Edmund Optics uses cookies to optimize and enhance the features and content on our website. Click “OK” for the full user experience, you can view additional information on the cookies we use by clicking the “Details” button. We do NOT sell your information from marketing cookies, we use it to improve ONLY YOUR experience with Edmund Optics.
Some of the data collected by this provider is for the purposes of personalization and measuring advertising effectiveness.
Some of the data collected by this provider is for the purposes of personalization and measuring advertising effectiveness.
Cookies are small text files that can be used by websites to make a user's experience more efficient.
The law states that we can store cookies on your device if they are strictly necessary for the operation of this site. For all other types of cookies we need your permission.
This site uses different types of cookies. Some cookies are placed by third party services that appear on our pages.
You can at any time change or withdraw your consent from the Cookie Declaration on our website.
Learn more about who we are, how you can contact us and how we process personal data in our Privacy Policy.
Please state your consent ID and date when you contact us regarding your consent.
Most web browsers allow you to view your cookies in the browser preferences, typically within the "Privacy" or "Security" tab. Some browsers allow you to delete specific cookies or even prevent cookies from being created. While disallowing cookies in your browser may provide a higher level of privacy, it is not recommended since many websites require cookies to function properly. Alternatively, you can visit www.aboutcookies.org which provides directions on how to block or delete cookies on all major browsers.
A retarder can be used at a different wavelength than the design wavelength and still maintain its phase, if it is tilted about its fast or slow axis. If tilted about the fast axis, the design wavelength can only be changed to a shorter wavelength. If tilted about the slow axis, the design wavelength can only be changed to a longer wavelength. To determine the amount of tilt required, use the following equation:
θ = sin-1 (λnew / λdesign) , where
θ = the angle on the output side of the retarder from the optical axis to the back surface of the retarder
Example: If a ¼λ retarder is tilted about the fast axis and it is designed at 1064nm, then it can still be used as a ¼λ retarder for a 670nm source if it is tilted by 39 degrees.
If on the other hand the retarder is not tilted and a wavelength other than the design wavelength is used, there will be a phase shift. A ¼λ retarder has a phase shift of 90°. A ½λ retarder has a phase shift of 180°. To determine the amount of the phase shift, use the following equation:
δ = 360° (Δ n τ / λ ) , where
δ = the retardation angle
Δ n = the birefringence factor
τ = the thickness of the sheet
λ = the wavelength of light
Example: For a ¼λ retarder, since the phase shift (δ ) is 90°, Δ nτ = ¼ = 140nm (for λ =560nm). So if a source at 850nm is used for a ¼λ retarder with a design wavelength of 560nm, then δ = 360° multiplied by (140nm/850nm)= 59.29°. Solving now for Δ nt is (δ λ / 360°)= λ (59.29° / 360°) = 0.165λ » λ /6, the phase shift.
or view regional numbers
QUOTE TOOL
enter stock numbers to begin
Copyright 2023 | Edmund Optics, Ltd Unit 1, Opus Avenue, Nether Poppleton, York, YO26 6BL, UK
California Consumer Privacy Acts (CCPA): Do Not Sell or Share My Personal Information
California Transparency in Supply Chains Act