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i-Line High Homogeneity Glass |
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These
13 glass types have excellent internal transmittance in the near UV
(>98% at i-line, 365 nm) and are solarization resistant. They can be
produced in large sizes with outstanding homogeneity values
(+/- 0.5 x 10-6).
These glasses are ideally suited for use in semiconductor optics
(stepper cameras and illumination systems) and astronomical optics
(spectragraph cameras, etc.).
i-Line PDF Information Sheet
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| Glass Type |
Internal
Transmittance
10mm thick
(365nm) |
Solarization
Resistance |
Optical Homogeneity
Capability
Glass Type (x10-6) |
Deviation of
ni within a
single lot
(x10-5) |
Tolerance of
Refractive Index
(x10-5) |
| Dia 160 |
Dia 210 |
Dia 260 |
| S-FPL51Y |
0.997 |
Good |
±1.0 |
- |
- |
±2 |
+20±20 |
| S-FSL5Y |
0.999 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+15±20 |
| BSL7Y |
0.998 |
Good |
±0.5 |
±0.8 |
±1.0 |
±1 |
+20±20 |
| BAL15Y |
0.994 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| BAL35Y |
0.996 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+20±20 |
| BSM51Y |
0.995 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+30±20 |
| PBL1Y |
0.997 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| PBL6Y |
0.998 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| PBL25Y |
0.995 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| PBL26Y |
0.996 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| PBL35Y |
0.997 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2x10-5 |
+10±20 |
| PBM2Y |
0.986 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| PBM8Y |
0.991 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
| PBM18Y |
0.993 |
Good |
±0.5 |
±0.8 |
±1.0 |
±2 |
+10±20 |
Explanation For Table of i-Line Glass
1- Internal Transmittance
Internal transmittance of the glass is indicated as guaranteed minimum
transmittance at 365nm (10 and 25 mm sample thickness). Please note
this is internal transmittance, reflection losses are not included.
2- Solarization
The degree of solarization is indicated as a decrease in transmittance
caused by radiation from a super high pressure mercury-vapor lamp. The
detailed measurement method is described in the "Japanese Optical Glass
Industrial Standard (JOGIS)".
3-Optical Homogeneity
Optical Homogeneity (nΔ) is guaranteed by use of our He-Ne laser
interferometers. The nΔ specification is indicated for three diameter
ranges (Ø 160 mm or less, Ø 210 mm or less, Ø 260 mm or less) due to
the nΔ variances caused by glass type, size, and shape. Please note, if
the ordered thickness is less than 25 mm, we will use a 25 mm thick
test piece for n measurement. Please contact us when lower nΔ
specifications are required.
4- Refractive Index (ni) Variation within one Lot (Sn Standard)
The indicated Sn value is the refractive index variation after
annealing within a single batch (same melt, same annealing run). 
5- Refractive Index Tolerance
The standard refractive index (ni) of our i-line glass is
higher than our catalogue nominal values. This is due to
the longer annealing times which are necessary to obtain
the desired homogeneity levels. Longer annealing times
result in higher refractive indices.
Example: +20±30×10-5
+20
(+0.00020) means the increase against our catalogue nominal ni value.
The ±30 (±0.00030) is then the tolerance on the new nominal value. i.e.
a glass type having a tolerance of +20±30 can vary from -10 (-0.00010)
to +50 (+0.00050) against standard catalogue nominal. Please consult us
when tighter tolerances are required.
6- Other
By using constants of dispersion formula on the catalog table,
refractive indices for any wavelength between 326 to 1129nm can be
calculated. When calculating refractive indices for any wavelength
between 1129 and 2325nm, please refer to following table.
The constants of dispersion (1129-2325nm)
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