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Staceysak
Staceysak
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1
Soumyajit
Samal
I want to order LICGC polished substrates.
Casper
Tan
need a glass block for measurement machine at high temperature of 300degrees with minimal changes to its CTE
1
Thank you very much for your inquiry We appreciate you 6174469 https://youtube.com faceapple !
Thank you very much for your inquiry We appreciate you 6174469 https://youtube.com faceapple !
1
Abigail
Houser
I would like a quote for 2, 19.0 mm DIA x 45 um thick LICGC SP-01 Sintered Plates. Thank you!
Gabrielle
Marie
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Changan
Lu
Hello, could you please provide a quotation for SP-01, measuring 25.4 mm × 25.4 mm and 150 µm thick, with pricing for different order quantities? Please also include the minimum order quantity, lead time, and shipping cost to Singapore. Thank you.
Si-woo
Choi
Hello, We are interested in your products and would like to receive your latest catalogue and any other product information you have. We also have a project we would like to discuss with your team and see if there is a way for us to work together. We would like to arrange a short Zoom or Microsoft Teams meeting to talk about it. Please let us know when you are free. Thank you. Si-woo Choi
Mikayel
Musheghyan
Dear OHARA, I am an optical engineer developing an interactive glass map as a personal project. The tool lets designers compare optical glasses across manufacturers. I plan to release it free of charge as open-source software (code under the GNU AGPLv3). The application uses the optical glass catalog data published on your website (https://oharacorp.com/glass-catalog/). A copy of the tabulated values would be bundled with the hosted application and with the public source repository. The data would remain OHARA's property and it would be clearly credited to OHARA. Could you confirm in writing that OHARA permits redistribution of this catalog data under these conditions? If you require a specific attribution notice or other terms, I will include them. A preview is available at https://glamac.optics-design.com/ using a temporary review account: Username: OHARA Password: d/7grGX)J,wjQ|[g$q.Uw;Rl;C+ Thank you for your time. Best regards, Mikayel Musheghyan
Mariel
Ledesma
Good afternoon, To ask if your product is an ultra clear soda-lime silicate (Without or smallest quantity of Iron). I'm looking for a glass with low iron content and low Tg. I have seen the datasheet but I don t see the crystallization temperature. Is it possible to fabricate a fiber with your glass without crystallization§ . Thank you in advance for your support. Mariel L.
Anderson
Ling
Dear Team, I hope this message finds you well. I’m Anderson Ling from Asobar Trading Inc, and we’re currently exploring new product solutions for our upcoming projects. Could you please share your product catalogue (if available) along with any relevant technical specifications or pricing guidelines? Looking forward to your response. Best regards, Anderson Ling Asobar Trading Inc
Kolos
Kerekgyarto
Hello, I would like to get a quote for qty. 2 of S-BSL7 optical grade glass. Is this the equivalent of Schott N-BK7 ? 1.25" thick, 5.5" x 24.063". R0.375" radius on corners and chamfered edges. All tolerances ± 0.0625in. I can send a drawing. Regards, Kolos Kerekgyarto
Jacky
Zhou
Materials - Apply for being your Supplier Hi sir, This is Jacky from Changsha Raytek Technology Co., Ltd., and I learn that your company is a leading manufacturer of optical glass. And we are a professional supplier for chemicals materials. And we assume that you would need our materials of Nb2O5. I will send the TDS and COA for your reference upon request. We hope to apply to become your supplier.
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Thank you very much for your inquiry We appreciate you 9439293 https://youtube.com faceapple !
Thank you very much for your inquiry We appreciate you 9439293 https://youtube.com faceapple !
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Pamela
Bowlan
Hello, I am in the laser science department at the LCLS at SLAC National Accelerator Lab. We are redesigning our prism pulse compressors and need to find a higher grade of UV fused silica to avoid radiation damage from our high power UV laser pulse train (you may have spoken to one of my colleagues at Photonics West). For now our request is to get polished windows of a high grade UV fused silica for damage testing. WE would want those to be 1'' in diameter and 5 mm thick (or size/thickness requirements are flexible) and precision polished for 257 nm light. Can you supply this and if yes please send a quote with lead time. For this intial test we hope to be able to get material relatively quickly. Thank you. Pamela Bowlan
1
Michael
Tuohy
Hi, Looking for price and lead time for the following: WMS-15 76.2 mm diameter +/- 0.127 mm thickness: 1.0 mm +/- 0.1 mm surface quality: 40/20 wedge < 0.025 mm surface flatness, 1 wave @ 633 nm, irregularity 0.050 wave RMS over central 25.4 mm diameter Qty: 10, 50, 100 Sincerely, Mike Tuohy Materion ph: 978-392-3842
1
Mohammed
Ubaid
Hi, I am Mohammed Ubaid from Al Khalili United Enterprises LLC. We are interested in your products, please kindly email us your updated catalog with price lists for our review. Once accepted, we will send our specifications with purchase order for immediate trial order. I look forward to your prompt response so we can proceed. Sincerely, Mohammed Ubaid E-mail: mohammed.ubaid@alkhalill.com
Jarno
Reuna
Dear Sir/Madam, We're a Finnish optical coating company providing customized filters and coatings per customer specs. We got an inquiry of filters on your Ohara WMS-15 substrates, and I can't find its optical properties listed online similar to your typical optical glasses. So, is it possible to obtain the optical data of WSM-15 from you? And secondly, is the WSM-15 suitable for filters around the wavelength of 900 nm? We're not a substrate manufacturer, so we'd source the ready substrates from outside, but am I correct that you don't manufacture optical components besides flat substrates? Especially when we're dealing with relatively small batch sizes. Best regards, Jarno Reuna, CEO, OCRICOM Oy, https://ocricom.com Business ID: 3394689-8 jarno.reuna@ocricom.com +358405528431 Tekniikankatu 1, D132, 33720 Tampere, Finland
Mohammed
Ubaid
Hi, I am Mohammed Ubaid from Al Khalili United Enterprises LLC. We are interested in your products, please kindly email us your updated catalog with price lists for our review. Once accepted, we will send our specifications with purchase order for immediate trial order. I look forward to your prompt response so we can proceed. Sincerely, Mohammed Ubaid E-mail: mohammed.ubaid@alkhalill.com
Abdelrhman
Abdelrazek
Dear, Kindly we need an offer for specific design for fused silica, kindly share your email to share the design
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
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
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