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※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
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 |
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
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