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Nd:KGW - Neodymium Doped Potassium Gadolinium Tungstate

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Nd:KGW - Neodymium Doped Potassium Gadolinium Tungstate
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  • Nd:KGW - Neodymium Doped Potassium Gadolinium Tungstate

  • Nd:KGW, as an excellent laser crystal, has low laser oscillations threshold, high emmission section and high doping concentraton for the weakened fluorescent concentration quench effect of the Nd3+.
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Introduction

Neodymium doped Potassium Gadolinium Tungstate (Nd:KGd(WO4)2 or Nd:KGW) is an excellent laser gain material which has low laser oscillations threshold and high emission section. The fluorescent  concentration quench effect of the Nd3+ ion in the KGW crystal may be weakened due to the W-O covalent bond, so this crystal has a higher doping concentration of active ion. Furthermore, the absorption band at 808 nm of Nd3+ in the KGW which has 12 nm FWHM is well matched with the emission wavelength of current commercial laser diode.

 

Table 1. Basic Properties

Crystal Structure

monoclinic

Space Group

C2h (2/c) - C2/c

Lattice Parameter

a = 8.087 Å, b = 10.374 Å, c = 7.588 Å

β = 94.41°

Refractive Index, at 1067 nm

ng = 2.049, np = 1.978, nm = 2.014

Mohs Hardness

5

Density

7.27 g/cm3

Melting Point

1075℃

Thermal Conductivity at 373 K

K[100] = 0.026 W/cm/K

K[010] = 0.038 W/cm/K

K[001] = 0.034 W/cm/K

Young's Modulus

E[100] = 115.8 Gpa, E[010] = 152.5 GPa,

E[001] = 92.4 Gpa

Thermal Expansion Coefficient, at 373℃

α[100]  = 4×10-6 /K, α[010]  = 1.6×10-6 /K, α[001]  = 8.5×10-6 /K

Lasing Wavelength

911 nm, 1067 nm, 1351 nm

Absorption Band 

808 nm (FWHM 12 nm)

Fluorescent Lifetime

110 µs (30% doping), 90 µs (8% doping)

 

 Table 2. Laser Properties

3% Nd:KGW

Emission Wavelength

1070 nm

Emission Bandwidth

15 nm

Stimulated Emission Cross-section σe

1.48 × 10-20 cm2

Fluorescent Lifetime 

109 µs

Gain Bandwidth

15 nm

Absorption Wavelength

810 nm

Absorption Bandwidth

14 nm

Absorption Cross-section σα

1.28 × 10-20 cm2

 

 Specifications of Nd:KGW crystal from CASTECH

Table 3. Specifications of Nd:KGW

Orientation

[010]

Standard Dopant Concentration

Nd: 3%, 5%, 8% atm%

Maximum Length

50 mm

Dimensional Tolerances

Diameter: ±0.1mm 

Length: ±0.5 mm

Surface Quality (Scratch/Dig)

20/10 to MIL-PRF-13830B

Flatness

 λ/6 @633 nm

Parallelism

20 arc sec

Perpendicularity

≦ 15 arc min

Coating

AR-coated

 

                           

Figure 1. Transparency curve of  Nd:KGW

 

Figure 2. Emission spectra of 3%Nd:KGW

 

Figure 3. Absorption spectra of 3%Nd:KGW

 

 

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