Yb:CALGO

Yb:CALGO
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Yb:CALGO crystal product, also known as ytterbium calcium aluminum gadolinium oxide crystal, with the chemical formula of Yb3+:CaGdAlO4. It is a laser gain crystal with good comprehensive performance.

The Yb-doped crystal is used by CALGO for high-power and ultra-short (femtosecond) lasers. It shows that the Yb-doped CaGdAlO4 crystal has an excellent performance in producing high-power and ultra-short laser pulses.

This crystal has remarkable thermal, spectroscopic, and mechanical properties and can efficiently and safely generate short-duration continuous wave radiation and ultrafast pulses. More specifically, its excellent thermo optical characteristics and high conversion efficiency allow high-power operation. Its high nonlinear coefficient helps optimize the research of mode-locked lasers.

In addition, its ultra-wide and flat-top emission band is conducive to generating complex structured light with excellent adjustability.

Main Characteristics of Yb: CALGO:

  • The high absorption coefficient at 979 nm
  • High excited emission cross-section
  • Low laser threshold
  • Extremely low quantum defects
  • A wide emission spectrum of 994 – 1050 nm
  • The high slope efficiency of diode pumping

It has recently been found that Yb3+:CaGdAlO4 is very interesting for developing diode-pumped short-pulse mode-locked lasers.

Compared with Ti: sapphire crystal (since the early 1990s, the ultrashort laser system developed by using chirped pulse amplification technology can produce very short and powerful pulses), Yb: CALGO can directly pump semiconductor lasers (green laser pumped Ti: sapphire crystal) with very high efficiency and high power.

  • High thermal conductivity
  • Big gain bandwidth
  • Broad and smooth launch of bandwidth
  • Low temperature gradient refractive index
  • High power InGaAs laser diode cover absorption band

Material Specifications

Doping Concentration1-10%
Parallelism10〞
Vertical10ˊ
Surface Quality20/10
Surface Flatness<λ/10@632.8nm
Clear Aperture>90%
Chamfering0.1mm@45°
Thickness/Diameter Tolerance±0.05 mm

Physical and Chemical Properties

Chemical FormulaYb:CaGdAlO4  (Yb:CALGO)
Crystal StructureTetragonal Crystal SystemK2NiF4 Type Structure
Melting Point1840°C
Thermal Conductivity/（W·m-1·K-1）11.4(Without Doping)
6.3(2% Yb:CALGO)
5(5% Yb:CALGO)
Thermal Shock Resistance（W.m-1 / 2）>4.5
Thermal Expansion Rate/（10-6·K-1）35

Optical and Spectral Properties

Transmit Bandwidth*（FWHM）（nm）80
Emission Wavelength（nm）1018-1052
Minimum Theoretical Duration（fs）14
Central Emission Peak（nm）1050
Absorption (Usually Pumped)（nm）980
Emission Cross Section（10-20 cm2）0.8
Fluorescence Lifetime（μs）420
σemτ（μscm2）336
Quantum Defect<0.8%

Main Properties of Laser Materials Involved in Femtosecond Laser Development

MaterialTransmit Bandwidth（FWHM）（nm）Minimum Theoretical Duration（fs）Central Emission PeakAbsorption（Usually Pumped）（nm）
Yb:YAG91241031942
Yb:Glass35311020975
Yb:GdCOB44261044976
Yb:BOYS60181025975
Yb:KGW25441023981
Yb:KYW24461025981
Yb:SYS73161040979
Yb:YVO430361008984
Yb:CaF230361047980
Yb:CALGO80141050980

Absorption and Emission Spectra

Yb CALGO laser crystal emission spectrum CRYLINKYb CALGO laser crystal absorption spectrum CRYLINK

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