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MICRO-CONTROLE / Spectra-Physics
Wavelength Tunable Faraday Isolators

Wavelength Tunable Faraday Isolators

Product catalog summary

Overview: The document provides technical specifications and features of Newport's 500-1030nm Wavelength Tunable Faraday Isolators, designed to eliminate frequency instability in single frequency laser diodes and parasitic oscillations in amplified laser systems.

Specifications: The isolators rotate polarized light by 45° in the forward direction and an additional 45° in the reverse direction, maintaining linear polarization. They offer high transmission in the forward direction and attenuate reverse light to protect laser diodes from back reflections. Available with dichroic glass or polarizing beam splitter cube polarizers, they are RoHS compliant and can be tuned for maximum isolation.

Benefits: These isolators eliminate frequency instability and parasitic oscillations, providing optimal isolation across a range of wavelengths. They can be ordered with optional λ/2 plates and used in series for enhanced isolation.

Low Power Isolators: These are available for center wavelengths of 650nm, 780nm, 850nm, and 980nm, with isolation >30dB and transmission >72.5% to >90%, depending on the wavelength. They use dichroic glass polarizers with a damage threshold of 25W/cm² CW.

Medium Power Isolators: Available for center wavelengths of 532nm, 650nm, 780nm, 850nm, and 980nm, these isolators offer isolation >27dB and transmission >88%. They use PBS cube polarizers with a damage threshold of 1J/cm² at 10ns.

Dimensions: The document provides dimensions for both low and medium power isolators, with all measurements in inches.

Catalog excerpts

Newport's 500-1030nm Faraday Isolators rotate the plane of polarized light 45° in the forward direction and an additional 45° of non-reciprocal rotation in the reverse direction while maintaining the light's linear polarization. The Faraday Isolator provides high transmission in the forward direction and strongly attenuates any light traveling in the reverse direction, effectively protecting laser diodes from the deleterious effects of back reflections. Newport's 500-1030nm Faraday Isolators can be ordered with dichroic glass polarizers to minimize the size of the device for low power applications or they can be ordered with polarizing beam splitter cube polarizers for applications where maximum transmission is required and power levels do not permit the use of dichroic glass polarizers. By aligning the output polarizer orthogonal to the backward traveling light, isolation can be maximized within the usable wavelength range of the Faraday Isolator. Benefits: • Eliminate frequency instability in single frequency laser diodes • Eliminate parasitic oscillations due to ASE in amplified laser systems • Wavelength tunability allows optimal isolation at a variety of wavelengths • Isolators centered at 650nm, 780nm, 850nm, and 980nm can be ordered with either dichroic glass polarizers or polarizing beam splitter cube polarizers • Optional A/2 plate available for all isolatorsa • Two isolators can be used in series to attain 60dB isolation which is often required Specifications : for single frequency laser diodes Medium Power Isolatorsc a The addition of a waveplate may restrict wavelength range. b Product specifications are subject to change. c RoHS compliant. d When placed between crossed polarizers having an extinction ratio of >1000:1. e At center wavelength. f When tuned for maximum isolation. g Isolators with PBS cube polarizers have CW damage threshold of 2KW/cm2.

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