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24 October 2025
Webinar Recording Now Available: A Practical Guide to Selecting the Right Fiber Optic Probe

We extend our sincere thanks to all who attended our recent webinar, "Selecting the Right Fiber Optic Probe for your Application." The event was met with a great response, and the insightful questions from our live attendees underscored that choosing the best tool for spectroscopic analysis remains a key challenge for many scientists and engineers. […]

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17 October 2025
Application note: Precise In-Line Analysis of Alcohol Mixtures with Fiber Optic Probes

What is the real cost of an off-spec batch? In many chemical processes, the precise ratio of components like methanol and ethanol can be the difference between profit and loss. Relying on slow, manual lab sampling means you are often reacting to problems long after they occur, rather than preventing them. This is where direct, […]

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2 November 2025
Herbstkolloquium Prozessanalytik 2025 | 3-5 December 2025 | Frankfurt am Main, Germany

art photonics GmbH is pleased to announce its participation in the upcoming Herbstkolloquium Herbstkolloquium Prozessanalytik 2025 | 3-5 December 2025 | Frankfurt am Main, Germany art photonics GmbH will be participating in the Herbstkolloquium Prozessanalytik 2025, taking place from 3-5 December at the DECHEMA-Haus in Frankfurt am Main. We welcome you to visit us at […]

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17 September 2025
Free Webinar: A Practical Guide to Selecting the Right Fiber Optic Probe

In the world of spectroscopy, the fiber optic probe is the critical link between the analyzer and the sample. The success of an entire analysis—impacting data quality, accuracy, and reproducibility—often hinges on selecting the appropriate probe for the specific application. With a vast array of sample types, environments, and analytical goals, making the right choice […]

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About Our Company
art photonics GmbH, founded in Berlin in September 1998, is one of the worldwide leaders in development and production of specialty fiber products for a broad spectrum from 300 nm to 16 µm. Unique technologies of Polycrystalline Mid InfraRed (PIR-) fibers and Metal coated Silica fibers are used for assembly of various spectroscopy probes for medical diagnostics and industrial process control, in volume production of fiber for medical and industrial lasers, for different fiber bundles, etc. Since January 2024 art photonics GmbH is a member of NYNOMIC GROUP.
Member Of:
UV 200-400 nm
Visible
Near IR 750-2500 nm
Mid IR 2.5 - 18 µm

Collimating & Refocusing Objectives for mid Infra-Red Fiber Cables

Categories: , Tag:

Main features:

  • Compatible with SMA- or FC-terminated fiber cables
  • Pupil diameter 15mm or 5 mm
  • Thread build-in in your optical system
  • Non-Magnetic Aluminium Housing
  • Refocusing or Collimating design
  • M24 thread adaptors to SM1, RMS and S-Mount are available on request

Description

MID-IR Focusing and Collimating Objectives are designed to use with Infra-Red fiber optic cables and bundles.
The housing of the lens easily connects to fiber optic cables either with FC/PC or with SMA connectors and enables Z-axis alignment.

Thread adaptors are suitable to mount lens objectives  to Thorlabs optical components with SM1, RMS and S-Mount.

Mid-IR Lenses are available with anti-reflection (AR) coating for two spectral ranges:

  • 3-5µm – for Chalcogenide IR-fiber  (CIR) cables
  • 8-12μm – for Polycrystalline IR- fiber (PIR) cables

Specs

Table of Refocusing Objectives

Code FORO-L-3/5-F10 FORO-L-8/12-F10 FORO-S-3/5-F5 FORO-S-8/12-F5
ZnSe Lens Double-convex Ø 15 Double-convex Ø15 Plano-convex Ø 5 Plano-convex Ø 5
AR Spectral Range 3-5µm 8-12µm 3-5µm 8-12µm
Lens Focal Distance 10 mm 10 mm 5 mm 5 mm
Numerical Aperture 0,35 0,35 0,25 0,25
Outer Diameter 25 mm 25 mm 12 mm 12 mm
Connecting Thread M24x1 M24x1 no no
Length (approx.) 37 mm 37 mm 23 mm 23 mm
Alignment Options Z-axis positioning Z-axis positioning Z-axis positioning Z-axis positioning
SMA Adapter YES YES YES YES
FC/PC Adapter On Request On Request On Request On Request
Housing Aluminium Black anodizing Aluminium Black anodizing Aluminium Magenta anodizing Aluminium Magenta anodizing

Table of Collimating Objectives

Code FOCO-L-3/5-F20 FOCO-L-8/12-F20 FOCO-S-3/5-F5 FOCO-S-8/12-F5
ZnSe Lens Plano-convex Ø 15 Plano-convex Ø15 Plano-convex Ø 5 Plano-convex Ø 5
AR Spectral Range 3-5µm 8-12µm 3-5µm 8-12µm
Lens Focal Distance 20 mm 20 mm 5 mm 5 mm
Numerical Aperture 0,35 0,35 0,4 0,4
Outer Diameter 25 mm 25 mm 14 mm 14 mm
Connecting Thread M24x1 M24x1 no no
Length (approx.) 37 mm 37 mm 23 mm 23 mm
Alignment Options Z-axis positioning Z-axis positioning Z-axis positioning Z-axis positioning
SMA Adapter YES YES YES YES
FC/PC Adapter On Request On Request On Request On Request
Housing Aluminium Black anodizing Aluminium Black anodizing Aluminium Magenta anodizing Aluminium Magenta anodizing

Downloads

Graphs

Transmission Spectra

MID-IR Refocusing Objectives (FORO)

Collimating Objectives for Mid IR-Fiber Cables (FOCO)

Applications

  • Focusing the beam out of the fiber or, used in reverse, into the fiber
  • Collimating the beam out of the fiber or, used in reverse, focusing of collimated beam into the fiber
  • Fiber end/bundle imaging to the detector

Using a lens to collect the radiation into the optical fiber

The area S is limited by the numerical aperture of the optical fiber. The fiber "sees" the radiation exiting from each point within the area S.

The radiation reaching the fiber end is proportional to the angle d1/L, where d1 is the fiber diameter, L is the distance between S and fiber end.

To increase the radiation collected into the fiber, it is necessary to put a lens between S and fiber end, then the signal is proportional to d2/L, where d2 is the lens diameter (d2 > > d1).

Focus distance F and the lens diameter d2 should agree with the numerical aperture of the fiber.

Inquiry

Do you have any questions about this or any other product? Send us an inquiry, and our personnel will answer your question as soon as possible.

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