Isolator with a broad tuning range

FI-x/y-5SV und FI-x/y-5SI/-8SI


The operation of the adjustable isolators FI-390/420-5SV, FI-420/460-5SV, FI-500/780-5SV, FI-500/820-5SV and FI-500/1100-5S/-8SI is based on a single stage Faraday isolator. Precision mechanics allows a continuous adjustment of the interaction between the magnetic field and the TGG crystal without moving any optical components. An adjustment of the Faraday rotation to exactly 45° in the range from 500 to 780nm (to 820nm as an option) and up to 1100nm, with the FI-500/1100-5SI/-8SI, is thus possible.

It is also possible to set the rotation angle to any value between 0° to 45° in this wavelength range in order to study the effects of varying degrees of feedback. Easy access is provided to the blocked beam by polari­zing beam splitter cubes, which divert the blocked beam by 90°.

Removing the polarizers of the FI-x/y-5SI/-8SI turns this unit into a highly sensitive, adjustable Faraday rota-tor. Precision mechanics permit the exact reproduction of adjustments previously established and with the addition of an optional micrometer display, an angular resolution in the arc minute range is achievable.

The incorporation of very powerful magnets insures a compact and efficient design.

Operation

The isolator can be mounted on rods, cylindrical mounts or by using the assembly surfaces so that the laser polari­zation can be oriented horizontal or vertical.

The FI-x/y-5SV is delivered with an angle bracket for additional mounting possibilities.

The lateral exit window and the entry and exit polarizers are easily cleaned when the security rings are removed.

Applications

These isolators are suitable for all lasers operating in the 500–1100nm wavelength range especially for:

Ar+ and Kr+ lasers 

other Ion lasers
HeNe lasers 

other gas lasers
Diode lasers 

Nd:YAG lasers
Ti: Sapphire lasers 

Cr:LiCAF lasers
Dye lasers 

Alexandrite lasers
Mode-locked lasers 

Short Pulse lasers 

Faraday Rotator:

For every laser line selected from 390nm to a maximum of 1100nm, every polarization direction from 0° to 90° is precise and reproducible.