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Er:Yb:YAB - Er, Yb Co-doped Yttrium Aluminum Borate

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Er:Yb:YAB - Er, Yb Co-doped Yttrium Aluminum Borate
20170718075547
  • Er:Yb:YAB - Er, Yb Co-doped Yttrium Aluminum Borate

  • Er:Yb:YAl3(BO3)4 crystal has been considered as an excellent 1.55 µm laser material, because it has high thermal conductivity, high Er3+/Yb3+ energy transfer efficiency and weak upconversion loss.
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Introduction

At present, Er3+ / Yb3+ Co-doped Yttrium Aluminum Borate (Er:Yb:YAl3(BO3)4, Er:Yb:YAB) crystal has been considered as an excellent 1.55 µm laser material, because it has high thermal conductivity, high Er3+/Yb3+ energy transfer efficiency and weak upconversion loss. Compared with Er3+/Yb3+ co-doped phosphato glass, Er:Yb:YAl3(BO3)4 crystal can achieve 1530 nm continuous laser output with high (maximum) power and high slope efficiency. Due to the strong penetration ability to smoke, excellent transparency in atmosphere and high sensitivity for the room-temperature Ge as well as InGaAs photodiodes, eye-safe 1.55 µm laser can be widely used in many applications, such as LiDAR laser ranging, three-dimensional imaging and target recognition.

 

Table 1. Basic Properties

Chemical Formula

Er:Yb:YAl3(BO3)4

Crystal Structure

D37 - R32, a = b = 9.293 Å, c = 7.245 Å

Atomic Density

0.55 × 1020 cm-3 (1at.% Yb3+ or Er3+)

Mohs Hardness

7.5 Mohs

Density

3.7 g/cm3

Refractive Index

1.75 (no); 1.68 (ne) @1550 nm

Thermal Expansion Coefficient

⊥c: 2.0×10-6  K-1 // c: 9.7×10-6  K-1 (25 at.% Yb3+)

⊥c: 1.2×10-6 K-1 // c: 8.5×10-6 K-1 (10 at.% Yb3+)

Conductivity

4.7 W/m/K

 

                                          Table 2. Performance Parameter Table

 

Er:Yb:YAl3(BO3)4

Er3+/Yb3+ co-doped phosphate glass

Pumping Wavelength

976 nm

976 nm

Peak Absorption Cross-section

3 × 10-20 cm2 (σ polarization)

1 × 10-20 cm2

FWHM of Absorption Band

19 nm

10 nm

Peak Fluorescence Wavelength

1530 nm

1533 nm

Central Wavelength of Luminescence

470 nm

470 nm

Peak Emission Cross-section

2 × 10-20 cm2 (σ polarization)

0.8 × 10-20 cm2

Fluorescence Lifetime

0.3 ms

8 ms

Refraction Index

1.75 (no)

1.54

Conductivity

4.7 W/m/K

0.8 W/m/K

Maximum Output Power

>1 W

350 mW

Maximum Slope Efficiency

>30%

>30 %

Lasing Wavelength

1520-1600 nm

1528-1565 nm

 

Specifications of Er:Yb:YAB crystal from CASTECH

Table 3. Specifications

Dopant Concentration

Er3+: 0.1~3 at.%, Yb3+: 5~30 at.%

Cross-section

(1 × 1) ~ (15 × 15) mm2

Thickness

0.5~10 mm

Dimension Tolerance

± 0.1 mm

Surface Quality (Scratch / Dig)

10/5 to MIL-PRF-13830B

Transmitted Wavefront Distortion

 λ/8 @633 nm

Flatness

 λ/6 @633 nm

Parallelism

≦ 30 arc sec

Coating

AR- or HR- coating

 

* We can also provide you Er:Yb:GdAl3(BO3)4 and Er:Yb:LuAl3(BO3)4 with similar tech specs above.

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