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Robert
Winsor
I am looking for a small quantity (roughly 10 cubic inches) of each of a few different types of glass - in raw, "glass slabs" or "glass strips" form. I see the materials on your website, but I do not see how to place an order. Can you please advise? If my quantity is too small, can you refer me to a vendor through which I can source these materials? I need these for special experiments I am trying to perform involving TIR, so I will be experimenting with various angles.
1
Angel
Kath
Regarding your product WMS-15(CTE114), Would you please let us know the price and lead time. Thanks a lot.
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Michaelslode
Michaelslode
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Nathan
Esham
Hello, I am looking to get QTY 3 of 2.5" diameter by 0.125" thick S-BSL7 coupons, finished in 320 grit or equivalent. Thanks, Nathan Esham
1
Benoit
AVRIL
Hello, I am searching for about 1000 transparent balls of a diameter around 10 mm whose refractive index would be fairly high (between 1.8 and 2). I am not searching for a very high precision finish. A material like L-LAH94 looks interesting. The Abbe number should ideally be as high as possible but the main requirement is about the refractive index and the price, I am not really bothered by the dispersion. Could you provide a quote? Best regards.
1
RAJKUMAR
POLAVENI
Dear galvoptics, I would like to request a quotation for raw fused silica 7980 0A grade blocks for our optical engineering and R&D team. Required Material Specifications: Item Dimensions (L × W ) Thickness Quantity Material Grade 1 200 mm × 200 mm 20 mm 3 Nos. Fused Silica 7980 0A Grade 2 40 mm × 40 mm 20 mm 4 Nos. Fused Silica 7980 0A Grade Material Requirements: Material: Corning 7980 HPFS® 0A Grade Transmission Range: 1064–1080 nm wavelength (>98% at 1064–1080 nm) Purity: ultra-high purity, practically bubble-free Surface finish: Six sides of the optical blanks are finely ground. Edge chamfering is required to minimize edge chipping Preferred chamfer:0.5mm X 45 Degree on all edges Required Information in RFQ: Best available price (including any R&D discounts) Lead/delivery time (Pune location, Maharashtra) Warranty and support terms
1
RAJKUMAR
POLAVENI
Dear OHARA, I would like to request a quotation for raw fused silica 7980 0A grade blocks for our optical engineering and R&D team. Required Material Specifications: Item Dimensions (L × W ) Thickness Quantity Material Grade 1 200 mm × 200 mm 20 mm 3 Nos. Fused Silica 7980 0A Grade 2 40 mm × 40 mm 20 mm 4 Nos. Fused Silica 7980 0A Grade Material Requirements: Material: Corning 7980 HPFS® 0A Grade Transmission Range: 1064–1080 nm wavelength (>98% at 1064–1080 nm) Purity: ultra-high purity, practically bubble-free Surface finish: Six sides of the optical blanks are finely ground. Edge chamfering is required to minimize edge chipping Preferred chamfer:0.5mm X 45 Degree on all edges Required Information in RFQ: Best available price (including any R&D discounts) Lead/delivery time (Pune location, Maharashtra) Warranty and support terms
1
Margherita
Murrone
Hello, We would like to request a quotation for the supplies of a Custom Optical Glasses to our specifications. Please refer to the attached document for detailed information on our project requirements and technical specifications. I kindly ask that you confirm receipt of this email and advise on your procedures for working with us. I appreciate your time and look forward to your response.
Tide
Bank
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Alpesh
Patel
What's the cost to get a raw glass for making a 6 inch telescope mirror glass, I just need a glass that I'll do in house coating. I am from india
1
kirstin
anderson
subject: S-BLS7 / 516641,S-LAL9 / 691-548,S-TIM2 / 620363 Good morning, I am chasing up on an information request email I sent back in December in regards to the above parts. Have you had a moment to look at these at all? I had requested the production status of these parts, are they still active? and also any ROHS and REACH information they may come with. Many thanks
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Marie
Goldstar
Hi – Good day to you! I’m reaching out to see if you’d be interested in acquiring the verified attendees email list for the SPIE Optics + Photonics 2026. The list includes complete contact details of optical engineers, photonics researchers, laser technology specialists, imaging scientists, product developers, R&D leaders, academic professionals, and other key decision-makers attending the event. If interested, I can share the attendee count, pricing details, and a sample file for your review. Best regards, Marie Goldstar Marketing Coordinator
Keerthana
Sivasankar
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CharlesNuS
CharlesNuS
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Emily
Zhou
Hello OHARA Sales Team, My name is Emily from Mani LLC. We are currently evaluating OHARA optical glass materials for a lens-related project and would like to connect with the appropriate sales representative. We are interested in several OHARA glass types, including S-TIH6, S-TIH53W, S-TIM35, L-LAH85V, S-LAH89, S-NBH5, S-FPM2, S-NBM51, and related optical glass materials. At this stage, we would like to understand availability, MOQ, lead time, and preliminary pricing for possible 4K / 10 mm and 4K / 5 mm requirements. Could you please advise whether these materials can be supplied as glass blocks, cut blanks, or lens blanks, and let us know what specifications are needed for an accurate quotation? We would appreciate it if a sales representative could contact us so we can share the full material list and project details. Thank you, Emily Zhou Procurement Specialist Mani LLC
Ben
Co
I am a Global Supply Chain Manager from Helion Energy in the US. We are working on a fusion generator, you can visit our website for more information (www.helionenergy.com). We are interested to explore your materials to use in our generator. Can you please let me know who would be the right person to contact in your company? Also, we need to get a mutual NDA in place, can you please provide the following information? • Company's Legal Name • Company Address • Is this a US based company? • Name of company's authorized signer • Title of authorized signer • Email address of authorized signer Thank you very much,
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Jacob
Florian
We are interested in purchasing small quantities of your LiCGC Sp-01 membranes to test as solid electrolytes for a lithium extraction project. Could you please let us know the prices for the different sizes in your catalog? We are interested in the 19 mm diameter disks. Thanks! Jacob
Andrea
Bulmer
Hi, I'm following up to see if you're interested in purchasing the attendee email list for the Optics & Photonics - SPIE 2026 at a discounted price. If you are, please reply with - "Send Price." Thank you, Andrea Bulmer
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Randall
Hanna
Looking for quote for QNTY:3 283x88x10mm rough ground FS plates with edge break.
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Paul
Eldridge
I am looking to sell a window that my father acquired from when he worked at Corning Incorporated. Below is the confirmation of this piece of fused silica: From Corning Incorporated Engineering: “The window appears to be a fused silica Space Shuttle window, made in Canton, NY. The marking on the side includes the part number, but the actual serial number is missing at the end of the marking. It was never flown, and was a reject." These windows were made in Canton from the 1970s through the early 2000s. This one is fused silica, made in Canton, as seen by “7940” in the part number string, which is the sales code for our fused silica. This is consistent with the XRF spectrum.” XRF Analysis: Alfred University used a portable XRF and determined that the major peak collected is from silicon, with no peak from aluminum. Small peaks from iron and nickel could be produced by back scattering from the XRF mask, and a rhodium peak from the x-ray tube. After a little research on the value of this was anywhere between $84k and $40k. This piece is 3/4" thick and roughly 2.5 square feet in size. The only authenticity is from the response from Corning Inc. Engineering.
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Jim
McGuire
What is the maximum standard size for S-TIH11 blanks?
1
OPTICAL PROPERTIES

2.5 Temperature Coefficient of Refractive Index

Temperature coefficient of refractive index 〔Δn relT

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

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

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

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

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
(λ,T0) Refractive index at reference temperature
0 Reference temperature (°C) (Ohara defines this as 25°C)
T: Target temperature (°C)
λ: Vacuum wavelength (μm)
D0D1 D2E0 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

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

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

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

2.9 Internal Transparency

Internal transparency〔λ0.800.05

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

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, Fd diagram and the θC, td 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

g,Fd図とΔθg,F

2.3 Chart