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Paul
Steeger
Dear Ohara Team, I am working at research institute HFML in the netherlands (Nijmegen) and I am interested in specific glasses you offer to make custom lenses. I am following some publications on S-TIH6 being used due to its low faraday rotation. I would be interested in discussing the properties and availability of such glasses with you. Kind regards Paul Steeger
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Adrian
Porazynski
Dear Ohara Team, we would love to get the information about the prices for the LICGC SP-01-membranes. The following products are of interest of us: □50mm×0.02mmt □50mm×0.045mmt □50mm×0.09mmt □50mm×0.18mmt Greetings from Germany, Porazynski
GariLynn
Billingsley
I am interested in purchasing fused silica blanks: 105 kg final weight 450 mm final diameter 300 mm final thickness quantity 4 to 8
1
Peter
Spuhler
We're working with an optics supplier that sources materials from you. They've quoted that your index of refraction homogeneity is <7ppm. I'm hoping to get a datasheet and also any additional insight why 7ppm vs 3ppm which is standard otherwise.
Paul
Michaloski
What is the index variation at HeNe (632.8nm) for piece to piece (or run to run) of the CLEARCERAM-Z HS?
庭綸
張
我們從網站上看到貴公司請問是否有提供受托熔解服務? 目前有光學玻璃熔煉生產需求，相關需求如下， 是否可依以下相關資訊提供粗估報價，或如需其他相關資訊，我們可簽訂NDA後提供，謝謝。 【熔煉相關需求及成品規格】 1.原料供應方式：我司提供原料（粉狀）或碎玻璃，並委託貴公司進行熔煉處理（代工處理），目前需求生產玻璃數：5-10支。 2.熔煉條件：熔煉溫度1200℃至1600℃，熔煉氣氛：依貴司爐體規範，但常用為氧氣。 3.熔煉方式及坩堝材質：單體式或連續式熔爐，且是否可提供相對應坩堝材質。 4.玻璃澆鑄（成型）尺寸：需求為塊材，尺寸為寬度250mm至350mm，厚度為20mm。 5.品質要求：因用於光學應用，我們要求產品無內部氣泡和脈理，其規範可以再討論。
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1
Jin
Lim
Dear Ohara Application Engineer, I submitted an inquiry through your Contact Us form on August 17 regarding the fracture toughness (KIC) and Weibull parameters (characteristic strength and Weibull modulus) of S-FPL51 and S-PHM52. As I have not yet received a response, I would like to follow up on my previous inquiry. I also have an additional question regarding chemical strengthening. Could you please advise whether S-FPL51 and S-PHM52 are suitable for chemical strengthening? If so, are there any special considerations, pretreatments, or process requirements before or during the chemical strengthening process? Any information, recommendations, or supporting data you can provide would be greatly appreciated, as they would be very helpful for our material selection and design evaluation. Thank you for your time and assistance. I look forward to your response. Best regards, Jin Lim
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Ashutosh
Patri
Hi, could you please provide us with a quote for the following SK-1300 wafer specifications: Dia: 150 mm, thickness: 0.675 mm, TTV: < 5 um, bow: < 10 µm, S/D: 20/10, polish: double-sided polished, Ra < 1 nm, quantity: 10. Also, please let us know the particle size and count on the cleaned wafers. Thank you. Best regards, Ashutosh
1
Michelle
Conway
We’re offering an up-to-date SPIE Photonics West 2026 attendee contact list covering photonics professionals, optical engineers, researchers, scientists, technology leaders, procurement specialists, and key decision-makers. Can I share the coverage and pricing? Thank you, Michelle If you do not wish to receive future emails, simply reply “Not Interested.”
1
Levent
Karaca
Is it possible to change the color of the glass? For example, can transparent glass be made opaque—or switched to a specific desired color at any moment—through an external stimulus, such as triggering transistors? Thank you
1
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Minna
Tuomaala
Hello, I´m interested what is the price for S-NPH3 per kilogram? Could you please send me that information to my e-mail. Thank you very much and have a nice day.
1
Joanna
Eades
UV/Laser grade CaF2 ~3.1” finished diameter + stock ~0.45” finished thickness + stock Qty ~10
lakshmi narayana
manickavasagam
I would like to get a quote for LICGC 50 mm sq x 300 um thickness 10 pieces
Duong
Vu
My team is evaluating cover glass options for a sensor application and consider fused silica and/or S-FTM16 a possible option. I would like to learn more about the product. We are looking at 0.5 mm and 1.0 mm thicknesses for shielding our sensors, and I wanted to ask whether the glasses can be supplied at either of those thicknesses. If you could also share a datasheet or transmission data for the material, that would help us assess fit.
Snehal
Satlawar
Hello, we are supporting a customer who is working with OHARA S-FPM2 optical glass and experiencing occasional haze/fogging during cleaning. We have a few technical questions regarding the surface chemistry and cleaning sensitivity of this glass, including whether isoelectric point (IEP) or zeta-potential data are available. Could you please connect me with the appropriate technical contact? Thank you.
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Jin
Lim
Hi Ohara technical representative, We are currently investigating lens fracture mechanisms associated with thermally induced stress in optical systems. The materials of interest are S-FPL51 and S-PHM52. We would appreciate it if you could provide any available material strength and reliability data for these glasses, including Weibull parameters (2P or 3P), fracture toughness (KIC), characteristic strength, Weibull modulus, or any other relevant mechanical properties that may support fracture risk assessment and thermal stress analysis. Additionally, any available information regarding crack initiation and propagation behavior, surface or edge defect sensitivity, environmental effects on strength, long-term reliability, or recommended design considerations for these materials would be highly valuable for our investigation. Thank you in advance for your support, and we would appreciate any information or references you can share. Best regards, Jin Lim
1
OPTICAL PROPERTIES

2.5 Temperature Coefficient of Refractive Index

Temperature coefficient of refractive index 〔Δn rel/ΔT〕

The refractive index of glass changes with temperature. The amount of change in the refractive index due to temperature changes is expressed as the temperature coefficient of the refractive index, and is defined by Δn / ΔT from the curve showing the relationship between the glass temperature and the refractive index. Δn / ΔT changes depending on the measurement wavelength and temperature range, so the Abbe number also changes with temperature.
There are two ways of showing the temperature coefficient of refractive index; one is the relative coefficient, Δnrel/ΔT (10-6 K-1) measured in dry air (101.3 kPa) at same temperature as the glass, and the other is the absolute coefficient ,Δnabs/ΔT (10-6 K-1) measured under vacuum.

The temperature coefficient of refractive index of each glass type is measured as Δnabs/ΔT according to ISO 6760-1 and from this value the Δnrel/ΔT value normally used in optical design is calculated. The relationship between Δn abs/ΔT and Δn rel/ΔT is given by the following formula.

Formula for temperature coefficient of refractive index of glass

n :Refractive index of glass sample (in air, 25 ° C)

Optical Properties
OPTICAL PROPERTIES

2.7 Internal Transmittance

Internal transmittance 〔 τi（10 mm）〕

“Internal transmittance” refers to the spectral transmittance of the glass itself, not including reflection losses at the optical glass-air interface; it indicates the transparency of the glass. Most optical glasses absorb a substantial amount of light in the near-ultraviolet region. For some glasses, especially those with a high refractive index, this absorption range also extends into the visible range. This absorption is not only caused by the composition of the glass; it is also affected by impurities in the glass, and varies slightly from melt to melt.

The spectral transmittance (including reflection loss) is measured based on the JOGIS-17 standard at wavelengths from 280 nm to 2400 nm in a pair of glass samples with different distances through which transmitted light passes. Then, the internal transmittance 〔τ<sub>i</sub>（10 mm）〕 at a glass sample thickness of 10 mm is calculated from the measurement data.

Optical Properties
OPTICAL PROPERTIES

2.6 Relational Constant for Temperature Coefficient of the Refractive Index

Relational constant for temperature coefficient of the refractive index

The temperature coefficient of the absolute refractive index of glass for wavelengths not listed in the data sheet can be calculated as a function of wavelength and temperature. Ohara uses the following equation.

Equation for Temperature Coefficient of absolute refractive index of glass
ｎ(λ,T0)： Refractive index at reference temperature
Ｔ0： Reference temperature (°C) (Ohara defines this as 25°C)
Ｔ： Target temperature (°C)
λ： Vacuum wavelength (μm)
D0、D1、 D2、E0、 E1、λTK： Constant (listed in the data sheet)

To determine the temperature coefficient of the relative refractive index, refer to the equation given in the previous section, “Temperature coefficient of the refractive index”.

Optical Properties
OPTICAL PROPERTIES

2.9 Internal Transparency

Internal transparency〔λ0.80/λ0.05〕

As a simplified indicator of coloring, the wavelength values in nm at which
the internal transmittance of a 10 mm thick glass sample is 0.80 and 0.05
are indicated.

Optical Properties
OPTICAL PROPERTIES

2.8 Coloring

Coloring

Coloring refers to the degree of coloration of the optical glass and is determined by measuring the spectral transmittance, including reflection losses, for a glass sample with a thickness of 10 mm, according to JOGIS-02. From the spectral transmittance curve (Fig. 3), the wavelengths showing the transmittance of 80% and 5%, respectively, are rounded and displayed in 5 nm units. We use this rounding method: the range 0 nm to 2 nm counts as 0 nm, the range 3 nm to 7 nm counts as 5 nm, the range 8 nm to 10 nm counts as 10 nm . For example, if the wavelength with 80% transmittance is 403 nm and the wavelength with 5% transmittance is 357 nm, the coloring is shown as 405/355.

Optical Glass Coloring

For glass types with a high refractive index, nd ≥ 1.84, the reflection loss is large, so the wavelength showing transmittance of 70 % is used, instead of 80 %, and the value is shown in paranethesis. For example, (415).

Optical Properties
OPTICAL PROPERTIES

2.10 CCI (Color Contribution Index)

CCI

CCI (Color Contribution Index) is an index for predicting how much the color of a photograph taken using a certain lens system changes compared to the original color, due to the spectral characteristics of the lens. It is indicated by a set of 3 numbers for blue (B) / green (G) / red (R). Ohara uses this index to predict how much the color will change as a single glass element. For the measurement method, refer to JIS B 7097 “How to express the color characteristics of a photographic lens by the ISO color characteristic index (ISO / CCI)”. The numbers shown are calculated using the sum of the values of the internal transmittance of the glass sample every 10 nm and the average color film weighted spectral sensitivity, described in JIS. For example, B / G / R of 0/3/5, is shown in Fig. 4 in trilinear coordinates.

CCIE
Optical Properties
OPTICAL PROPERTIES

2.1 Refractive Index

Refractive Index

When light enters the glass, it slows down inversely proportional to the refractive index compared to in a vacuum or in air. The refractive index of optical glass is usually expressed as the speed ratio of light in the air to themedium (glass sample).

The refractive index is measured by sending a predetermined wavelength of light into the sample and measuring theminimum deviation angle of the emitted light bent by refraction, according to JIS B 7071-1. For the 20 spectral lines shown in the table below, numerical values are shown to five decimal places. The refractive indices (principal refractive indices) for d-line (587.56 nm) and e-line (546.07 nm) are also shown to six decimal places.

Spectral Line Symbol t
Light Source Hg Hg Hg Hg Hg
Wavelength (nm) 2325.42 1970.09 1529.58 1128.64 1013.98
Spectral Line Symbol s A′ r C C′
Light Source Cs K He H Cd
Wavelength (nm) 852.11 768.19 706.52 656.27 643.85
Spectral Line Symbol He-Ne D d e F
Light Source レーザー Na He Hg H
Wavelength (nm) 632.8 589.29 587.56 546.07 486.13
Spectral Line Symbol F′ He-Cd g h i
Light Source Cd レーザー Hg Hg Hg
Wavelength (nm) 479.99 441.57 435.835 404.656 365.015
Optical Properties
OPTICAL PROPERTIES

2.2 Dispersion and Abbe Number

Dispersion and Abbe Number

Dispersion refers to the phenomenon arising from a variation in the refractive index depending on the wavelength. Here, nF-nC and nF’-nC’are displayed as the main dispersion. The Abbe number is an index of the magnitude of the variance and is also called the inverse dispersion rate. The larger the variance, the smaller the Abbe number.

Abbe Numbers Calcuation

The glass type data sheet indicates the dispersion, calculated from the refractive index to six decimal places . Abbe number is indicated to two decimal places, this is the result of the calculation from nd to six decimal places and the principal dispersion to six decimal places .

Two decimal places: This is the result of calculation from nd to six decimal places (with seven effective digits) and the principal dispersion to six decimal places (with four or more effective digits).

Optical Properties
OPTICAL PROPERTIES

2.3 Partial dispersion ratio and anomalous dispersion

Partial dispersion ratio 〔θx, y〕 and anomalous dispersion 〔Δθx, y〕
Anomalous dispersion refers to how far away a glass is from the trend line between the partial dispersion ratio θx, y = (nx-ny) / (nF-nC) for wavelengths x and y and the Abbe number νd. In optical design, glass with anomalous dispersion is required to enable color correction of the secondary spectrum.
Therefore, we have released the θg, F-νd diagram and the θC, t-νd diagram as means to show the relationship between θx, y and νd of each glass type. In order to numerically express the anomalous dispersibility, 511605 (NSL 7) and 620363 (PBM 2) are used as reference glasses, and the straight line connecting these two glass types is considered the “normal” line. The difference between the “normal” line and the vertical coordinates θx, y of each glass type is calculated as anomalous dispersion Δθx, y (Fig. 2). In this catalog, the partial dispersion ratio is θg, F and θC, t, and the anomalous dispersion is Δθg, F and ΔθC, t.

Although NSL 7 and PBM 2 are not currently produced by Ohara, the conventional NSL 7 and PBM 2 values ​​(Table 2) are used as the reference values.

Reference Values
θc,t
θC,A'
θg,d
θg,F
θi,g
vd
NSL 7
0.8305
0.3492
1.2391
0.5436
1.2185
60.49
PBM 2
0.7168
0.3198
1.2894
0.5828
1.4214
36.26

>θg,F-νd図とΔθg,F

2.3 Chart
Optical Properties
OPTICAL PROPERTIES

2.4 Disperson Formula Constant

The refractive index for wavelengths not listed in the data sheet can be calculated using the dispersion formula. The Sellmeier equation is used as a practical dispersion formula, as detailed below.

Sellmeier Equation
n ： Refractive index to be calculated
λ ： Arbitrary wavelength (μm)
A1、A2、A3、B1、B2、B3 ： Constant (listed in the data sheet)

Using this dispersion formula and the constants for each glass type, the refractive index of any wavelength in the standard measurement wavelength range (365 to 2325 nm) can be calculated with a calculation accuracy of ±5×10<sup>-6</sup>. However, for glass types for which the refractive indices for the entire standard measurement wavelength range are not listed in the data sheet, the applicable wavelength range of the dispersion formula is limited to the refractive index range listed in the data sheet.

Optical Properties