§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4239645A Expired / Lapsed US ⏱️ 0.0 years remaining

Phosphate base laser glasses

Assignee: Hoya Glass Works Ltd
•
Filing: 1976-03-17
•
Granted: 1980-12-16
•
Expires: 1996-03-17
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A phosphate base laser glass comprising 55-70% P 2 O 5 , 1-15% Al 2 O 3 , 0-25% Li 2 O, 0-25% Na 2 O, 0-8% K 2 O, the total proportion of Li 2 O, Na 2 O, and K 2 O being 10-25%, 0-15% BaO, 0-15% ZnO, 0-15% CaO, 0-15%, SrO, 0-15% MgO, the total proportion of BaO, ZnO, CaO, SrO, and MgO being 5-15%, 0-5% Y 2 O 3 , 0-5% La 2 O 3 , 0-5% GeO 2 , 0-5% CeO 2 , 0-3% Nb 2 O 5 , 0-3% MnO 2 , 0-2% Ta 2 O 5 , 0-1% Sb 2 O 3 , and 0.01-5% Nd 2 O 3 , all % being mole %. The phosphate base laser glass of this invention has a high induced emission cross section, a low non-linear refractive index coefficient, and excellent acid resistance and divitrification resistance. By replacing partially or wholely one or more of LiO 2 , Na 2 O, K 2 O, BaO, ZnO, CaO, SrO, MgO or Al 2 O 3 by LiF, NaF, KF, BaF 2 ZnF 2 , CaF 2 , SrF 2 , MgF 2 or AlF 3 , respectively, the above properties of the laser glass are further improved.

Inventors

  • 👤 Tetsuro Izumitani
  • 👤 Michitaka Tsuru

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 23:24
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; C03C3/247; C03C3/16; C03C3/17; C03C4/00; C03C4/0071; H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/17

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 158 words
A phosphate base laser glass possessing an induced emission cross section σ of 4.50 to 5.20×10 -20 cm 2 , a non-linear refractive index coefficient n 2 of 1.13 to 1.24×10 -13 e.s.u., an acid resistance weight loss Da of 0.15 to 0.17% by weight and a devitrification resistance Tg/LT of 0.470 to 0.485, consisting of (i) 58 to 67% P 2 O 5 , (ii) 4 to 10% Al 2 O 3 , (iii) 9 to 15% Li 2 O, (iv) 4 to 10% Na 2 O, (v) 0 to 12% CaO, 0 to 12% MgO, 0 to 12% CaF 2 , 0 to 12% MgF 2 , the total proportion of said CaO, MgO, CaF 2 and MgF 2 being 5 to 12%, (vi) 0 to 3% Y 2 O 3 , (vii) 0.2 to 0.8% Nb 2 O 5 , and (viii) 0.2 to 1.5% Nd 2 O 3 , said percentages being by mole.
Claim 2
Dependent Claim 158 words
A phosphate base laser glass possessing an induced emission cross section σ of 4.50 to 5.20×10 -20 cm 2 , a non-linear refractive index coefficient n 2 of 1.13 to 1.24×10 -13 e.s.u., an acid resistance weight loss Da of 0.15 to 0.17% by weight and a devitrification resistance Tg/LT of 0.470 to 0.485, consisting of (i) 58 to 67% P 2 O 5 , (ii) 4 to 10% Al 2 O 3 , (iii) 9 to 15% Li 2 O, (iv) 4 to 10% Na 2 O, (v) 0 to 12% CaO, 0 to 12% MgO, 0 to 12% CaF 2 , 0 to 12% MgF 2 , the total proportion of said CaO, MgO, CaF 2 and MgF 2 being 5 to 12%, (vi) 0 to 3% Y 2 O 3 , (vii) 0.2 to 0.8% Nb 2 O 5 , and (viii) 0.2 to 1.5% Nd 2 O 3 , said percentages being by mole.
Claim 3
Dependent Claim 39 words
The phosphate base laser glass as claimed in claim 1 wherein one or more of Li 2 O, Na 2 O, or Al 2 O 3 is partially or wholely replaced by LiF, NaF, or AlF 3 , respectively.
Claim 4
Dependent Claim 28 words
The phosphate base laser glass as claimed in claim 1, wherein the mole percent of Li 2 O is greater than the mole percent of Na 2 O.

References Cited (Backward Citations)

US3580859A Cited
US3731226A Cited
US3846142A Cited
US4022707A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-12-16 1984-06-16 1984-12-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-12-16 1988-06-16 1988-12-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-12-16 1992-06-16 1992-12-16 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag