Yb：YAG–1030 nm Laser Crystal Promising Laser-active Material

Short Description:

Yb:YAG is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems. Compared with the commonly used Nd:YAG crsytal, Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-laser level lifetime, three to four times lower thermal loading per unit pump power.

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Product Description

Yb:YAG crystal is expected to replace Nd:YAG crystal for high power diode-pumped lasers and other potential applications.

Yb:YAG shows great promise as a high power laser material. Several applications are being developed in the field of industrial lasers, such as metal cutting and welding. With high quality Yb:YAG now available, additional fields and applications are being explored.

Advantages Of Yb:YAG Crystal

● Very low fractional heating, less than 11%
● Very high slope efficiency
● Broad absorption bands, about 8nm@940nm
● No excited-state absorption or up-conversion
● Conveniently pumped by reliable InGaAs diodes at 940nm (or 970nm)
● High thermal conductivity and large mechanical strength
● High optical quality

Applications

With a wide pump band and excellent emission cross-section Yb:YAG is an ideal crystal for diode pumping.
High Output Power 1.029 1mm
Laser Material for Diode Pumping
Materials Processing, Welding and Cutting

Basic Properties

Chemical Formula	Y3Al5O12:Yb (0.1% to 15% Yb)
Crystal Structure	Cubic
Output Wavelength	1.029 um
Laser Action	3 Level Laser
Emission Lifetime	951 us
Refractive Index	1.8 @ 632 nm
Absorption Bands	930 nm to 945 nm
Pump Wavelength	940 nm
Absorption band about pump wavelength	10 nm
Melting Point	1970°C
Density	4.56 g/cm3
Mohs Hardness	8.5
Lattice Constants	12.01Ä
Thermal Expansion Coefficient	7.8x10-6 /K , [111], 0-250°C
Thermal Conductivity	14 W.s /m /K @ 20°C

Technical Parameters

Product Name	Yb:YAG
Orientation	within 5°
Diameter	3 mm to 10mm
Diameter Tolerance	+0.0 mm/- 0.05 mm
Length	30 mm to 150 mm
Length Tolerance	± 0.75 mm
Perpendicularity of End Faces	5 arc-minutes
Parallelism of End Faces	10 arc-seconds
Flatness	0.1 wave maximum
Surface Finish at 5X	20-10 (scratch & dig)
Barrel Finish	400 grit
End Face Bevel	0.075 mm to 0.12 mm at 45° angle
Chips	No chips allowed on end face of rod; chip having maximum length of 0.3 mm permitted to lie in the area of bevel and barrel surfaces.
Clear aperture	Central 95%
Coatings	Standard coating is AR at 1.029 um with R<0.25% each face. Other coatings available.