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1
Fiorina
Shen
Good morning, Greetings from FIFO Optics China. Our team is always looking for opportunities to support companies with more flexible and efficient sourcing options, while helping optimize material planning and overall project budgets. FIFO has over 25 years of industry experience supporting MV, AOI, FA, Embedded Vision, and other industrial imaging related applications. If you feel this may be relevant to your team, I would truly appreciate your help in forwarding this message to the appropriate person or department. You are welcome to explore our website for products that may be relevant to your projects and applications: https://www.fifooptics.com/Products2026 If there is anything we may assist with, please feel free to contact us anytime at lens@fifooptics.com Thank you very much for your time, and wishing you a wonderful day. Best regards, Fiorina Shen FIFO Optics Team ****************************************************************************** 2nd Floor, B2-B08, Rongqiaojinjiang New World No.66,Jiangbin, Boulevard West, Fuzhou Fujian, 350002 P.R.China. Tel: +86-591-838-355-78 E-mail: lens @fifooptics.com Website: www.fifooptics.com ISO9001:2000 Certificate CN06/01895.1 ******************************************************************************* FIFO Optics (US Office) Email:lens@fifooptics.com Tel: +1 (925)234-4868 WhatsApp :+1 (510) 266-4020 Whechat:FIFO-Optics Connect with us:丨Instagra丨YouTube丨TikTok丨 USA Address: 4115 Blackhawk Plaza Circle, Suite 100 Danville,CA 94506 ISO9001:2000 Certificate CN06/01895.1
1
Kuravi
Hewawasam
Hello, We are looking for a refractive index measurement service for CaF2 and Fused Silica over the wavelength range 185–230 nm. If you provide that service, could you tell me: 1. What sample geometry you need (prism apex angle, dimensions, surface flatness, polish), and whether you can accept a blank. 2. Whether you can measure at a controlled temperature, or provide dn/dT 3. Typical turnaround time and an approximate cost. I'm happy to share more details about the material and the application. Thank you for your time. Best regards, -- Kuravi Hewawasam Senior Optical Engineer
Ben
Hughes
I see that S-LAH79 is no longer recommended. Our application requires spheres with refractive index close to 2 (e.g. 1.95) @ 1550 nm. S-LAH79 worked well for us. I see S-LAH99 is close to what we need. Are you able to supply precision spheres of diameter 18 mm or larger (ideally 19.05 mm)?
Jennifer
Pierce
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1
Kurt
Ricarde
Hello, we'd like to request a quote for an 18" × 18" × 1/4" OHARA SK1300 plate. It will be used to support silicon wafers during IR lamp heating, as our previous fused quartz plate shattered at 300°C. This is urgent, so please include the earliest lead time and any available expedite fees. Thank you.
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BobbyRounc
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Andrea
Bulmer
Hi, Would you be interested in purchasing attendee email list for Optics & Photonics - SPIE 2026? Data fields include: Company name, website, contact name, job title, email address, mailing address, phone number, sic code, industry type, employee size, revenue size, and more. Just revert back saying – Send pricing info with sample file? Best regards, Andrea Bulmer Event Coordinator
1
Philip
Avallone
I wanted to know if you can provide me an SK-1300 plate 18.0" x 18.0" x 0.25".
1
RocketSEONow
Team
Hi team, Would you like to see which businesses AI names for a service you offer? RocketSEONow's free check shows which businesses AI names for a trip or service. It also checks your website's SEO basics and suggests practical next steps. You can see the results without leaving an email. You can check oharacorp.com here: https://rocketseonow.com/ai-check/oharacorp.com Travel SEO is our focus; other businesses are welcome too. If you want help with the results, the page opens a prefilled email or WhatsApp message. Kind regards, RocketSEONow Team Not interested? Reply no and we will stop contacting you.
Abby
Marchuk
Hi, we’re currently casting for Season 2 of *Now We Know* on CNBC and are interested in featuring Ohara United States and its advanced optical glass manufacturing. We’d love to explore how specialized glass is engineered to manipulate light and used in precision lenses, imaging, and optical technologies. Could you connect me directly with your CEO, president, or another senior executive for a brief introductory conversation about a potential feature?
Gabor
Kemeny
Please quote 6 pc CaF2 circular windows Diameter:44.45mm(1.75"), approx 1 - 1.5mm thick.
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Nick
Tseng
Hi sir i am Himax MC. Our RD/engineer are interesting in your product-OHARA WMS-15 4-inch: Diameter 95 mm, Thickness 10 mm 6-inch: Diameter 150 mm, Thickness 10 mm could you provide the contact window of Taiwan, we may discuss with him.her and have the quote, thanks.
Alex
Simms
Hi, I'm Alex, a junior space systems engineer at a company called Foundational Space. I'm looking to procure a transparent window to help protect a space based optical sensor. The optical sensor works with 1550nm lasers and must have a window of size 50mm by 50mm (and the thickness can be decided later). I'd like the window to block UV radiation and potentially give some protection against higher energy radiation and also not turn brown over time. Would we be able to discuss options that could fit my project?
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1
Senega
Iles
I'm sourcing materials and related services for an upcoming project and would like to learn more about what your company offers. Please reach out by email with your product offerings, services, pricing, and availability so we can discuss next steps.
1
Shaoping
Lu
We are evaluating optical glass materials for the front lens of a high-NA fluorescence microscope objective used for single-molecule detection. We used S-LAH55V for the objective front lens material, which produces high autofluorescence background. We are searching low autofluorescence Ohara glass for new objective design. We are particularly interested in S-FPM2, which has low autofluorescence at 436 nm and 546 nm, and relatively high refractive index. We had your optical glass fluorescence data measured under 436 nm and 546 nm excitation measured in 2014. But our microscope uses excitation wavelengths of 488 nm, 532 nm, and 642 nm. We found glass autofluorescence strongly depend on excitation wavelength. We are particularly interested in the fluorescence emission spectra of OHARA optical glasses under 488 nm and 532 nm excitation. Could you please let us know whether OHARA has existing fluorescence measurement data at either of these excitation wavelengths? Thank you very much for your help!
1
Billylap
Billylap
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1
Kostas
Zafiriou
Do you have a glass comparable to Schott BK7G18? Thanks.
Simon
Tsaoussis
Hi, I was wondering if you have the specific heat for all of your glasses? It would be very helpful. Thanks, Simon Tsaoussis
Fiorina
Shen
Good morning, Greetings from FIFO Optics China. Our team is always looking for opportunities to support companies with more flexible and efficient sourcing options, while helping optimize material planning and overall project budgets. FIFO has over 25 years of industry experience supporting MV, AOI, FA, Embedded Vision, and other industrial imaging related applications. If you feel this may be relevant to your team, I would truly appreciate your help in forwarding this message to the appropriate person or department. You are welcome to explore our website for products that may be relevant to your projects and applications: https://www.fifooptics.com/Products2026 If there is anything we may assist with, please feel free to contact us anytime at lens@fifooptics.com Thank you very much for your time, and wishing you a wonderful day. Best regards, Fiorina Shen FIFO Optics Team
1
TheSparkSEO
Team
Hi, For the website or marketing team at oharacorp.com: If SEO is on your agenda, we can prepare a free report with clear priorities for your website. It covers the pages to prioritise, search visibility issues to review, and practical next steps. You can start with a free quick audit of your website here: https://thesparkseo.com/audit/oharacorp.com For the detailed report, reply "report". You can include a priority product or service so we can focus the review. We normally send requested reports within 24 hours. TheSparkSEO Team thesparkseo@gmail.com If this is not relevant, reply "no" and we will not contact you again.
Christopher
Maher
I'm looking for non-browning cerium-oxide-doped, glass close to 0.25" thick for a Ø3.25 window. Please advise which of your products best matched this description. Thank you.
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