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Yb:YAG - Ytterbium Doped Yttrium Aluminum Garnet

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Yb:YAG - Ytterbium Doped Yttrium Aluminum Garnet
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  • Yb:YAG - Ytterbium Doped Yttrium Aluminum Garnet

  • Yb:YAG is an important laser-active material. Compared with Nd:YAG, Yb:YAG has a much larger absorption, a longer upper-laser level lifetime, 3 to 4 times lower thermal loading per unit pump power.
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Introduction

Ytterbium Doped Yttrium Aluminum Garnet (Yb:Y3Al5O12, 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 crystal, 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. Yb:YAG crystal at 1030 nm is a good substitute for a Nd: YAG crystal at 1064 nm and its second harmonic at 515 nm may replace Ar-ion laser (with a large volume), which emit at 514 nm.

 

CASTECH's Yb:YAG Crystal is featured by

       •  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 940 nm(or 970 nm) 
       •  High thermal conductivity and large mechanical strength
       •  High optical quality

 

Table 1. Optical and Spectral Properties of Yb: YAG Crystal

Laser Transition

2F5/22F7/2

Laser Wavelength

1030 nm

Photon Energy

1.93 × 10-19 J (@1030 nm)

Emission Linewidth

9 nm

Emission Cross Section

2.0 × 10-20 cm2

Fluorescence Lifetime

1.2 ms

Diode Pump Band

940 nm or 970 nm

Pump Absorption Band Width

8 nm

Index of Refraction

1.82

Thermal Optical Coefficient

9 × 10-6 /℃

Loss Coefficient

0.003 cm-1

 

Specifications of Yb: YAG crystal from CASTECH

 Table 2. Material and Specifications

Dopant Concentration

Yb: 5~15 at%

Rod Sizes

Diameter: 2~20 mm, Length: 5~150 mm

Upon request of customer

Dimensional Tolerances

Diameter: ±0.1mm 

Length: ±0.5 mm

Surface Quality

10/5 to MIL-PRF-13830B

Wavefront Distortion

< λ/8 @633 nm

Flatness

λ/8 @633 nm

Parallelism

20 arc sec

Perpendicularity

≦ 15 arc min 

Extinction Ratio

≧ 28 dB

Barrel Finish

Ground Finish: 400#Grit

Chamfer

≦ 0.2 mm × 45° 

AR Coating Reflectivity

AR-1030/940 nm, R < 0.2% @1030 nm, R < 0.5% @940 nm.

Other coatings are available upon request.

Single Pass Loss

< 3 × 10-3 cm-1

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