IO-F-780

• Designed specifically for 780 nm laser systems.
• Provides 35 dB minimum isolation to suppress back reflections.
• High transmission: >90% at the design wavelength.
• Based on Faraday rotation technology for non-reciprocal optical isolation.
• Protects sensitive laser sources from optical feedback.
• Suitable for single-frequency, diode, and external-cavity lasers.
• Free-space optical design for easy integration into laboratory setups.
• Compact housing with integrated polarization optics.
• Optimized for operation at 780 nm.
• Improves laser stability by reducing intensity and frequency fluctuations caused by reflected light.
• Commonly used in atomic physics, spectroscopy, and quantum optics experiments.

The Thorlabs IO-F-780 is a free-space Faraday optical isolator designed to provide effective protection for laser systems operating at 780 nm. Optical isolators are essential components in precision laser setups where unwanted reflections can destabilize a laser source, broaden the linewidth, increase noise, or cause mode hopping.

The isolator operates using the Faraday effect, a non-reciprocal polarization rotation phenomenon. Light traveling in the forward direction passes through the isolator with high transmission, while light reflected back toward the laser experiences an additional polarization rotation and is rejected by the internal polarizer. This prevents reflected light from re-entering the laser cavity.

The IO-F-780 is optimized for the 780 nm wavelength commonly used in Rubidium atomic transitions, laser cooling systems, quantum optics experiments, spectroscopy, and precision metrology applications.

With a minimum isolation of 35 dB and transmission greater than 90%, the isolator effectively suppresses back reflections while maintaining high optical throughput. The compact free-space configuration allows straightforward integration into optical tables and laser beam delivery systems.

Because the isolator is wavelength-specific, maximum performance is achieved near the design wavelength of 780 nm. Operation significantly away from this wavelength may reduce both transmission and isolation performance.

Product Type: Free-Space Optical Isolator
Part Number: IO-F-780
Design Wavelength: 780 nm
Isolation: ≥35 dB
Transmission: >90%
Isolation Principle: Faraday Rotation
Optical Configuration: Free-Space
Input Polarization: Linear Polarization
Polarization Type: Polarization-Dependent
Beam Direction: Unidirectional Transmission
Application Wavelength Region: Near Infrared (NIR)
Mounting Style: Integrated Free-Space Housing
Function: Laser Feedback Suppression

The IO-F-780 is suitable for a wide range of laser and photonics applications, including:

• Rubidium Atom Experiments
• Laser Cooling and Trapping
• Quantum Optics
• Atomic Physics
• Laser Frequency Stabilization
• External Cavity Diode Lasers (ECDL)
• Precision Spectroscopy
• Interferometry
• Optical Metrology
• Laser Beam Delivery Systems
• Cold Atom Research
• Photonics Research
• Scientific Laser Systems
• Nonlinear Optics
• Optical Communication Research

The IO-F-780 is particularly valuable in experiments using 780 nm diode lasers, where even small optical reflections can introduce frequency instability or mode hopping. By providing high isolation and transmission, it helps maintain laser performance and measurement accuracy in demanding research environments.