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Jenny
Schippmann
Dear ladies and gentlemen I wanted to ask you if you have any free items, samples, caps, badges, city emblems or promotional items. I would be very happy, even if it was just a postcard. More about me: I am 45 years old, have a 11 year old son and work in cleaning. I'm a big fan of the USA, especially Texas, but unfortunately I can't travel there myself. Sorry for my bad English. Thank you in advance and I would be very happy to hear from you. Yours Adress: Jenny Schippmann Lindenweg 7 03222 Luebbenau Germany
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Mariam
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Jason
Ridgway
Hello, Following our review of your brochure, we are interested in exploring a potential partnership with your organisation. Kindly connect us with the appropriate sales representative so that we may discuss our product requirements and request a detailed quotation. Thank you for your assistance. Best regards.
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Anne
Roa
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Anatoli
Kuchalinau
Good afternoon! We ask You to provide us commercial proposal for delivery of the following equipment: 1. Glass Ohara WMS-15 d6”(150 mm) – 10 pcs. The glass thickness is 10 mm. Dimensional tolerance is 0.1 mm. Purity class 20-10, surface roughness <2A, N<0.5 dN<0.1 Wedge angle <10'' Waiting for your offer. Best regards, Anatoliy PREMA S.A. Oddział Białystok ul. Wysockiego 150 15-167 Białystok
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Marc
Bertrand
Hello, I am interested in your LIGC SP-01 Membranes and I would like some more information. I would like to add a composite on top of the membrane and then heat at high temperature (700 to 900ºC). Is the membrane will be stable or not in this range of temperature? If yes how much will it degrade? Also, as I would also like to deposit thin films on the membrane, can you share information about the overall relative density and the rugosity of the surface? Thank you a lot, Best regards, Marc BERTRAND
Richard
Collins
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Jared
Monce
Interested in buying blank flats of the following materials: S-LAH53, S-TIH6, S-PHM53. Ideal size is 1 inch diameter, 5 mm thick. QTY 4 of each.
Nir
Pony
I hope you're doing well. I have a technical question regarding material selection for an aspheric LED lens design.   I am currently facing manufacturability challenges with conventional machining methods and am therefore evaluating molded glass options, including Ohara S-BSL7/L-BSL7   When I set L-BSL7 as the material in Zemax, I encounter an issue because the available refractive index data only extends down to 0.365015 µm, where the refractive index is listed as 1.53547. However, the datasheet also provides transmission data at 340 nm: https://oharacorp.com/wp-content/uploads/2025/04/elbsl07.pdf   To continue my analysis, I estimated the refractive index at 340 nm to be approximately 1.5412 based on extrapolation from the available data.   My primary objective is to determine whether L-BSL7 is a viable material for operation at 340 nm and whether my refractive index assumption is reasonable for optical modeling purposes. Do you see any concerns with this extrapolation approach, or any potential issues with using this glass at 340 nm?
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Anna
Main
We are updating our records and would like to know what the expiration data is for you ISO 9001:2015 certificate. Regards, Anna Main Quality Manager Thorlabs Lens Systems
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Kaiyang
Diao
Hi there, My name is Kaiyang Diao, and I am a PhD student in the Laboratory of Space Systems and Optomechanics under Professor Felipe Guzmán. I am interested in purchasing a CLEARCERAM base measuring 0.85 m × 0.85 m × 0.03 m. Could you please provide a quote and estimated lead time for both the standard and HS versions? Please let me know if you need any additional information. Thank you for your time and assistance! Best regards, Kaiyang Diao
Jerry
Cabak
Interested in some small pieces of S-NPH2 or some samples. Would like to know what options are available.
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kirstin
anderson
good morning, i am doing obsolescence monitoring on a number of parts and have come across parts S-BLS7 / 516641, S-LAL9 / 691-548, S-TIM2 / 620363 which i cannot seem to find availability for are you able to help with this please
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Brad
Hess
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Michael T. Rearick
Rearick
Hello, I am reaching out to inquire about your company’s services and would appreciate your prompt response at your earliest convenience. We are interested in exploring how your offerings may align with our needs and look forward to the opportunity to connect. Thank you, and I look forward to your reply.
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Florencia
Petracci
Hi, I was interested in your LiCGC SP-01 membranes. We currently use the polished AG-01 substrates in our experiments as a substrate for thin film samples, but want to switch due to the notice of discontinuation. Could you tell me the surface roughness of the new SP-01 membranes? And what the price of a 150 um thick membrane is? Thank you!
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