RP Photonics logo
RP Photonics
Consulting Software Encyclopedia Buyer's Guide

Short address: rpp-con.com

Dr. Paschotta, the founder of RP Photonics, supports your R & D with his deep expertise. Save time and money with efficient support!

Short address: rpp-soft.com

Powerful simulation software for fiber lasers and amplifiers, resonator design, pulse propagation and multilayer coating design.

Short address: rpp-enc.com

The famous Encyclopedia of Laser Physics and Technology provides a wealth of high-quality scientific and technical information.

Short address: rpp-bg.com

In the RP Photonics Buyer's Guide, you easily find suppliers for photo­nics products. As a supp­lier, you can profit from enhanced entries!

Learn on lasers and photonics every day!
VL logo part of the

White Light Interferometers

<<<  |  >>>  |  Feedback

Buyer's Guide

4 suppliers for white light interferometers are listed.

Among them:

NKT Photonics

SuperK supercontinuum lasers with continuous output from 400 to 2400 nm: low-coherence output, very suitable for WLI applications

Your are not yet listed? Get your entry!

Ask RP Photonics for advice on how to measure the dispersion of dielectric mirrors or other components with a white light interferometer, what sets the noise limits, etc.

Definition: interferometers using broadband light inputs

German: Weißlichtinterferometer

A white light interferometer, used e.g. in the context of low-coherence interferometry, is an interferometer, typically a Michelson interferometer, which works with a white light source, i.e. with a light source with broad optical bandwidth. The light source does not necessarily operate in the visible spectral range, really generating white light. Its temporal coherence has to be fairly small, whereas a high spatial coherence is normally needed. The high spatial coherence combined with a broad bandwidth can most easily be obtained by launching light from a bulb into a single-mode fiber, but this leads to a very small launched power. The radiance (brightness) can be increased by many orders of magnitude by using a superluminescent source such as a superluminescent diode. In some cases, wavelength-swept tunable lasers are used.

The detector in a white light interferometer can either be a photodetector which integrates contributions of different wavelengths and records the signal in the time domain, or a spectrometer (spectral interferometry).

Application of White Light Interferometry

White light interferometry is used for different purposes. The main applications are:


[1]K. Naganuma et al., “Group-delay measurement using the Fourier transform of an interferometric cross correlation generated by white light”, Opt. Lett. 15 (7), 393 (1990)
[2]M. Beck and I. A. Walmsley, “Measurement of group delay with high temporal and spectral resolution”, Opt. Lett. 15 (9), 492 (1990)
[3]A. P. Kovacs et al., “Group-delay measurement on laser mirrors by spectrally resolved white-light interferometry”, Opt. Lett. 20 (7), 788 (1995)
[4]S. Diddams and J.-C. Diels, “Dispersion measurements with white-light interferometry”, J. Opt. Soc. Am. B 13 (6), 1120 (1996)
[5]C. Dorrer et al., “Experimental implementation of Fourier-transform spectral interferometry and its application to the study of spectrometers”, Appl. Phys. B 70, S99 (2000)
[6]Q. Ye et al., “Dispersion measurement of tapered air–silica microstructure fiber by white-light interferometry”, Appl. Opt. 41 (22), 4467 (2002)
[7]A. Gosteva et al., “Noise-related resolution limit of dispersion measurements with white-light interferometers”, J. Opt. Soc. Am. B 22 (9), 1868 (2005)

See also: interferometers, coherence, dispersion, white light sources, Spotlight article 2008-02-22

Categories: metrology, photonic devices

How do you rate this article?

Your general impression: don't know poor satisfactory good excellent
Technical quality: don't know poor satisfactory good excellent
Usefulness: don't know poor satisfactory good excellent
Readability: don't know poor satisfactory good excellent

Found any errors? Suggestions for improvements? Do you know a better web page on this topic?

Spam protection: (enter the value of 5 + 8 in this field!)

If you want a response, you may leave your e-mail address in the comments field, or directly send an e-mail.

If you like our website, you may also want to get our newsletters!


Have you seen the
RP Photonics Buyer's Guide?

It lists many hundreds of suppliers for photonics products, and is just one mouse click away from the extremely popular Encyclopedia of Laser Physics and Technology:

Our Buyer's Guide is what you need:

And surely you will remember where to find this useful resource again!

Suppliers: get your free entries, and enhanced visibility with paid entries.

Tutorials on Fiber Optics

See our tutorials "Passive Fiber Optics" and "Fiber Amplifiers" – two very comprehensive and useful resources!


Free Fiber Optics Software!

RP Fiber Calculator software

RP Fiber Calculator – a convenient tool for calculations on optical fibers -- offered for free
let us celebrate the 10-year anniversary of RP Photonics!

Read a random article every day in order to steadily learn about photonics!

Laser Design Services

Fast and efficient laser development is possible with the competent design services of RP Photonics, based on extensive experience, deep scientific knowledge and advanced software.

Resonator Design Software

RP Resonator – do you know a more flexible resonator design software?

laser resonator design