Er:Yb:Glass (Erbium-doped Glass)
Keywords:
Scintillation Crystals
- Product Introduction
- Key advantages
- Application areas
- Product Features
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- Commodity name: Er:Yb:Glass (Erbium-doped Glass)
Er:Yb:glass (erbium glass) is a well-known and widely used active medium—a phosphate glass co-doped with erbium (Er³⁺) and ytterbium (Yb³⁺)—employed for lasers emitting in the eye-safe 1.5–1.6 µm wavelength range.
Product Introduction
Er:Yb:glass (erbium glass) is a well-known and widely used active medium—a phosphate glass co-doped with erbium (Er³⁺) and ytterbium (Yb³⁺)—employed for lasers emitting in the eye-safe 1.5–1.6 µm wavelength range.
Er:Yb:Glass (Erbium-Ytterbium co-doped phosphate glass) is a rare-earth-doped laser material based on a phosphate glass matrix. It boasts a long fluorescence lifetime and is relatively safe for human eyes. As an eye-safe wavelength laser, the Er3+/Yb3+-co-doped phosphate glass laser has garnered significant attention due to its compact design and cost-effectiveness—particularly in applications like laser generation and signal amplification. The 1540 nm wavelength happens to fall precisely within both the eye-safe range and the optical fiber communication window. This material is widely used in laser ranging and tracking, fiber-optic communications, optoelectronic countermeasures, high-power laser damage applications, laser-based medical treatments, and laser cosmetic procedures. It also excels in optical waveguide amplification and offers high-gain characteristics when employed in fiber amplifiers.
Key Advantages
- High laser efficiency
- Low laser threshold
- Eye-safe
- Low power loss
- Energy transfer efficiency from high-Yb to Er
- Long fluorescence lifetimeApplication Areas
- Military individual long-range targeting, tank and armored vehicle targeting
- Drone micro-pod, missile laser guidance
- Laser ranging and tracking
- Laser medical treatments and laser beauty procedures
- Fiber-optic communicationProduct Features
Material Properties
Erbium Glass Properties
Erbium Glass Specifications
EAT14
WM4
The Cross-section for Stimulated Emission
0.8 10-20 cm²
0.75 10-20 cm²
Density
3.06 g/cm³
2.83 g/cm³
Melting Point
1970 °C
1970 °C
Thermal Expansion Coefficient (20–100°C)
87 10-7/K
82 10-7/K
Thermal Expansion Coefficient (100–300°C)
95 10-7/K
96 10-7/K
Thermal Coefficient of Optical Path Length (20 –100°C)
2.9 10-6/K
1.4 10-6 /K
Thermal Conductivity (25°C)
0.7 W/m·K
0.7 W/m·K
Central Laser Wavelength
1535 nm
1535 nm
Refractive Index
1.524@1535 nm
1.528@1535 nm
Refractive Index
1.532@589.3 nm
1.536@589.3 nm
Abbe Number
66
66
Softening Temperature
605 °C
573 °C
Transition Temperature
556 °C
530 °C
Fluorescence Lifetime
7.7– 8.0 ms
7.7– 8.2 ms
Product Processing Indicators
Orientation Tolerance
<0.5°
Effective Aperture
>90%
Maximum Size
∅(3 –12.7)×(3 –150) mm²
Dimensional Tolerance
±0.05 mm
Chamfer
≤0.2×45°
Surface Quality
10-5 S-D
Flatness
≤λ/8@632.8 nm
Wavefront Distortion
≤λ/4@632.8 nm
Parallelism
<10"
Perpendicularity
≤15′
Chipped Edge
<0.1 mm
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- Excellent thermal conductivity
- Multiple possible pump wavelengths (typically 532 nm)
- Broad-wavelength tunability
- Broadly Absorbing Pump Band
- Outstanding output efficiency
- Short-lived excited state (3.2 μm)
- Narrow mode-locking width
- High damage threshold -
- Mode-locked laser with ultrashort pulses
- Multi-channel Amplifiers and Regenerative Amplifiers
- The tunable wavelength range allows Ti:Sapphire lasers to replace dye lasers in many applications.
- By using ultra-thin, non-critically phase-matched crystals like BBO as frequency-doubling devices, Ti:Sapphire lasers can generate ultrashort pulses as short as below 10 fs, producing light in the ultraviolet to deep-ultraviolet range—down to as low as 193 nm.
-Ti:Sapphire is also widely used as a pump source for optical parametric oscillators to broaden their tuning range. -
Basic Material Properties Molecular formula Ti³⁺:Al₂O₃ Crystal structure Hexagonal crystal system Lattice constant a = 4.758 Å, c = 12.991 Å Density 3.98g/cm3 Melting point 2040°C Mohs Hardness 9Mohs Thermal conductivity 52W/m/k Specific heat 0.42J/g/K Laser generation Four-level system Fluorescence lifetime 3.2 μs (T = 300 K) Tuning range 660-1050nm Absorption range 400-600nm Emission peak 795nm Absorption peak 488nm Refractive index 1.76 @ 800 nm Peak cross-section 3–4 × 10⁻¹⁹ cm² Coefficient of thermal expansion 8.40 × 10⁻⁶/°C Product Processing Metrics Directional The C-axis is the optical axis direction, which is perpendicular to the crystal surface. Ti2O3 concentration 0.06–0.26 at.% Quality factor 100–300 units Effective Aperture >90% Surface Dimension Tolerance 0 / -0.1 mm Thickness Tolerance ±0.1 mm Protective Chamfer ≤0.2 × 45° End face Double parallel planes or Brewster-cut ends Surface finish 10-5 S-D Flatness ≤λ/8 @ 633 nm Transmitted Wavefront Distortion ≤λ/4 @ 633 nm Parallelism 30" Verticality ≤15′ Custom film system services available
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