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Er,Yb:YAB crystals

※Uniaxial crystal with trigonal structure
※High thermal conductivity
※Wide absorption bandwidth near 976 nm
※High absorption and emission cross-sections
※Extremely high Yb3+ to Er3+ energy transfer efficiency

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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 up-conversion loss.It is an alternative to commonly used Er,Yb:phosphate glass as an active medium of “eye-safe” (1,5-1,6 µm) lasers with a high average output power in CW and pulsed modes. It is characterized by high thermal conductivities of 7,7 Wm-1K-1 and 6 Wm-1K-1 along a-axis and c-axis, respectively.

It also features a highly effective Yb3+ to Er3+ energy transfer (~94%) and weak up-conversion losses due to the very short lifetime of 4I11/2 excited state (~80 ns) facilitated by high maximum phonon energy of the host material (hvmax ~1500 cm-1). A strong and wide (~17 nm) absorption band is observed at 976 nm that coincides with the emission spectrum of InGaAs laser diodes.

Features:

Uniaxial crystal with trigonal structure

High thermal conductivity

Wide absorption bandwidth near 976 nm

High absorption and emission cross-sections

Extremely high Yb3+ to Er3+ energy transfer efficiency

Applications:

High power eye-safe (~1,5 μm) CW lasers for metrology

High-repetition rate passively Q-switched lasers for LIDAR and LIBS systems

Ultrashort mode-locked lasers for telecom systems 

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 (1.1at.%  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 (30 at.% Yb3+)

Conductivity

4.7 W/m/K

Pumping Wavelength

976 nm

Peak Absorption Cross-section

3 × 10-20 cm2 (σ polarization)

FWHM of Absorption Band

19 nm

Peak Fluorescence Wavelength

1530 nm

Central Wavelength of Luminescence

470 nm

Peak Emission Cross-section

2 × 10-20 cm2 (σ polarization)

Fluorescence Lifetime

0.3 ms

Refraction Index

1.75 (no)

Conductivity

4.7 W/m/K

Maximum Output Power

1 W

Maximum Slope Efficiency

30%

Lasing Wavelength

1520-1600 nm

Dopant Concentration

Yb-12 at.%,Er-1.5 at.%; Yb-30 at.%,Er-1.1 at.%

Cross-section

3 × 3 mm2

Thickness

10 mm

Dimension Tolerance

± 0.1 mm

Surface Quality (Scratch / Dig)

20/10

Transmitted Wavefront Distortion

 λ/8 @632.8nm

Flatness

 λ/6 @632.8 nm

Parallelism

≦ 30 arc sec

 


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Contact: John Jay Woo

Phone: +86-13982280204

E-mail: digco(at)digco-techs(dot)com

Whatsapp:+86-13982280204

Add: No.2339,South Secrion of Tianfu Avenue,Tianfu New Area,Chengdu 610213,China