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 n_e: 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.

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