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1.nd yag laser rod, 2.Material nd yag crystal, 3.Diameter 2-12mm, 4.Length 1-180mm, 5.Damage threshold: >15J/cm2 - details see: https://www.machineto.com/nd-yag-laser-rod-10230927

Nd:YAG Rod

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;

Specifications:

• Material: Nd:YAG
• Nd dopant concentration: as specified±0.1%
• Parallelism: £10²
• Flatness: l/10 @ 632nm
• Perpendicularity: <2¢
• Interference fringes: <0.5 fringes/inch
• Extinction ratio: >15db
• Transmission with AR coating: ³99.8%
• Damage threshold: > 15J/cm²

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:

• Due to the cubic symmetry and high quality, Nd:YAG is easy to operate with TEM_oomode
• Nd:YAG can be Q-switched with Cr4+:YAG directly
• Nd:YAG can produce blue laser with the frequency-doubling of 946nm
• Nd:YAG can be operated in a very high power laser up to kW level

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.
• Due to the broader and smoothly-varied bandwidth of absorption, it allows of less stringent requirements of temperature control.
• Almost same output have been achieved both in a (111)-cut 1mm long Nd:YAG and an a-cut 1mm long YVO4 microchip lasers with a very short (9mm) laser cavity.

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

Nd:YAG Specifications:

Standard Dimensions:	3x3x3mm3, 3x3x1mm3(cubic)
Diameter:	f3-12mm (rod)
Length:	1-152mm
Crystallographic orientation:	<111>
Nd Dopant Level:	0.7, 0.9, 1.0, 1.1, 1.3, 1.5, 2.0, 2.5± 0.1at%
Extinction Ratio:	>28 dB
Optical quality:	<0.5 fringes/inch
Diameter tolerance:	± 0.05mm
Length tolerance:	± 0.7mm
End face perpendicularity:	<5 arc minutes
Parallelism:	<10 arc seconds
Wavefront distortion:	l/8
Flatness:	l/10
Surface quality:	10/5 @MIL-O-13830A
HR-Coating:	R>99.8%@1064nm and R<5%@808nm
AR-Coating (Single layer MgF2):	R<0.25% per surface (@1064nm)

We can also provide Nd:YAG rod with multilayer hard coating that can be used for high power laser.