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/Nd:YLF Crystal Neodymium-doped yttrium lithium fluoride

Nd:YLF Crystal Neodymium-doped yttrium lithium fluoride

HGO grows Nd:YLF laser crystals using Czochralski technology. Nd3+:YLF crystal is characterized by its long lifetime of 4F3/2 neodymium energy level. Compared to Nd:YAG, the lower thermal conductivity and a weak negative dn/dT lead to lower thermal distortions and allow to achieve a better output beam quality. Another distinctive feature is the high UV transparency, which is favorable for pumping with xenon flash lamps.

  • Product Origin:

    China
  • Shipping Port:

    Fuzou, Chian
  • Lead Time:

    4weeks
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  • Product Detail

Descriptions:


HGO grows Nd:YLF laser crystals. Compared to Nd:YAG, the lower thermal conductivity and a weak negative dn/dT lead to lower thermal distortions and allow to achieve a better output beam quality.



Optical properties of Nd:YLF crystal

Transparency Range

180-6700nm

Absorption peak wavelength

792 nm

Peak Absorption Coefficientfor 1.2% Nd

α= 10.8cm-1 (792.0 nm Ec)
α= 3.59cm-1 (797.0 nm Ec)

Absorption bandwidth at peak wavelength

~5 nm

Peak Stimulated Emission Cross Section

1.8×10-19/cm2(Ec) at 1047nm
1.2×10-19/cm2(Ec) at 1053nm

Spontaneous Fluorescence Lifetime

485 µs for 1% Nd doping

Scatter Losses

<0.2%/cm

Laser Wavelength

1047nm (c, a-cut crystal)
1053nm(c, a or c-cut crystal)


Physical properties of Nd:YLF crystal

Chemical Formula

LiY 1.0-x Nd x F4

Space Group

I41/a

Nd atoms/cm3

1.40 X 1020 atoms/cm3 for 1% Nd doping

Modulus of Elasticity

85 GPa

Crystal Structure

Tetragonal

Cell Parameters

a=5.16 Å , c=10.85 Å

Melting Point

819

Mohs Hardness

4~5

Density

3.99 g/cm3

Thermal Conductivity

0.063 W/cm/K

Specific Heat

0.79 J/g/K

Thermal Expansion Coefficients

8.3×10-6/kc
13.3×10-6/ kc

dn/dT

-4,6 × 10-6 (||c) K-1, -6,6 × 10-6 (||a) K-1


HGO offers NdYLF specifications:

Doping(atm%):

0.01% ~ 3%

Orientation:

A-cut or C-cut

Wavefront Distortion:

λ/8 per inch @ 632.8 nm

Dimension Tolerances

rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm

Surface Quality:

10/5 Scratch/Dig MIL-O-1380A

Parallelism:

< 10

Perpendicularity:

< 5

Clear Aperture:

> 90%

Surface Flatness:

< λ/10 @ 632.8 nm

Chamfer:

< 0.1 mm @ 45°

Barrel Finish

50-80 micro-inch (RMS) ,

Size

Upon customer request

Coating

AR/HR/PR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use

Other YLF-based Pr/Ho/Tm/Yb/Er/Ce YLF are also available upon request.

Advantages:

1) High power, low beam divergence, effective single mode operation

2) High average power Q-switching at a moderate repetition rate

3) Linear polarized resonators for Q-switching and frequency doubling

4) Potential uniform mode for large diameter rods or slabs

5) Stimulated emission cross section is favorable for low CW threshold

6) 1053nm output of Nd:YLF matches gain curves of Nd:Glass and performs well as an oscillator and pre-amplifier for this host


Why Choose HGO ?

HG OPTRONICS.,INC. grow YLF-based crystals in house using CZ growth technology. The use of high quality starting materials for crystal growth, whole boule interferometry, precise inspection of scattering particle in crystal using He-Ne laser and delicated measurement of bulk losses using spectrophotometer assures that each crystal will comply with customer’s specification and perform well.

And base on our diffusion bonding technology various YLF-based configurations are availabl to supply, especially in the form of YLF/NdYLF diffusion bonding.



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