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         New Products             Nd:YAG Rods
 

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;

 

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 TEMoo mode

  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 as f100x80mm 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

2.8x10-19 cm-2

Relaxation Time of Terminal Lasing Level

30 ns

Radiative Lifetime

550 ms

Spontaneous Fluorescence

230 ms

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

  

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:

 

 Diameter3, length 50mm

 Diameter 3, length 63mm

 Diameter 3, length 110mm

 Diameter 4, length 50mm

 Diameter 4, length 80mm

 Diameter 4, length 110mm

 Diameter 4, length 120mm

 Diameter 4, length 130mm

 Diameter 4, length 140mm

 Diameter 5, length 110mm

 Diameter 5, length 115mm

 Diameter 5, length 130mm

 Diameter 6, length 110mm

 Diameter 6, length 120mm

 Diameter 6, length 130mm

 Diameter 6, length 150mm

 Diameter 6, length 165mm

 Diameter 7, length 120mm

 Diameter 7, length 165mm

 Diameter 8, length 120mm

 Diameter 8, length 150mm

 Diameter 10, length 150mm

 

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

 

 Nd:YVO4       KTA        Er:YAG      (Nd, Ce):YAG     Yb:YAG     Cr4+:YAG

Sintec Optronics Pte Ltd

10 Bukit Batok Crescent #07-02 The Spire Singapore 658079

Tel: +65 63167112 Fax: +65 63167113  

E-mail: sales@sintec.sg sales@SintecOptronics.com

URL: http://www.sintec.sghttp://www.SintecOptronics.com

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