Delta Optical Thin Film A/S

Halle 3.1 – Stand 800




Produktübersicht

Optische Komponenten und Materialien
  • Optische Komponenten
  • Spiegel, Strahlteiler
  • Filter, dielektrische Interferenzfilter
  • Strahlteiler, dielektrisch

Produktneuheiten

Continuously Variable Bandpass Filters for Hyperspectral Imaging

Hyperspectral imaging (HSI) has been used for a couple of decades in applications such as satellite imaging, air reconnaissance and other not overly price sensitive markets. Classical HSI cameras use prisms or grating as dispersive elements. These cameras are bulky, sensitive to misalignment and very expensive. The advent of alternative approaches makes HSI attractive for volume markets or even consumer products, for example cancer detection, precision farming, food testing in supermarkets and many more.
We develop and manufacture custom Continuously Variable Bandpass Filters (CVBPF) for mid-size and full-frame CCD/CMOS. These filters offer very high transmission and are fully blocked in the light sensitive wavelength range of silicon-based detectors (200nm to 1150nm). The combination of CVBPFs with silicon detectors allows the design of very compact, robust and affordable HSI detectors that offer several advantages and benefits over conventional approaches:
• Huge aperture compared to grating and prism
• Higher transmission than grating and prism
• Short measurement time
• High suppression of stray light
• Excellent signal to noise ratio
We welcome requests for custom designed CVBPF. Available for immediate application are filters with the following specifications:
• Centre wavelength range (CWL) 450nm to 880nm, bandwidth approximately 2% of centre wavelength, transmission 60% to 90%, blocking range 200nm to 1150nm, blocking OD4, for sensor size 24mmx36mm
• CWL 450nm to 850nm, bandwidth approximately 4% of centre wavelength, transmission 70% to 90%, blocking range 200nm to 1100nm, blocking OD4, for sensor size 25mmx25mm
• CWL 450nm to 950nm, bandwidth approximately 2% of centre wavelength, transmission 20% to 90%, blocking range 200nm to 1200nm, blocking level OD4, for sensor size 24mmx36mm
• CWL 796nm to 1084nm, bandwidth approximately 1% of centre wavelength, transmission >85%, blocking range 200nm to 1150nm, blocking OD4, for sensor size 32mmx18mm

Continuously Variable Bandpass Filters for Hyperspectral Imaging
Hyperspectral imaging detector with Continuously Variable Bandpass Filter


Produktgruppe:

Optische Sensoren


Ansprechpartner

Herr Oliver Pust

+49 26848519661


Delta Optical Thin Film A/S launches 4G Continuously Variable Filters

Delta Optical Thin Film has utilised its decades of experience to develop the 4th generation Continuously Variable Short Wave Pass and Continuously Variable Long Wave Pass Filters.

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 centre 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 layers with a much higher packing density than traditional hard coatings. 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 Continuously Variable Filters exhibit minimal auto-fluorescence and a high threshold to laser damage.

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 410 nm and 895 nm. These filters also have the advantage of tunable bandwidth. The total wavelength range is split into two sets of CVFs: two CVLWP and two corresponding CVSWP. The physical length is longer than for the 3G CVF. This yields a higher spectral resolution with the same light spot. The blocking level (OD value) has increased, and the blocking range of the CVLWPs has been extended to 1025 nm. This removes the needs for additional blocking filters.

The four new filters are:

4G CVLWP 410 nm – 652 nm, 82.4x13x0.9 mm³, LF104160
4G CVSWP 425 nm – 652 nm, 82.4x13x0.9 mm³, LF104161
4G CVLWP 652 nm – 895 nm, 82.4x13x0.9 mm³, LF104162
4G CVSWP 652 nm – 895 nm, 82.4x13x0.9 mm³, LF104163

Delta Optical Thin Film A/S launches 4G Continuously Variable Filters
4G Continuously Variable Filters


Produktgruppe:

Optische Komponenten und Materialien


Ansprechpartner

Herr Oliver Pust

+49 26848519661


Circular Variable Bandpass Filters

In addition to their well-known line of Continuously Variable Filters Delta Optical Thin Film A/S now also offers Circular Variable Bandpass Filters. These are interference narrow bandpass filters of advanced design, which are deposited on circular substrates, called segments. Film thickness, and therefore the wavelength of peak transmittance varies linearly and continuously with angular position on the segment. The filters are ideally suited as monochromators in compact, non-dispersive spectrometers or with supercontinuum lasers, providing medium spectral resolution, or when information is desired at several specific wavelengths in the relevant spectral range.

A Circular Variable Bandpass Filter can be manufactured in any wavelength range from 400 nm in the visible up to 14.3 µm in the infrared. The specific wavelength at which the radiation is transmitted by the segment is selected by appropriately positioning it on the optical beam. Segment rotation, in a way that the beam traces a circumferential path on it, provides a continuous scan of its complete wavelength range. A spectral resolution element size on the CVF varies between one and two millimetres. Each of the in total seven segments spans 90°. Four segments can be mounted on a pre-balanced wheel, that can be rotated by a USB connected controller.

Circular Variable Bandpass Filters
Circular Variable Bandpass Filter

Produktgruppe:

Optische Komponenten und Materialien


Ansprechpartner

Herr Oliver Pust

+49 26848519661


Kleine optische Filter ohne Kompromisse beim spektralen Leistungsvermögen

Delta Optical Thin Film can deliver physically small custom optical filters for research, clinical and Point-of-Care (PoC) fluorescence-based instruments in high volumes at low cost. By combining our optical filters with our knowledge in complete optical design, we help our customers with more than the optical filters.

PoC medical technologies require portable, small and robust instrumentation for practical implementation. Most of the potential applications of PoC technology require a detection sensitivity at least equivalent to existing methods. This means that the optics in this system need to be at least as good as in larger equipment. The challenge is to reduce the size of all optics without compromising the optical output.

We have often been involved in optimisations of the optical system, and thereby improved the quality of the instrument together with our customers. Our background as OEM supplier of high-quality filter sets for fluorescence microscopy gives the right background as supplier of optical filters used in PoC instruments. Many times, our high-performance fluorescence filters have been the starting point of fruitful collaborations.

PoC diagnostics suppliers need micro-fluidics technology, medical expertise, and optical expertise, meaning that close and efficient partnerships between very different companies are required. Delta Optical Thin Film is used to work as a trusted partner, and we have many times been involved in optimisations of the optical system, thereby improved the quality of the instrument together with our customers.

Our optical filters have been used in clinical applications in the biomedical, biotech, and drug discovery markets. All our optical filters are engineered for the next generation of PoC instruments.

Kleine optische Filter ohne Kompromisse beim spektralen Leistungsvermögen
Physically small custom optical filters

Produktgruppe:

Optische Komponenten und Materialien


Ansprechpartner

Herr Oliver Pust

+49 26848519661


Zusatzinformationen


YouTube


Fachvorträge

Mittwoch 18. November 2020, 11:00 bis 11:40 Uhr Aussteller-Forum / Halle 3.1, Stand 533 Forum

How Benefit from Continuously Variable Filters in Fluorescence Microscopy, Spectroscopy?

 

Referent/in:
Dr.-Ing. Oliver Pust
Delta Optical Thin Film A/S, Hørsholm

 

Produktgruppe:

Optische Komponenten und Materialien