Resource Library

Group Delay Dispersion – What it is and why ultrafast laser applications care about it?

The term Group Delay in optics is the relative amount of time light of different frequencies is delayed as it travels through a transmitting medium (like an optic made of glass) or it rattles around inside the many layers of a thin-film coating. At some frequencies (or wavelengths), it takes light longer to emerge from the medium or thin-film coating than at other frequencies. Learn More

How to achieve high blocking by combining filters

It is possible to increase blocking by combining two or more filters together. However, with modern high-performance filters that block light by reflection, one should not try to increase blocking merely by stacking two filters immediately next to one another—combining filters this way only works when multiple reflections between the filters are reduced or eliminated! Learn More

Build Your Own Fluorescence Filter Set

Despite the availability of “standard filter sets” (a combination of optimally designed exciter, dichroic and emitter filters) offered by optical filter manufacturers, it is not uncommon for researchers to build their own “custom filter sets” comprised of unique combinations of otherwise standard individual filters. Explore common pitfalls and key considerations when building custom optical filter sets. Learn More

Polymer Information

Polymer fittings and ferrules have proven to be superior to stainless steel in many analytical applications. IDEX Health & Science has compiled the following solvent compatibility information for polymers commonly used in HPLC. Learn More

IP (Ingress Protection) Rating

A two-digit number (as specified in EN 60529) is used to provide an IP rating to a piece of electronic equipment or to an enclosure for electronic equipment. The two digits represent two different forms of environmental influence. In this article, we explain the value of each digit.

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HPLC Help Center

High Performance Liquid Chromatography (HPLC) is an analytical process designed to separate, quantify and analyze components of a chemical mixture. Ultra-High Performance Liquid Chromatography (UHPLC) is HPLC operated at extremely high pressure (>12,000 psi / 800 bar). Learn More

Ion-Beam-Sputtered (IBS) Thin-film Interference Filters for Nonlinear Optical Imaging

In this paper we discuss various important characteristics of hard-coated thin-film interference filters, such as high light throughput, steep edges, and high out-of-band blocking, all of which require careful consideration when designing and manufacturing optical filters for NLO imaging applications. Learn More