KGW—KGd(WO₄)₂—Gadolinium potassium tungstate
Key words:
KGW—KGd(WO₄)₂—Gadolinium potassium tungstate
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Product Description
KGW—KGd(WO₄)₂—Gadolinium potassium tungstate
Gadolinium potassium tungstate (KGd(WO₄)₂) crystal has a wide transmission range, good thermal conductivity, high damage threshold, large Raman shift coefficient and high Raman gain, etc. It is a kind of excitation Raman laser crystal with excellent performance, and it can maintain high conversion efficiency and beam quality during the Raman frequency conversion process.KGW crystal is able to withstand high pumping power, and it is suitable for pumping light of various wavelengths.
Introduction
Gadolinium potassium tungstate (KGd(WO4)2) crystal has a wide transmission range, good thermal conductivity, high damage threshold, large Raman shift coefficient and high Raman gain, etc. It is a kind of excitation Raman laser crystal with excellent performance, and it can maintain high conversion efficiency and beam quality during the Raman frequency conversion process.KGW crystal is able to withstand high pumping power, and it is suitable for pumping light of various wavelengths. KGW crystal can withstand high pump power and is suitable for a variety of wavelengths of pump laser, and is widely used in Raman lasers, laser frequency conversion, medical imaging, photodynamic therapy, environmental monitoring, spectroscopy research, material processing and other fields.
Table 1: Basic characteristics
|
Crystal Structure |
Monoclinic |
|
Space Group |
C2/c |
|
Cellular Parameters（Å） |
a=8.09, b=10.43, c=7.58 |
|
Transparency |
0.3~5 μm |
|
Density |
7.27 g/cm3 |
|
Mohs Hardness |
4-5 Mohs |
|
Melting Point |
1087 °C |
|
Phase Inversion Temperature |
1031 °C |
|
Thermal Conductivity |
Ka=2.6 W/m/K Kb=3.8 W/m/K Kc=3.4 W/m/K |
|
De-phasing time |
2 ps |
|
DN/dt |
Dnp/dt=-15.7 x 10-6/K DNm/dt=-11.8 x 10-6/K DNg/dt=-17.3 x 10-6/K |
|
Refractive Index (@1064 nm) |
np=1.982 nm=2.010 ng=2.061 |
Table 2: Raman properties
|
Raman Frequency Shift |
767 cm-1 (p[gg]p) 901 cm-1 (p[mm]p) |
|
Raman Linewidth |
6.4 cm-1@767 cm-1 (p[gg]p) 5.4cm-1@901 cm-1 (p[mm]p) |
|
Raman Gain (ps, transient region) |
11 cm/GW @532 nm 3 cm/GW @1064 nm |
KGW crystal has two large Raman modes related to pump polarization, located at 768 cm ⁻¹ and 901 cm ⁻¹, respectively. This means that when the pump light is irradiated onto the KGW crystal, there will be a frequency shift of Stokes light and anti Stokes light, corresponding to the frequencies of these two Raman modes. This characteristic enables KGW crystals to convert the frequency of pump light to a specific Raman shift frequency, thereby achieving laser frequency conversion and expansion. The relatively wide Raman linewidth means that the crystal can cover a certain range of frequencies during Raman conversion, which is beneficial for achieving broadband frequency conversion and spectral extension.
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