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Neodymium-doped Yttrium-Aluminum Garnet (Nd:YAG)
crystal, which continues as the best
of the rare earth garnet materials that are
characterized by four-level laser operation which permits low
threshold pulse and cw operation, is the most mature and widely used
solid-state laser material adopted by R&D, medical, industrial and
military customers. Its main and obvious advantages are:
high gain,
low threshold,
high efficiency,
low loss at 1.064 m m, as
well as high optical quality,
good thermal conductivity and thermal shock
characteristics,
stable chemical and mechanical properties,
which make Nd:YAG as the most suitable and commercial laser material
for various modes of operation (CW, pulsed, Q-switched, mode locked
and cavity dumped).
Beijing Gospel OptoTech Co. (GOT)
has a complete product line with facilities for the growth, polishing
and coating of Nd:YAG crystal. The advanced bonding technology has
been developed in GOT to meet customers' requirements. Now
GOT manufactures and supplies not only lots of disks and rods but
slabs and polyhedrons with multifarious dimensions and customer
specifications for versatile laser sources. Please contact us for
details.
In GOT's R&D division, our engineers are
developing doped YAG crystals with other various ions such as Cr4+:YAG,
Yb:YAG, Er:YAG, Ce:Nd:YAG, Ho:Tm:Cr:YAG, Nd:Cr:YAG, etc., which extend
the limits of the usage of YAG crystals. We have begun to supply
Cr4+:YAG,
Yb:YAG, Er:YAG with
high optical quality in global market for years. By the way, GOT
also provides pure YAG (over 3 inches diameter) without Nd dopant,
which has wide applications in microelectronic industries. The latest
technical information of YAG crystals will be provided.
Please contact us for YAG products with top quality and
the best prices.
Basic Properties
¨ Density : 4.55g/cm3
¨ Atomic Density :
~1.2x1020 atoms/cm3 (1.0 atm% Nd dopant)
¨ Chemical Formula :
Nd:Y3Al5O12
¨ Crystal Structure :
Cubic
¨ Lattice Parameter :
12.01 A
¨ Melting Point : 1970°
C
¨ Mohs Hardness : 8.5
¨ Water Absorption :
Zero
¨ Extinction Ratio :
22~28dB (according to actual sizes)
¨ Refractive Index :
1.820 ± 0.003(d)
¨ Thermal Expansion
Coefficient :[100] Orientation--8.2x10-6/° C (0-250° C)
[110] Orientation--7.7x10-6/° C (0-250° C)
[111] Orientation--7.8x10-6/° C (0-250° C)
¨ Thermal Conductivity
:20° C---0.0320 cal/sec ° C cm
40° C---0.0290 cal/sec ° C cm
100° C--0.0250 cal/sec ° C cm
200° C--0.0225 cal/sec ° C cm
¨ Modulus of Elasticity
: 44.9x106 PSI
¨ Tensile Strength :
25-30x106 PSI
Optical and Laser Properties
¨ Lasing Wavelength :
1.064 m m, 1.320 m m
¨ Pumping Wavelength :
807.5 nm
¨ Radiative Lifetime :
550 m s
¨ Fluorescence Lifetime
: 230 m s
¨ Absorption
Coefficient : 7.2 cm-1 @0.808 m m
¨ Absorption Length :
1.42 mm @0.808 m m
¨ Intrinsic Loss
Coefficient : 0.003 cm-1 @1.064 m m
¨ Polarized Laser
Emission : non-polarization
¨ Stimulated Emission
Cross Section : 2.8x10-19 cm2 @1.064 m m
Standard Specs. of Nd:YAG Rods
¨ Nd Doping Level : 0.9
±0.1 atm% and 1.1 ±0.1
atm%
¨ Standard Diameter : f
2, 3, 4, …, 10 mm; or f 1/4", 3/8"
¨ Diameter Tolerance :
1)±0.02~0.05 mm; 2) +0.0/-0.02 mm
¨ Standard Length :
0.5, 1 mm; 5, 10, 30, …, 150 mm; or 2", 3", 4", 6"
¨ Length Tolerance :
±0.2~0.5 mm
¨ Orientation : <111>
crystalline direction (<5° )
¨ Bubbles, inclusions
and scattering sites when viewed in white
, focused illuminator light and under crossed
polarizers
visible to naked eye
:Free of imperfections
¨ Wavefront Distortion
:0.25~0.5 fringes/inch (according to actual sizes)
¨ Scratch/Dig Code :
10/5 per MIL-O-13830A
¨ Barrel Finish :50-80
micro-inch (grooved-barrel also available)
¨ Flatness : l /10
@633nm
¨ Parallelism : < 10
arc seconds
¨ Perpendicularity : <
2 arc minutes
¨ Typical Coatings :
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1) |
Both
ends AR @1064 nm (R1064nm<0.1%); |
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2) |
S1 - HR @1064 nm & HT
@808 nm
(R1064nm>99.9% & T808nm>97%);
S2 - AR @1064 nm (R1064nm<0.1%); |
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3) |
S1 - HR @1064&532 nm & HT
@808 nm
(R1064nm>99.9%,R532nm>99.5%,T808nm>97%)
S2 - AR @1064 nm & 532 nm
(R1064nm<0.1% & R532nm<0.2%); |
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4) |
Other
kinds of coatings upon requirements. |
Standard Specs. of Nd:YAG Slabs
¨ Standard Dimension:
- Width: from 3 mm to 20 mm
- Height: from 3 mm to 12 mm
- Length: from 20 mm to 150 mm
¨ Dimension Tolerance:
±0.02 mm
¨ Width dimension of
slab to extend radially from center of Nd:YAG boule within 5° , when
growth axis along <111>;
¨ Face S1 & S2
perpendicular to Face S5 to within 5 arc minutes;
¨ Face S1 & S2 polished
flat to within l /10 @632.8 nm over test region;
¨ Face S3 & S4 parallel
to each other within 5 arc minutes;
¨ Face S3 & S4 polished
flat to within l /2 per 1 inch over test region;
¨ Face S1, S2, S3 & S4
surface finish 10/5 scratch/dig per MIL-0-13830A;
¨ Face S5 & S6 fine
ground;
¨ Protective chamfers
to be applied to all edges unless otherwise stated;
¨ Parallelogram-shape
slabs and polyhedrons also available in GOT.
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