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RGBV Laser beam combiner with AOTF

Switchable RGBV combiner for Microscopy, Biophotonics or Life Sciences

System for combining up to four wavelengths in the range 405–660 nm into a common singlemode fiber and switching between wavelengths via adjacent AOTF and PC-Interface.

Performance Features

  • Apochromatic RGBV laser beam coupler 60SMS-…: high coupling efficiencies in the whole spectral range 400–660 nm
  • Dichroic long pass filters with a broad spectral transmission
  • Fused silica substrates with 0.3° wedge angle (suppression of interferences)
  • Fiber coupler and fiber cables with inclined coupling axes to avoid back-reflection
  • Three dichroics for superposition
  • AOTF with PC Interface for switching between wavelengths

Many fields e.g. in biophotonics or microscopy call for switchable laser sources in a wide spectral range, with which it is possible to switch between several wavelengths with high frequency (up to several hundred MHz). This is usually done using an AOTF (acousto-optical tunable filter).

Schäfter+Kirchhoff now offers RGBV laser beam combiners with an adjacent AOTF to achieve that goal. The modulated light exiting the AOTF is coupled into a polarization-maintaining fiber and can then be coupled into the experiment with high efficiency and defined polarization.

AOTFs are acousto-optical filters that allow the selection and modulation of one or several wavelengths simultaneously via PC interface. Thus e.g. a defined pulse sequence consisting of different wavelengths can be acquired. The switching frequency depends on the beam diameter inside the AOTF and on the AOTF itself. The modulated light then needs to be coupled into e.g. a microscope. This cannot be done in free beam setups without overcoming problems concerning mechanical stability and time-consuming alignment procedures.

The solution is the fiber coupling of the laser beam sources in polarization-maintaining fibers and a defined beam combining in direct combination with an AOTF, avoiding additional losses. The laser beam combiner combines Red, Blue, Green and ultra-Violet laser light emitted by a number of laser sources with dichroic optics. The apochromatic optics used in the laser beam couplers (at the input/output ports of the laser beam combiner allow for high coupling efficiencies in the whole spectral range between 400–660 nm.

The RGBV fiber optic system has a number of advantages. It serves as a defined interface between laser source and experiment, while being able to separate and decouple the laser beam sources and the measurement setups mechanically and thermally, thus avoiding any mutual negative impacts. The light guidance itself is insensitive to vibrations and long-time stable. Often already existing measurement setups can be upgraded to fiber optics in order to improve stability, handling and work safety.

Schäfter + Kirchhoff GmbH - specialists for optical sensors and measurement technology
Kieler Str. 212, D-22525 Hamburg, Tel. +49(0)40 85 39 97-0, Fax +49(0)40 85 39 97-79