Nd:YAG Rod

  • Update:Jun 14, 2017
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Capabilities: Rod size: 2 - 12mm in diameter and 1 - 180mm in length; Nd dopant concentration : 0.6% - 1.3%; Polishing; AR-coating or/and dichroic coating.

Product Introduction

Capabilities:  

Nd:YAG Crystal  

During the last decade, Nd:YVO4 has been developed as a promising substitutes for Nd:YAG in diode-pumped lasers due to its high absorption and emission cross-sections. However, the applications of Nd:YVO4 are limited due to its poor physical-mechanical properties and growth difficulty etc. Now, we have developed the high-doped Nd:YAG (SUPER-Nd:YAG) recently. It shows high absorption cross-section and have many advantages over Nd:YVO4:

The high neodymium-ion doped YAG has been grown by the novel technique-Temperature Gradient Technique (TGT). The Nd concentration can be doped up to 3%. As large asf100x80mm bulk crystals with excellent optical homogeneity, less scattering particles, low dislocation density have been obtained.  

Basic Properties:   

Chemical Formula Y3Al5O12
Crystal structure Cubic
Lattice constant 12.01Angstrom
Melting point 1970° C
Density 4.5g/cm3
Reflective Index 1.82
Thermal Expansion Coefficient 7.8x10-6/K <111>
Thermal Conductivity (W/m/K) 14W/m/K, 20° C  10.5W/m/K, 100° C
Mohs hardness 8.5
Stimulated Emission Cross Section 2.8x10-19cm-2
Relaxation Time of Terminal Lasing Level 30 ns
Radiative Lifetime 550ms
Spontaneous Fluorescence 230ms
Linewidth 0.6 nm
Loss Coefficient 0.003 cm-1@ 1064nm

  Laser Properties:  

·SUPER-Nd:YAG shows high absorption coefficients at pumping wavelengths. Therefore, a crystal short-in length (e.g.1mm) is preferred and compact microchip lasers can be constructed by using SUPER-Nd:YAG. 

Spectra Properties with Concentration:  

Nd:Dopant 2.5% 2% 1.5% 1.3% 1.1% 1%
Fluorescence lifetime 160ms 180ms 200ms 210ms 220ms 240ms
Absorption coefficient 7.55cm-1 6.57 cm-1 5.36 cm-1 4.66 cm-1 3.88 cm-1 3.55 cm-1
Optical Quality/Grades/Nd Level
 Rod Size  Standard Grade  Premium Grade  Standard [Nd]: 1.1 Atom%  Low [Nd]: 0.8 Atom%
L D Extinct. Ratio Wave Error Extinct. Ratio Wave Error Tolerance of [Nd] Over Rod Length Tolerance of [Nd] Over Rod Length
mm mm (dB) (waves) (dB) (waves) Average [Nd] delta [Nd] Average [Nd] delta [Nd]
50 3 >25 <0.19 >30 <0.13 ±.08 0.06 ±.07 0.05
50 4 <0.21 <0.15
50 5 <0.24 <0.16
100 4 >22 <0.28 >27 <0.18 ±.08 0.13 ±.06 0.09
100 5 <0.32 <0.21
100 6 <0.36 <0.23
100 6.35 <0.37 <0.24
150 6.35 >20 <0.48 >25 <0.30 ±.05 0.18 ±.04 0.13
150 8 <0.58 <0.35
150 9.52 <0.67 <0.40
200 8 >19 <0.71 >24 <0.42 ±.02 0.23 ±.02 0.17
200 9.53 <0.82 <0.49
200 10 <0.86 <0.51

Coatings

 Type Reflectivity Damage Threshold Damage Threshold
(%R per Surface) (<20nS Pulse, GW/cm^2) (CW, kW/cm^2)
 AR @1064nm  <0.15   >1.4 >25
 HR @1064nm  >99.9   >1.0 >25

Typical Dimensions:

esides the above dimensions, we also have other dimensions or custom-make according to your specific requirement.

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