60FC-Q405-0-M75-01

Fiber Collimator for collimating large beam diameters with integrated quarter-wave plate

Features

The fiber collimator is designed for collimating radiation exiting from an optical fiber cable. An integrated adjustable quarter-wave plate is used to generate left-handed or right-handed circularly polarized radiation.

Large beam diameters: Focal length 75 mm
Optics type: Doublet optics, Achromatic
AR-Coating: 400 - 700 nm
Retardation optics for 405 nm
Low-order retardation optics with minimal angular dependency
Paraxial coupling axis, FC-PC connection
Integrated TILT adjustment to prevent aberrations from vignetting or clipping
Front connector accepts attachment optics

Description

The fiber collimators series 60FC-Q has an integrated quarter-wave plate and is designed for collimating radiation exiting optical fiber cables with high pointing stability and adjustable right-handed or left-handed circular polarization. They are suitable for single-mode and polarization-maintaining fiber cables leading to collimated beams with a Gaussian intensity profile.
The features of the collimator type 60FC-Q include:

Optics
The achromat with focal length 75 mm is designed for collimating multiple wavelengths. It is AR-coated from 400 - 700 nm. It is corrected for spherical aberrations and designed in such a way that it leads to a diffraction-limited beam with an M² < 1.05. Additionally it is corrected for chromatic aberration so that there are certain wavelengths or wavelength ranges where the focal length does not vary significantly. It is not suitable for UHV applications.

Adjustment of focus, TILT, and state of polarization
The distance between fiber end-face and collimating optics is adjusted by means of an eccentric key. The lens does not rotate when adjusting the focus. The final focus setting is locked by means of two radially arranged clamping screws. Additionally attachment opticsof series 60FC-Q can be mounted to the front of the collimator. Additionally, the collimator has an integrated TILT adjustment for aligning the beam axis to the mechanical axis. This prevents vignetting of the collimated beam as well as diffraction arising from the clipped beam. The integrated low order retardation optics with minimal angular dependency allows the adjustment of the state of polarization in the assembled state between right-handed and left-handed circular polarization. This is done using a cogged tool and can be monitored using the polarization analyzers series SK010PA. Retardation optics are available for typical wavelengths between 389 nm and 1084 nm.

Connector Type
The fiber collimator is equipped with a FC-PC type receptacle. Because of the spring-loaded fiber ferrule the fiber collimator has an additional grub screw to increase pointing stability.

Material
The fiber collimator type 60FC-Q is made from nickel silver/aluminium (standard)

Mounting
The collimator possesses a flange for low-strain mounting e.g. using the clamp collars series CC.