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Madelaine
Dolich
I would like to get a description of membrane sizes of the SP01 membranes offered, and price options.
ANTONIO
BISCEGLIA
I'm interested to buy a mirror for telescope Ritchey Chretien diameter 800 mm F6
1
Ashwani
Kaul
Radiation Hardened Glass Wafer , Equivalent to BK718 Daimeter : 100mm +/- 1mm Both side Polished wavelength Range : 400 - 850 nm Surface Quality : 40- 20 (Scratch and Dig)
Jessica Snyder
Jessica Snyder
Hi there, I'm Jessica, your Account Success Manager on the account. I've created a personalized welcome page for your business that outlines how our secondary customer financing program helps contractors approve more home improvement projects - with absolutely no per-loan fees, extra work, or risk to your business. Here are 5 reasons contractors choose this program: 1- No merchant financing fees - avoid the 5-15% charged by traditional programs 2- FICO approvals as low as 500 - a backup option for homeowners who don't qualify through primary lenders 3- No switching required - works alongside your current financing options 4- No added work for your team - no training or process changes 5- Zero risk to your business - no recourse, no liability Feel free to view your business's custom financing welcome page here: Ohara corporation Custom Welcome Page hrdealerfinancing.com/?a=Ohara-corporation Happy to walk you through it once you’ve had a chance to review. Best, Jessica Snyder  HelloRates Customer Financing  Partner Success Team  Trusted by 13,000+ Contractors for Their Prime & Subprime Customers 12
1
Jeffrey
Kowalski
Hello, For your lithium ion conducting ceramics, what is the area and thickness that you are able to produce (interest in thin with a larger area)? Also, do you sell sodium ion conducting ceramics as well? Thank you for any information you can provide. Jeff Kowalski
1
Margherita
Murrone
To whom it may concern. Warm Greetings! We are requiring your services for a Custom SK-1310 Model, Fused Silica, you can review the attached spec details already provided. I kindly ask that you confirm this email by stating what the procedures are for working with us. I appreciate your time and look forward to hearing from you.
1
Nikita
Lipov
Dear Sir or Madam, My name is Nikita Lipov and I represent Pythagoras International Supply Co., Ltd. We are currently sourcing ultra-low thermal expansion glass substrates for precision optical mirrors used in a temperature-stabilized optical system. Due to procurement constraints in this project, Corning ULE glass cannot be used, therefore we are evaluating alternative materials with equivalent thermo-mechanical performance. We would like to ask whether your materials could meet the following specifications. Mirror substrate material requirements: Material type Ultra-low thermal expansion glass Thermal expansion requirements • Zero crossing temperature of the coefficient of thermal expansion (CTE): within 5°C – 35°C (required) • Average CTE in the range 5°C – 35°C: from −31 × 10⁻⁹ (1/°C) to +31 × 10⁻⁹ (1/°C) Material quality requirements • Maximum inclusion diameter: ≤ 3 mm • Average inclusion density: ≤ 0.015 per cm³ • Inhomogeneity (variation) of CTE: ≤ 11 × 10⁻⁹ (1/°C) We would appreciate your technical clarification on the following points: 1. Do you manufacture materials that can meet the above CTE and homogeneity requirements within the specified temperature range? 2. If so, which material grade (for example Zerodur, ClearCeram or other variants) would be recommended for this application? 3. If finished mirror substrates are not supplied directly, could you recommend qualified optical manufacturers capable of producing custom mirrors from your material? These mirrors will be used in a high-stability optical system where thermal expansion stability and material homogeneity are critical parameters. If possible, we would also appreciate receiving relevant technical documentation or material datasheets. Thank you in advance for your assistance. Best regards, Nikita Lipov Pythagoras International Supply Co., Ltd.
Michele
Signer
Can you please provide me the MSDS of S-BAM21. Thank you
udaykumar
R
​​Dear Sir We are looking for 3 pieces, 220 mm in diameter and 20 mm thick meeting below specifications. Max temperature: Ambient temp. Max pressure: 1 bar. Media: Air. MOC of glass: Fussed Silica. Application: Laser transmission. (500mJ energy) ​Kindly send me your best offer with the data sheet at your earliest convenience.
1
Venus
Phelan
Hi I have tried DMing you on Instagram but haven't received a response. I would be grateful if you could put me in touch with the right person who handles marketing/influencers at oharacorp.com I have some influencers interested in promoting oharacorp.com on a gifted basis. Please could you also copy in our influencer relationship manager, Steven at info@mayfairpug.online Many thanks Venus Phelan mayfairpug.online
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Steven
Woelfle
Please remove my name from your mailing list. Thank you.
Benniemor
Benniemor
Все про затишок
1
Xuan Hoa
Nguyen
I am looking for Germanium windows optics for local project. Pls advise your right contact for further details
1
Jessica
Blonder
Hello, I am working in compliance and am looking for regulatory material information for the following part numbers: S-FPL53 S-LAL14 N-FK51A S-BSM4 S-BAH27 S-BSM2 S-LAH99 I am looking for a full material declaration, a REACH declaration to the latest candidate list, PFAS material content, SDS, and/or NAS411 material content. Thank you.
RodneyRiz
RodneyRiz
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Dolly_Nikki
Fan
We inquiry 0.1mmt glass in size 80x 40mm, AR coating glass with transparent 96.5% between 700nm and 1800nm
1
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Tyroneriz
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Nidish D
Keni
Subject: Enquiry for Supply of Fused Silica Dear Ohara Corporation Team, We are Minerals Processing Industry, engaged in Mining and Processing Minerals for investment casting shell systems, fused silica refractories (including zero expansion grades), technical ceramics, optics/glass, and semiconductor quartz applications. We operate our own quartz mine, supported by advanced processing units and technical collaboration with our Joint Venture partners, ensuring consistent quality and adherence to industry specifications. We would be glad to support your upcoming fused silica sand requirements. Kindly connect us with the concerned sourcing / procurement team to take this discussion forward. We look forward to your response. Warm regards, Nidish D Keni Chief Operating Officer Minerals Processing Industry Bengaluru, India mpi@mpiandco.com +91 94805 67072 mineralsprocessingindustry.com
1
Hassan
Syed
Hi, Hope you are doing well. I am reaching out to see if you have interest in purchasing Gallium 4N metal. We have 40KG on hand that can ship as early as Monday. We can also offer a weekly run-rate of 75/KG per week for the next 3 months. We will also have Germanium available as of end of next week and could assign allocation for new clients. Please let me know if Ohara Corp has any interest in procuring this material and we can further discuss. Thanks, Hassan Syed
Jerry
Cabak
Do you have CTE values to cryogenic temperatures for BaF2 and S-NPH 2? Anything you could share would be appreciated.
1
Doris
Belcher
I am reaching out on behalf of our company, a distribution and trading firm actively seeking high-quality products and equipment to introduce to our network of clients. Your offerings have come highly recommended, and we are eager to explore potential collaboration. We would appreciate details on your full range of products, pricing, specifications, and any customization options you may offer. Information regarding delivery timelines, after-sales support, and exclusive opportunities for long-term partnerships would also be highly valuable. We are excited about the possibility of working together and look forward to your response to discuss how we can bring your products to a wider market. Best regards
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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

2.10 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

2.2 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

2.6 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

2.1 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

2.4 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
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

2.9 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

2.3 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