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        Ytterbium laser glass

      

    Yb3+-doped glass materials are desirable for generation of ultrashort  pulse and as tunable laser sources because of their broad absorption and emission bandwidths. 
       A new Yb3+ doped phosphate laser glass, YP1 ,has been developed. This glass has long lifetime and nearly zero temperature coefficient of optical path length. Fluorescence lifetime is above 2ms. YP1 has the temperature oefficient of optical path length of +0.42¡Á10-6/ºC.
         Yb3+ doped borate laser glass, YB1, exhibits a low thermal expansion coefficient and a negative temperature coefficient of refractive index, resulting in acceptable behavior. YB1 has a high Cross section for stimulated emission of 1.65¡Á10-20cm2.

Properties of Yb3+-doped laser glass

 

YP1

YB1

LASER PROPERTIES
Yb2O3 (wt%)
Yb3+ conc. (1020ions/cm3)
Cross section for stimulated emission(10-20cm2)
Fluorescent lifetime(usec)
Fluorescence half-line width at 290ºK(Å)
Center lasing wavelength(nm)



16.10
14.51
1.3
2200
506.0
1053



13.75
16.8
1.65
850
518.8
1053

OPTICAL PROERTIES  
Non-linear refractive index coeff.n2(¡Á10£­13e.s.u)
n£¨1053nm£©
nd
nF
nc
Abbe value
dn/dT (10-6/ºC) £¨20~100ºC£©
Coeff.of linear thermal expansion (10-6/ºC)£¨20~100ºC£©
Thermal coeff. of optical path length (10-6/ºC) £¨20~100ºC£©


1.48
1.52123
1.52958
1.53517
1.52691
64.1
-5.3
10.8
0.42


1.96
1.6450
1.6649
1.6721
1.6602
58.42
-0.8
6.5
3.5

THERMAL PROPERTIES
Transformation temp.(ºC)
Softening temp.(ºC)
Coeff.of linear thermal expansion (10-6/ºC) (100~TgºC)



430
473
12.8



609
650
 7.6

OTHER PROPERTIES
Density (g/cm3)
Chemical durability



2.95
excellent



3.99
excellent

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