Glasses having a low non-linear refractive index for laser applications
AssigneeJenaer Glaswerk Schott & Gen.
InventorsMarga Faulstich, Walter Jahn, Georg Krolla, Norbert Neuroth
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Abstract
Glass composition ranges are described which permit the introduction of laser activators into fluorphosphate glass with exceptionally high fluorine content while forming glasses of high crystallization stability and permitting the realization of large melt volumes. The high fluorine content imparts to the glasses an exceptionally low nonlinear refractive index n.sub.2 down to O,4 .times.10.sup.-13 esu.
Claims6
Glasses suitable for laser applications having a low non-linear refractive index n.sub.2 <0.60 in the optical position range
- nd=1.40-1.44
- .nu.d=94-86
- which consist essentially of the following components, expressed as oxides in weight percent:
- P.sub.2 O.sub.5 :
- 4.5-9.10
- As.sub.2 O.sub.5 :
- 0-4.5
- P.sub.2 O.sub.5 +As.sub.2 O.sub.5 :
- 8.44-9.10
- alkali metal oxides:
- 4.44-10.65
- MgO:
- 3.88-4.23
- CaO:
- 22.13-25.14
- MgO+CaO:
- 26.11-29.02
- SrO:
- 0-11.14
- BaO:
- 0-9.62
- SrO+BaO:
- 5.08-11.14
- Al.sub.2 O.sub.3 :
- 18.70-20.03
- Nd.sub.2 O.sub.3 :
- 0-2.58 F.sub.2 -O:
- 27.61-28.90.
Glasses suitable for laser applications having a low non-linear refractive index n.sub.2 =0.55-0.65 in the optical position range
- nd=1.44-1.465
- .nu.d=90-85
- which consist essentially of the following components, expressed as oxides in weight percent:
- P.sub.2 O.sub.5 :
- 7.95-11.30
- As.sub.2 O.sub.5 :
- 0-2.25
- P.sub.2 O.sub.5 +As.sub.2 O.sub.5 :
- 9.70-11.30
- alkali metal oxides:
- 1.92-6.38
- MgO:
- 3.82-4.21
- CaO:
- 14.29-19.83
- SrO:
- 9.12-17.90
- BaO:
- 3.16-10.98
- Al.sub.2 O.sub.3 :
- 15.24-17.07
- Nd.sub.2 O.sub.3 :
- 1.10-2.35
- MgO+CaO:
- 18.50-23.65
- SrO+BaO:
- 16.08-28.57
- F.sub.2 -O:
- 23.54-25.79.
Glasses suitable for laser applications having a low non-linear refractive index n.sub.2 =0.60-0.70 in the optical position range
- nd=1.46-1.475
- .nu.d=88-83
- which consist essentially of the following components, expressed as oxides in weight percent:
- P.sub.2 O.sub.5 :
- 6.85-11.40
- As.sub.2 O.sub.5 :
- 0-4.41
- P.sub.2 O.sub.5 +As.sub.2 O.sub.5 :
- 11.09-11.40
- alkali metal oxides:
- 0-1.64
- MgO:
- 3.62-4.27
- CaO:
- 9.53-14.55
- SrO:
- 17.73-21.53
- BaO:
- 10.70-15.90
- Al.sub.2 O.sub.3 :
- 13.72-15.33
- Nd.sub.2 O.sub.3 :
- 0-2.18
- MgO+CaO:
- 13.65-18.66
- SrO+BaO:
- 28.71-37.43
- F.sub.2 -O:
- 21.25-23.42.
Dependencies are inferred from the claim text.