High spatial resolution hyperspectral camera based on exponentially variable filter

Our customer Ingmar G. E. Renhorn recently published an article in Optical Engineering, 58 (10), 103106 (2019), https://doi.org/10.1117/1.OE.58.10.103106 that utilizes our most recent development, a continuously variable bandpass filter that features an exponential dispersion to obtain uniform sampling with respect to spectral resolution, i.e., a constant number of samples per spectral channel. At Delta Optical Thin Film we are  proud to contribute with our unique Bifrost Continuously Variable Filters to this innovative camera!


Delta Optical Thin Film A/S was awarded the prestigious Børsen Gazelle 2019 award

Delta Optical Thin Film A/S was awarded the prestigious Børsen Gazelle 2019 award today. The Gazelle is awarded to companies that grew their revenue in four consecutive years and have at least doubled their revenue in these four years. Obviously we achieved these criteria 😉 We owe a big “Thank you!” to our customers, partners, suppliers and last not least our colleagues who made this achievement possible!

Our company owners CEO Poul Svensgaard and CTO Henrik Fabricius presenting the letter that informs about the Børsen Gazelle 2019 award.

Delta Optical Thin Film A/S Develops Range of Optical Filters for Leica Microsystems

Leica Microsystems develop and manufacture a range of microscopes and scientific instruments for microstructure and nanostructure analysis. Delta Optical Thin Film has developed a range of optical filters for Leica Microsystems, for use in their SP8 DIVE Deep In Vivo Explorer.

SP8 DIVE Deep In Vivo Explorer

The SP8 DIVE Deep In Vivo Explorer is the first spectrally tunable solution for multicolour, multiphoton imaging. The instrument is equipped with 4Tune, which is a tunable, non-descanned detection system. This provides the users with flexibility and the opportunity to develop innovative multicolour deep in vivo experiments.

The 4Tune detector can be equipped with 2–4 detection units and it can be configured with hybrid detectors and photomultipliers. It uses a combination of continuously variable dichroic beam splitters and continuously variable edge filters to separate the emission light. These optical filters have now been developed by Delta Optical Thin Film to help further improve the capabilities of the SP8 DIVE Deep In Vivo Explorer.

Source: Leica Microsystems

Optical Filters from Delta Optical Thin Film

Delta Optical Thin Film has utilized over 50 years of experience to develop a range of optical filters for Leica Microsystems to use in the SP8 DIVE. The range created for Leica Microsystems includes Continuously Variable Short Wave Pass, Continuously Variable Long Wave Pass Filters, and a Continuously Variable Dichroic Beamsplitter.

A continuously variable filter is a wedged filter that has spectral properties that vary continuously along one dimension of the filter. Just one of these filters can be used as an alternative to several fixed filters in an instrument, and the center or edge wavelength can be adjusted by sliding the optical filter.

All continuously variable filters from Delta Optical Thin Film are coated with ultra-hard surface coatings, which are produced with an advanced plasma process that builds layer with a much higher packing density than traditional hard coatings.

The combination of continuously variable long wave pass filters (CVLWP) and continuously variable short wave pass filters (CVSWP) enables the construction of bandpass filters, which can be tuned continuously between 380 nm and 800 nm. These filters also have the advantage of tunable bandwidth.

These optical filters set new standards in edge steepness and transmission level, and also provide improved blocking. Coated on a single fused silica substrate, these optical filters exhibit minimal auto-fluorescence and a high threshold to laser damage.

Delta Optical Thin Film is one of the very few companies that produce low-bending dichroic beamsplitters, like the one utilized by Leica Microsystems. The continuously variable dichroic beamsplitters have a wide transmission band, wide reflection band, and high edge steepness.

Compact snapshot optically replicating and remapping imaging spectrometer (ORRIS) using a focal plane continuous variable filter

Our customer Tingkui Mu from from Xi'an Jiaotong University developed a novel snapshot spectral imaging technique, optically replicating and remapping imaging spectrometer. Read the article he published in Optics Letters Vol. 44, Issue 5, pp. 1281-1284 (2019), https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-5-1281

Ultra-compact multispectral camera based on micro-optics

Our customer Fraunhofer IOF published an article about their Ultra-compact multispectral camera based on micro-optics in laser + photonics January 2019. Download a PDF copy here