CY2256 Ytterbium-doped Potassium-Gadolinium Tungstate Crystal (Yb:KGW)

Catalog No.	CY2256
Crystal Structure	Tetragonal
Perpendicularity	<5"
Protective Chamfer	<0.1 mm at 45˚
Lattice Constants	a=5.16Å; c=10.85Å

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CY2256 Ytterbium-doped Potassium-Gadolinium Tungstate Crystal (Yb:KGW)

Description

Specification

Description of Ytterbium-doped Potassium-Gadolinium Tungstate Crystal

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 a high-power diode-pumped laser system. Yb: KGW also has great potential for high power, short pulse time femtosecond lasers, and their wide application.

Advantages of Yb: KGW

- The width of the absorption line is wide, and the pump wavelength of the LD pump source with phase matching can be obtained without strict temperature control;
- 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;
- 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;
- No excitation state absorption and upconversion, high light conversion efficiency;
- Long fluorescence life, more than three times that of the same neodymium-doped laser material, is conducive to energy storage;

Specifications of Ytterbium-doped Potassium-Gadolinium Tungstate Crystal

Material specifications
Chemical formula	potassium gadolinium tungstate
Crystal structure	monoclinic double tungstates
Density	7.27 g/cm3
Transmission range	0.35-5.5 μm
Mohs hardness	4 to 5
Refractive indices at 1060 nm	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
Thermal optical 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 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
Lasing threshold	35 mW
Stark levels energy (in cm-1) of the 2F5/2 manifolds of Yb3+ @ 77 K	10682, 10471, 10188
Stark levels energy (in cm-1) of the 2F7/2 manifolds of Yb3+ @ 77K	535, 385, 163, 0
optical damage threshold, GW/cm2	20

Applications of Ytterbium-doped Potassium-Gadolinium Tungstate Crystal

- Nonlinear microscopy
- Oscillators
- Regenerative amplifiers

Package of Ytterbium-doped Potassium-Gadolinium Tungstate Crystal

Engineered for superior thermal and optical performance, our Yb:KGW crystals are ideal for high-power laser applications. Packaged with advanced protective layers for safe global shipping and long-term storage stability.

FAQs

Q1 What are the key properties of Yb:KGW crystals?

Wavelength Range: Typically operates around 1.03 µm.
High Efficiency: Exceptional energy conversion rates.
Thermal Stability: Excellent thermal conductivity and low thermal lensing.
Broad Absorption Band: Ideal for diode pumping.

Q2 Why choose Yb:KGW over other laser crystals?

Yb:KGW offers high thermal conductivity, a low quantum defect, and a broad absorption spectrum, making it highly efficient for diode-pumped laser systems.

Q3 What makes Yb:KGW suitable for ultrafast lasers?

Yb:KGW's broad absorption band and high thermal conductivity make it ideal for generating femtosecond and picosecond pulses in ultrafast laser systems.