FlexiSpec®

Spectroscopy Fiber Probes & Probe Couplers

FlexiRay®

Fibers | Cables | Bundles | Accessories

FlexiService

Loan & Installation | Measurements Training | Repair | Development
News
Latest News
24 December 2025
Merry Christmas and a Happy New Year 2026 from art photonics!

If you look closely at our holiday card this year, you might notice a familiar tool in an unfamiliar setting. Yes, that is one of our probes in the wine glass! It is a little nod to who we are: even when we are celebrating, we never stop thinking about the science that brings us […]

Read more
17 December 2025
Application Note: Monitoring Ethanol Evaporation in Mulled Wine using Fiber-Based MIR Spectroscopy

Believe it or not, Christmas 2025 is fast approaching. For many, the holiday season is synonymous with traditional markets and the comfort of a hot cup of mulled wine. However, there is a genuine scientific reason why you should never let your Glühwein boil, and it goes beyond simple culinary advice. In our latest Application […]

Read more
Latest Events
5 December 2025
Meet Us at the 20. Herbstkolloquium Prozessanalytik

The art photonics team is currently fully engaged at the 20. Herbstkolloquium Prozessanalytik, and with two days already behind us, we are thrilled with the productive atmosphere and the depth of the technical exchanges. The event kicked off with strong momentum, setting the stage for deep discussions on the future of process control. We were […]

Read more
25 November 2025
Webinar: Combi Probes - Solving the "Blind Spot" of Single-Mode Spectroscopy

In complex chemical analysis and biomedical diagnostics, relying on a single spectroscopic technique often results in a "blind spot." While Near-Infrared (NIR) offers speed, it frequently lacks specificity. Raman spectroscopy provides a precise molecular fingerprint but often battles fluorescence interference. Mid-IR offers excellent structural detail but is limited by shallow penetration depths. The Challenge: Spatial […]

Read more
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.

We use the Mailchimp service (Intuit Inc., USA) to distribute our newsletter. Your data is used exclusively for the purpose of sending the newsletter and will be processed based on your consent (Art. 6 para. 1 lit. a GDPR). Mailchimp may also process data in the United States. Please note that the USA is considered a third country without an adequate level of data protection. For more information, please refer to Mailchimp’s Privacy Policy: https://mailchimp.com/legal/privacy/ .
crossarrow-right
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram
Copy link
Powered by Social Snap