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Broadband,Inc.
〒121-0832
東京都足立区
古千谷本町4-7-9
お問い合わせ
TEL:03-5838-0082
ask@bblaser.com |
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Nd:YLF |
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Abal
OptoTek社 (AOTK)
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Neodymium
doped Yttrium Lithium Fluoride Crystal (Nd:YLF)
YLF
is grown utilizing a advanced modified
Czochralski technique. Nd:YLF offers an
alternative to the more common Nd:YAG host for
near IR operation. The combination of weak
thermal lensing, large fluorescence line width
and naturally polarized oscillation makes
Nd:YLF an excellent material for CW,
modelocked operation.
Advantages of Nd:YLF Crystals
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High
power, low beam divergence, efficient single
mode operation
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High
average power Q-switched at a moderate
repetition rate
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Linear
polarized resonators for Q-switching and
frequency doubling
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Stimulated
emission cross section and lifetime product is
favorable for low CW threshold
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1053nm
output matches gain curves of Nd:Glass and
performs well as an oscillator and
pre-amplifier for this host
Basic Properties
| Formula |
Nd:
LiYF4 |
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Crystal
Structure
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Tetragonal
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| Space
Group |
I41/a |
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Lattice
Parameters
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a=5.16Å,c=10.85
Å
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Mohs
Hardness
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4-5
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Melting
Point
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825°C
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Density
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3.95
g/cm3
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Thermal
Conductivity
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0.06
W /cm°C
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Heat
Capacity
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0.79
J g-1 K-1
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Thermal
Expansion
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13
x 10-6 °C-1
(along a axis)
8
x 10-6 °C-1
(along c axis)
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Young’s
Modulus
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7.65x108
g/cm2
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Optical
and Special Properties
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Transparency
Region
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180
~ 6700 nm
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| Peak
Stimulated Emission Cross Section |
1.8×10-19
cm2 (E‖c)
at 1047 nm
1.2×10-19 cm2
(E丄c)
at 1053 nm |
| Spontaneous
Fluorescence Lifetime |
485μs
for 1% Nd |
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Scatter
Losses
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<0.2%/cm
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Peak
Absorption Coefficient (for
1.2% Nd)
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a
=10.8cm-1 (792.0 nm E‖c)
a
=3.59cm-1 (797.0 nm E丄c)
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| Fluorescent
Lifetime
(Nd
1at%) |
230
μs |
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Laser
Wavelength
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1047nm
(‖c,
or a-cut crystal)
1053nm
(丄
c,
or c-cut crystal) nm
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Index
of Refraction
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ne
= 1.456,
no
= 1.479
at 525 nm
ne
= 1.448,
no = 1.470
at 1050 nm
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Therm-optic
Coefficients (dn/dT)
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-2.44x10
-6/°C,
-0.54x10 -6/°C
at 436 nm
-2.86x10 -6/°C,
-0.91x10 -6/°C
at 578 nm
-4.30x10 -6/°C,
-2.00x10 -6/°C
at 1060 nm
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| Sellmeier
Equations ( λin µm) |
no2
=1.38757+0.70757λ2/(λ2
-0.00931)+0.18849λ2/(λ2
-50.99741)
ne2
=1.31021+0.84903λ2/(λ2
-0.00876)+0.53607λ2/(λ2
-134.9566) |
YLF exhibits tetragonal symmetry with
crystallographic axes a=b≠c,
which are orthogonal ,α=β=g=90°.
YLF is a uniaxial crystal with its optical
axis aligned with the c axis. Our standard
Nd:YLF is grown along the a direction. The π-transition
(E‖c)
occurs at 1047nm with an emission
cross-section 50% greater than the σ-transition
(E丄c)
cross section at 1053nm.
Standard Specifications
| Standard
Nd Dopant Concentration |
1.0±0.1% |
| Wavefront
Distortion |
≤
0.25λ/inch |
| Extinction
Ratio |
≥28
dB |
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Rod
Sizes
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Diameter:
3~15mm, Length: 1~150mm
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Dimensional
Tolerances
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Diameter:
+0.00/-0.05mm, Length
+0.5/-0.2 mm
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Flatness
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λ/8
@633 nm
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Parallelism
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<
10 arc seconds
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Perpendicularity
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<
5 arc minutes
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Surface
Quality
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10/5
Scratch/Dig per MIL-O-13830A
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Barrel
Finish
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50
- 80 micro-inch (RMS)
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Clear
Aperture
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>
Central 90%
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| AR
Coatings |
R
< 0.10% @1064 nm per surface |
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