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    Ho:Tm:YLF
    Product Information :

     

    Ho:Tm:YLF crystal is 2μm laser crystal with Tm ion sensitized. Conveniently pumped at 792nm, 2.05μm linearly polarized beam is output. Working mode is: First, Tm ion absorbs 792nm pump light energy, and transfers the energy to upper laser level of Ho ion by non-radiative transition, then Ho ion emits laser. The advantage of above working mode is simple structure and high efficiency of laser, so it contributes to miniaturization of laser. But the defect is that the crystal must bear higher heat loss, therefore it is unsuitable for high power laser output.

    Advantages of Ho:Tm:YLF Crystals

    Linearly polarized output beam

    Little heat effect while laser

    Conveniently LD pumped

    Suit to miniature compact laser

    Specifications

    Dopant concentration

    Tm:0~10at% Ho:0~3at%

    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

    5I7 →5I8

    Laser wavelength

    2.05μm

    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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