Double Tungstate
Density 7.27 g/cm3
Transmission Range 0.35-5.5 μm
Mohs Hardness 4 to 5
1060 nm Refractive Index ng = 2.037,
np = 1.986,
nm= 2.033

Optical and Thermal Properties

Thermal Conductivity Ka=2.6 W/mK,
Kb=3.8 W/mK,
Kc=3.4 W/mK
Thermo-optic Coefficient@ 1064 nm dnp/dT=-15.7 * 10-6 K-1
dnm/dT=-11.8 * 10-6 K-1
dng/dT=-17.3 * 10-6 K-1
Thermal Expansion αa=4X10-6 /°C
αb=3.6X10-6 /°C
αc=8.5X10-6 /°C
Melting Point Temperature 1075 °C
Absorption Cross Section 1.2X10-19 cm2
Stimulated Emission Cross Section（E || a） 2.6X10-20 cm2
Laser Wavelength 1023-1060 nm
Laser Threshold 35 mW
Yb3 +的2F5/2Pure energy level of the manifold at 77 K（cm-1） 10682, 10471, 10188
The Stark level of the 2F7/2 manifold of Yb3+ in cm-1 at 77K 535, 385, 163, 0
Optical damage threshold, GW/cm2 20

Spectral properties

Absorption Peak Wavelength，lpump，[nm] 981.2
Absorption Line Width，Dlpump，[nm] 3.7
Peak Absorption Cross Section, Bubbling，[cm2] 1.2×10-19
Peak Absorption Coefficient，[cm-1] 26
Emission Wavelength，lse，[nm] 1023
Emission Line Width，Dlse，[nm] 20
Peak Emission Cross Section，sse，[cm2] 2.8×10-20
Quantum Effect，lpump / lse，[nm] 0.959
Fluorescence Lifetime，tem [ms] 0.6

 

Absorption and Emission Spectra

TaorLab laser crystals

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