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LiSAF,LiSGaF,LiCAF Laser Crystal

LiSAF (LiSrAIF6), LiSGaF (LiSrGaF6) and LiCAF (LiCaAIF6) are excellent laser materials with high energy storage and high slope efficiency, also ideal working material under conditions of ultra short pulse and ultra high power. Honour Optics provides Ce, Cr and no-doped LiSAF, LiSGaF and LiCAF crystals grown by the Czochralski technique. The use of high quality starting materials for crystal growth and measurement of dopant concentration using absorption spectroscopy assures that each crystal will perform to customer specifications.

Honor optics is a professional high quality LiSAF, LiSGaF and LiCAF laser crystals manufacturer, sell no-doped LiSAF, LiSGaF and LiCAF crystals, welcome to consult high purity LiSAF, LiSGaF and LiCAF laser crystals optimal price.

Laser crystal Dopant Wavelength(nm)
LiSAF Cr.

Ce.

780-1060nm

280-320nm

LiCAF Cr.

Ce.

700-900nm

270-315nm

LiSGaF Cr. 750-950nm

Cerium is the simplest rare earth metal known. The Ce:LiSAF and Ce:LiCAF lasers are categorised as UV diode lasers. Wavelengths produced by these lasers vary from 280 to 316nm. LiSAF is a crystal comprising of lithium, strontium, and aluminium fluoride. LiCAF comprises of lithium, calcium, and aluminium fluoride.

In the Ce:LiSAF laser, cerium is the light emitter, while lithium strontium aluminium fluoride is the crystalline host that preserves the optical characteristics of cerium. The LiSAF crystal, when doped with cerium, behaves as an optical crystal that emits lights of varying wavelengths, thus making it a tunable laser.

Ce:LiCAF is another tunable UV laser, with cerium as the light emitting source, and lithium calcium aluminium fluoride as the crystalline host. Both Ce:LiSAF and Ce:LiCAF exhibit strong energy absorption and broad tenability. Of the two lasers, Ce:LiCAF has better tunability and spectroscopic properties.

Cr:LiSAF, typical one of the Cr-doped colquiriite crystals, is a vibronic laser medium, widely tunable in the near-IR range ~780 nm to 1060 nm, and also able to support pulses with durations of tens of femtoseconds. It has been shown that it is possible to generate pulses as short as 24 fs. Compared with titanium - sapphire lasers, such lasers can be much cheaper, because they use a red rather than a green pump source and can be operated with low pump powers, so that diode pumping is feasible.

LiSAF, LiSGaF and LiCAF laser crystals offer a wide tuning range, and the corresponding lasers can be either lamp pumped or diode pumped. Cr:LiSAF is generally preferred to Cr:LiCAF. Due to the large gain linewidth centered around 850 nm and the possibility of diode pumping with laser diodes at 670 nm wavelength; these media are also attractive for generating femtosecond pulses.

Laser Properties

Laser Properties
Laser type Solid
Pump sources Frequency quadrupled Nd:YAG laser pumped, excimer laser pumped, copper vapor laser pumped
Operating wavelength 280-316nm

Among Cr3+ doped LiCAF, LiSAF and LiSGaF, Cr:LiSAF crystal has a broad gain bandwidth similar like Ti:sapphire crystal, providing wavelength tunability from 780 to 1000 nm and enabling generation of ultrashort pulses. Cr:LiSAF laser has outstanding advantages compared with Ti:sapphire laser, which is likely to be pumped directly by flash lamp or laser diode, and the product of their fluorescence lifetime and emission cross sections is relatively high. Lasing threshold of Cr:LiSAF can be quite low, high slope efficiency and long lifetime.

The Cr:LiSAF also has a long fluorescence lifetime in comparisons’ with that of Ti:sapphire laser crystal, which is beneficial for Q-switched operation. Cr:LiSAF laser crystal is a vibronic laser medium and considered as a homogeneously broadened emission medium. Therefore, the Cr:LiSAF laser medium has been demonstrated to work effectively both in the tunable CW and passively Q-switched or mode locked techniques. wholesale LiSAF, LiSGaF and LiCAF laser crystals

Physical and Chemical Properties

Physical and Chemical Properties
Chemical formula Ce:LiSrAlF6 Ce:LiCaAlF6
Crystal structure Trigonal Trigonal
Melting point 766°C 810°C
Thermal conductivity 3 W/m°C 4.58 W/m°C

Physical Properties:

Chemical Formula: Cr3+:LiSrAlF6
Lattice Parameters(Å): a=5.084, c=10.21
Crystal structure: trigonal
Space Group: P31C
Cr atoms/cm3 for 1% doping: 8.75x10^19
Fracture Toughness(Mpam): 0.40(//c)
Melting Point :766deg. C
Density(g/ cm³) 3.45
Modulus of Elasticity(GPa): 109
Thermal Expansion Coefficient(10^6K):-10(//c), 25(⊥c)
Thermal Conductivity (W/m/K) 3.3(//c), 3.0(⊥c)
Specific Heat(J/gK)(@25deg.C): 0.842

Optical Properties:

Emission Peak: 846nm
Peak Stimulated Emission Cross Section: 4.8×10-20cm2 (//c)
Spontaneous Fluorescence Lifetime: 67 µs
Scatter Losses(%/cm): <0.2
dn/dT(×10-6/K ): -4.8(//c), -2.5(⊥c)

The Sellmeier equations(λ in µm):

nc^2 =1.98448 + 0.00235/(L^2 - 0.010936) - 0.01057 L^2
na^2=1.97673 + 0.00309/(L^2 - 0.00935) - 0.00828 L^2
Cr:LiSAF Crystal:
846nm nc=1.407 na=1.405
670nm nc=1.409 na=1.407
423nm nc=1.413 na=1.412
290nm nc=1.420 na=1.420
266nm nc=1.422 na=1.424

Our general LiSAF, LiSGaF and LiCAF production capabilities and standard specifications include:

Doping concentration from 0.5 to 5.5mol%
Diameter from 2mm to 50.8 mm, length from 1mm to 180mm
Orientation Tolerance: 5 arc minutes
Diameter tolerance:+/-0.05mm
Length tolerance: +/-0.1mm
Dopant Concentration Tolerance: 0.1%
Parallelism: <10 arc seconds
Perpendicularity: <5 arc minutes
Chamfer: 0.1mm @45°
Clear Aperture: 95%
Surface Quality: 10/5 or better
Surface Flatness: λ/10 @ 633nm
Wavefront Distortion: <λ/[email protected]
Coating: As per requirement
Large rod dimensions and non-standard dopant concentrations are available upon request.

Currently, Cr:LiSAF related products such as flashlight pumping and diode pumping laser have been widely used.

The primary application of the Ce:LiSAF and Ce:LiCAF lasers is remote atmospheric monitoring.
Some of the other applications of the Ce:LiSAF and Ce:LiCAF lasers are listed below:
Ozone DIAL measurements
LIDAR
Optics research
Detection of biological weapons in defense
Welcome everyone to wholesale LiSAF, LiSGaF and LiCAF laser crystals.

Honour optics offer high-quality Ce, Cr, and no-doped LiSAF, LiSGaF and LiCAF crystals grown by the czochralski technique. Honor optics is a professional high quality LiSAF, LiSGaF and LiCAF laser crystals manufacturer, sell no-doped LiSAF, LiSGaF and LiCAF crystals, welcome to consult high purity LiSAF, LiSGaF and LiCAF laser crystals optimal price.