An optical bandpass filter is a spectrally selectively transparent component capable of transmitting select wavelengths of light while blocking others. They are fully customisable to varying center wavelengths and bandwidths, enabling their application in a broad range of practical applications including fluorescence spectroscopy, microscopy, and flow cytometry. Delta Optical Thin Film previously explored the range […]

Fluorescence spectroscopy is the processes of analyzing the emissive, spectral characteristics of a fluorescent compound which has been excited by photons of light. Typically, a sample will fluoresce light with longer wavelengths thus lower energy than that which it absorbed, requiring sensitive equipment with a broad wavelength range and high optical blocking (OD) to accurately […]

Fluorescence microscopy is a technique used to analyze biological structures in a sample using a white lamp, and either organic or inorganic fluorophores such as dyes to excite a photo-emissive reaction, which is observed using an optical bandpass filter and a dichroic mirror. Various biochemical industries rely on fluorescence microscopy for the performance of molecular […]

Laser raster microscopy, or confocal laser scanning microscopy (CLSM), is an optical analysis technique for fluorescence microscopy. It is a broadly applied image analysis method with applications in biological and medical research, and utilizes a combination of a diffraction-limited laser, beam splitters, and bandpass filters, to observe the excitation of photo-fluorescence particles, or fluorescent dyes […]

Fluorescence microscopy is an imaging technique that is often employed in medical research and biological applications. The technique uses fluorescence and phosphorescence in addition to, or instead of absorption or reflection to study the properties of a substance. Fluorescence microscopy is a popular technique as fluorescence has extremely high sensitivity and specificity, which helps to […]

Fluorescence is the phenomenon where a molecule absorbs light within its absorption band and then emits this light at longer wavelengths within its emission band. This phenomenon can be used to identify, quantify, and observe chemical activity, and it is a popular method due to its high levels of sensitivity, simplicity, and specificity. Fluorescence spectroscopy […]

Over the past six years, Delta Optical Thin Film A/S have been producing and further developing spatially variable filters. These types of filters have spectral characteristics that change spatially and were around for several years before we started to develop our own. Traditionally, when people use the term linear variable filter they mean a filter […]

A new Laser Attenuator has been developed, which utilizes an ultra-hard coated, Laser Optical Multilayer Attenuator (LOMA) filter from Delta Optical Thin Film. The laser attenuator enables computer-controlled attenuation of a monochromatic light source from 1% – 99% within the wavelength region of ~ 550 nm – 1000 nm. It provides the user with safe, […]

Charged-couple device (CCD) and complementary metal oxide semiconductor (CMOS) sensors are the most common types of image sensors. They work by converting incident radiation into electrical signals that produce the image. In order for these sensors to work successfully, they require a bandpass filter, which is the element that determines which wavelengths are allowed to […]

A beamsplitter is an optical element that is used to split incident light into two or more beams by wavelength, polarization or intensity. Standard models are often used with unpolarized light sources in applications where the state of polarization isn’t important. These beamsplitters are designed to split unpolarized light at a specific reflection/transmission ratio. Other […]