Cr:YSO

Cr:YSO

The Cr: Y2SiO5 (Cr:YSO) crystal is an effective saturable absorber Q switch for the ruby laser, the alexandrite laser and the Cr:LiCaAlF (Cr:LiCAF) laser. Some experiments showed the Cr:YSO crystal can also be used to Q-switch the Cr:LiSrAlF (Cr:LiSAF) laser when the laser wavelength is at 880 nm.

Cr:YSO is a pure tetravalent chromium system. The emission lifetime of Cr:YSO is 0.7 ms at room temperature, which is long compared with the duration of the Q-switched laser pulses. Therefore, Cr: YSO can be classified as a slowly relaxing saturable absorber.

Cr:YSO Crystal – Saturable Absorber Passive Q Switch for Cr: LiCAF & Cr:LiSAF Laser

The Cr:YSO can work as a saturable absorber Q switch for the Cr:LiCAF laser near 780 nm, the peak of its tuning range. The theoretical simulation also shows that the Cr:YSO can be used as an effective saturable absorber Q switch for the tunable Cr:LiCAF laser over a major portion of its entire tuning range, from 725 nm to 840 nm. On the other hand, the Cr:YSO had also been experimentally demonstrated to be an effective saturable absorber Q switch for the tunable Cr:LiSAF laser.

Features of Cr: YSO Crystal

  • High refractive index
  • Low sound attenuation
  • High Quality Factor
  • High transparency to visible light
  • Excellent sound and light characteristics

Basic Parameters

属性Value
Chemical FormulaCr:Y2SiO5
ColorBlue
Crystal SystemMonoclinic. biaxial
Lattice Constantsa=10.41Å, b=6.72Å, c=12.49Å, β=102º39’
Cr Atoms/Mole %9.7×1019/cm3
Main Absorption Peaks390 nm. 595 nm. 695 nm and 750 nm
Emission Spectrum1000 nm to 1500 nm(peak at ~ 1250 nm)
Fluorescence Lifetime at 25ºC0.7 μs
Density4.6 g/cm3
Refractive Index1.8
Melting Point
2070ºC

Spectrum

Cr:YS0 Absorption Spectrum
Cr:YSO Absorption Spectrum

References

[1] Numerical study of passive Q switching of a tunable alexandrite laser with a Cr:Y2SiO5 solid-state saturable absorber
[2] Simulation of tunable Cr:YSO Q-switched Cr:LiSAF laser
[3] Tunable Cr4+:YS0 Q-Switched Cr:LiCAF Laser

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