| |
 |
 |
 |
| Physical and Optical
Properties |
| Chemical formula |
Ti 3+ : Al2O3 |
Nd:Y3 Al5 O12 |
Nd:YVO4 |
| Crystal structure |
Hexagonal |
Cubic |
Zircon Tetragonal, space group D4h, |
| Melting point |
2050°C |
1970°C |
|
| Density |
3.98 g/cm3 |
4.56 g/cm3 |
4.22 g/cm3 |
| Mohs hardness |
9 |
8.5 |
Glass-like, ~5 |
| Thermal conductivity Coefficient |
0.11 cal/(°C x sec x cm) |
14 W/m /K @20 °C, 10.5 W /m /K @100
°C. |
||C: 5.23 W/m/K; ^C: 5.10 W/m/K |
| Thermal Expansion Coefficient |
|
7.8 x 10-6 /K [111], 0 - 250 °C |
aa=4.43x10-6/K, ac=11.37x10-6/K |
| Lasing Wavelength |
660~1050 nm (795 nm) |
1064 nm |
914nm, 1064 nm, 1342 nm |
| Absorption range |
400~600 nm (488 nm) |
lamp pump |
808nm |
| Lattice constants |
a=4.748, c=12.957 |
12.01 |
a=b=7.12, c=6.29 |
| Fluorescence lifetime |
3.2 µsec (T = 300 K) |
230msec |
90 msec (about 50 m s for 2 atm% Nd doped)
@ 808 nm |
| Absorption Coefficient |
1.0~7.5cm -1 @490nm |
7.1 cm-1 |
31.4 cm -1 @ 808 nm |
| Refractive index |
1.76 @ 800 nm |
1.82 @1064nm |
no =1.9573, ne =2.1652
@ 1064nm |
| Polarized Emission |
Unpolarized |
Unpolarized |
parallel to optic axis (c-axis) |
| Typical
Specification and Tolerance |
| conentration |
0.06~0.5 wt% Ti dopant |
0.5~1.2 atm% Nd dopant (10% tolerance) |
0.2 ~ 3 atm% Nd dopant (10% tolerance)
|
| Figure of Merit |
100~300 |
|
|
| Aperature |
2~50mm |
3 ~ 14mm |
1 ~ 20mm |
| Path Length |
2~130mm |
1 ~ 160mm |
0.02 ~ 20mm |
| End configuration |
flat/flat or Brewster/Brewster ends or
Specified |
flat/flat or Brewster/Brewster ends or
Specified |
flat/flat or Brewster/Brewster ends or
Specified |
| Orientation |
Optical axis C normal to rod axis |
<111> crystalline direction (+/-0.5°C) |
a-cut crystalline direction (+/-0.5°C) |
| parallelism |
<λ/10
arc seconds |
| Surface quality |
better than 60/40 scratch/dig per MIL-O-13830A |
better than 20/10 Scratch/Dig per MIL-O-1380A |
better than 20/10 Scratch/Dig per MIL-O-1380A |
| Surface flatness |
<λ/10 @633nm |
<λ/10 at 632.8nm |
<λ/10 at 632.8nm |
| Wavefront distortion |
<λ/4 per inch @ 633 nm |
<λ/10 at 632.8nm for 3 ~7mm
<λ/8 per inch at 632.8nm for >=7mm |
<λ/8 at 633nm |
| Perpendicularity |
< 5 arc minutes |
< 5 arc minutes |
< 5 arc minutes |
| Clear aperture |
Central 90% |
Central 95% |
Central 95% |
| Chamfer |
0.15x44° |
0.15x45° |
0.15x45° |
| Damage threshold |
over 15J/cm2 (rods without coating)
over 700MW/cm2 (coating) |
over 15J/cm2 (rods without coating)
over 700MW/cm2 (coating) |
over 15J/cm2 (rods without coating)
over 700MW/cm2 (coating) |
| Coatings |
AR@700~1100nm |
a) AR@1064nm,R<0.1%
b) AR@1064nm,R<0.1%;
HT@808nm,T>95%;
c) HR@1064nm,R<99.8%;
HT@808nm,T>95%;
d) HR@1064nm,R<99.8%;
HT@808nm,T>95%;
HR@532nm,R>99%; |
a) AR@1064nm,R<0.1%
b) AR@1064nm,R<0.1%;
HT@808nm,T>95%;
c) HR@1064nm,R<99.8%;
HT@808nm,T>95%;
d) HR@1064nm,R<99.8%;
HT@808nm,T>95%;
HR@532nm,R>99%; |
