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Rare Earth Ions Doped Yttrium Lithium Fluoride (RE: YLF) Laser Crystals - MSE Supplies LLC

Rare Earth Ions Doped Yttrium Lithium Fluoride (RE: YLF) Laser Crystals

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Yttrium Lithium Fluoride (YLF) Laser Crystal crystallizes are in the tetragonal I41/a space group. YLF has several superior properties including high transparency, birefringent (eliminates thermally induced depolarization loss), no absorption loss of sensitized ions, etc. By doping with different materials, the YLF laser crystal can present different properties that can be used for different applications. It is widely used for laser applications, medical diagnosis and treatment, electro-optical countermeasure, material processing, etc.

Technical Data

Crystal Structure Tetragonal, a= 5.16 Å, c= 10.85 Å
Density 3.99 g/cm³
Melting Point 819 ℃ 
Thermal Conductivity

5.3 W/(mK) (a)

7.2 W/(mK) (c)

Thermal Expansion Coefficient

14.3 × 10-6 /ºC (a)

8.4 × 10-6 /ºC (c)

Refractive Index @ 1064 nm

n0: 1.448

ne: 1.470

Size up to 30 mm
Thickness up to 50 mm
Orientation a-cut, c-cut
 Doping Ion Tm Ho Tm, Ho  Yb Pr
Absorption Peak Wavelength  792 nm 1940 nm 792 nm 960 nm 444 nm
Absorption Cross Section 0.55 × 10-20 cm2 1.2 × 10-20 cm2 0.93 × 10-20 cm2 10.5 × 10-21 cm2 8.0 × 10-20 cm2
Fluorescence Lifetime 16 ms 10 ms 8 ms 2.1 ms  50 µs
Laser Wavelength 1900 nm 2060 nm 2065 nm 1017 nm 639 nm
Emission Cross Section 4.0 × 10-21 cm2 1.8 × 10-20 cm2 1.5 × 10-19 cm2 4.1 × 10-21 cm2 2.0 × 10-19 cm2

 

Reference

1. Razumova, I., A. Tkachuk, A. Nikitichev, and D. Mironov. Spectral-luminescent properties of Tm: YLF crystal. Journal of Alloys and Compounds 225, no. 1-2 (1995): 129-132.

2. Rostami, Saeid, Alexander R. Albercht, Mohammad R. Ghasemkhani, Seth D. Melgaard, Aram Gragossian, Mauro Tonelli, and Mansoor Sheik-Bahae. Optical refrigeration of Tm: YLF and Ho: YLF crystals. In Optical and Electronic Cooling of Solids, vol. 9765, pp. 80-85. SPIE, 2016.