Nd:YLF
 

 

 

Nd:YLF is an excellent crystal for modelocked operation because it combines the characteristics of weak thermal lensing, large fluorescence line width and naturally polarized oscillation.

 

    1. High power, low beam divergence, efficient single mode operation

 

    2. High average power Q-switching at a moderate repetition rate

 

    3. Good Mechanical and Thermal Properties

 

    4. Thermal lensing lower than YAG serials Physical Properties

 

 

 

Physical Properties

  

Chemical Formula

LiY 1.0-x Nd x F 4

Lattice Parameters

a=5.16?br> b=10.85?/font>

Crystal Structure

Tetragonal

Space Group

I4 1 /a

Nd atoms/cm3

1.40x10 20 atoms/cm 3 for 1% Nd doping,

Mohs Hardness

4 ~ 5

Melting Point

819

Density

3.99 g/cm 3

Modulus of Elasticity

85 GPa

Thermal Expansion Coefficient

8.3x10 -6 /k ^ c, ac=13.3x10 -6 /k ||c

Thermal Conductivity Coefficient

0.063 W/cm K

Specific Heat

0.79 J/g K

 

 

 

 

Optical Properties

 

Transparency Region

180nm to 6.7 m m

Peak Simulation Emission Cross Section

1.8x10 -19 cm 2 (E || c) at 1.047 m m 
1.2x10 -19 cm 2 (E ^ c) at 1.053 m m

Spontaneous Fluorescence Lifetime

485 m s for 1% Nd doping

Scatter Losses

<0.2% / cm

Peak Absorption Coefficient

a =10.8cm -1 (792.0 nm E || c) 
a =3.59cm -1 (797.0 nm E ^ c)

Refractive Indices

Wavelength (nm)

262

350

525

1050

2065

n e

1.485

1.473

1.456

1.448

1.442

n o

1.511

1.491

1.479

1.470

1.464

Sellmeier Equations

n i 2 ( l ) = A + B l 2 /( l 2 -C) - D l 2 /( l 2 -E) 

A

B

C

D

E

n o

3.38757

0.70757

0.00931

0.18849

50.99741

n 2

3.31021

0.84903

0.00876

0.53607

134.9566

 

 

 

Specifications

 

Nd dopant:                        1 at%
Diameter Tolerance:           +/-0.05mm
Length Tolerance:              +/-0.5mm
Orientation:                       <2deg.
Surface quality:                 Better than 10-5 scratch/dig
Flatness:                          <1/8 lambda at 633nm
Wavefront distortion:          < 1/4 lambda at 633nm
Parallelism:                      <10 arc Sec.
Perpendicularity:               <5 arc Min.
Chamfer:                          0.15mmx45deg.
AR coating:                      R<0.15% at 1047/1053nm
    
 

 

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