Yb:CALGO
Our Yb:CALGO crystal, or ytterbium calcium gadolinium aluminum oxide with formula Yb³⁺:CaGdAlO₄, is a laser-gain crystal with good overall performance. Yb:CALGO is used in high-power and ultrashort femtosecond lasers, and Yb-doped CaGdAlO₄ has shown excellent performance for high-power, ultrashort pulses. Its thermal, spectral and mechanical properties support efficient, safe generation of short-duration continuous-wave radiation and ultrafast pulses. Excellent thermo-optic properties and high conversion efficiency enable high-power operation, while a high nonlinear coefficient benefits optimization of mode-locked lasers. Its ultrabroad, flat-top emission band supports complex structured light with excellent tunability. Main features include a high absorption coefficient at 979 nm, a high stimulated-emission cross section, a low laser threshold, an extremely low quantum defect, a broad 994–1050 nm emission spectrum and high slope efficiency under diode pumping. Yb³⁺:CaGdAlO4 has recently attracted interest for diode-pumped short-pulse mode-locked lasers. Unlike Ti:sapphire crystals, which have been used since the early 90s in ultrashort laser systems using chirped-pulse amplification for very short, intense pulses and require green-laser pumping, Yb:CALGO can be pumped directly by efficient, high-power semiconductor lasers.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Doping concentration | 1-10% |
| Parallelism | 10〞 |
| Perpendicularity | 10ˊ |
| Surface Quality | 20/10 |
| Surface Flatness [@632.8nm] | <λ/10@632.8nm |
| Clear Aperture Dimension | >90% |
| Chamfer [@45°] | 0.1mm@45° |
| Thickness / Diameter Tolerance | ±0.05 mm |
| Chemical formula | Yb:CaGdAlO₄ (Yb:CALGO) |
| Crystal Structure | Tetragonal crystal system with a K₂NiF₄-type structure |
| Melting point | 1840°C |
| Thermal conductivity | 6.3(2% Yb:CALGO) |
| Thermal conductivity | 5(5% Yb:CALGO) |
| Thermal shock resistance | >4.5 W.m⁻¹ / 2 |
| Thermal expansion rate | 35 10⁻⁶·K⁻¹ |
| Emission bandwidth *（FWHM） | 80 nm |
| Emission wavelength | 1018-1052 nm |
| Minimum theoretical duration | 14 fs |
| Central emission peak | 1050 nm |
| Absorption (usual pumping) | 980 nm |
| Emission cross section | 0.8 10-20 cm2 |
| Fluorescence lifetime | 420 μs |
| Quantum defect | <0.8% |
Key Features
Datasheet
Supplier Information
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