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    Tm:YLF
    Product Information :

     

    Tm:YLF is the important middle infrared laser crystal. Because Tm:YLF is negative uniaxial crystal, whose thermal refractive index coefficient is negative, some thermal distortion may be counteracted and high-quality light can be output. Conveniently pumped at 792nm, 1.9μm linearly polarized beam is output in a axis, and non-linearly polarized beam is output in c axis.

    Advantages of Tm:YLF Crystals

    Linearly polarized output beam

    Little heat effect while laser

    Effective cross relaxing of Tm ions

    Relatively high efficiency with LD pumping

    Specifications

    Dopant concentration

    Tm: 0~5at%

    Upon request of customer

    Orientation

    [100] or [001] within 5°

    Wavefront distortion

    ≤0.25λ/25mm @632.8nm

    Rod sizes

    Diameter 3~9.5mm, Length 5~120mm
    Upon request of customer (rod or slab)

    Dimensional tolerances

    Diameter:+0.00/-0.05mm,Length: ± 0.5mm

    Barrel finish

    Ground or polished

    Parallelism

    ≤10"

    Perpendicularity

    ≤5′

    Flatness

    ≤ λ/10@632.8nm

    Surface quality

    10-5 (MIL-O-13830A)

    Chamfer

    0.15±0.05mm

    AR coating reflectivity

    ≤0.25%

    Optical and Spectral Properties

    Laser transition

    3F4→3H6

    Laser wavelength

    1.9μm

    Index of refraction

    no=1.443 ne=1.464 @633nm

    no=1.448 ne=1.470 @1064nm

    Physical and Chemical Properties

    Crystal Structure

    Tetragonal

    Melting Point

    825℃

    Moh Hardness

    4-5

    Density

    3.95g/cm3

    Thermal Conductivity

    0.06W/cm/K

    Young's Modulus

    7.5×1011dynes cm-2

    Tensile Strength

    3.3×108dynes cm-2

    Thermal Expansion Coefficient

    [100] Direction:13×10-6/K

    [001] Direction:8×10-6/K




     
     
     
     
     


       
       
     
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