• Minimize Feedback into Optical System
• Free-Space Input and Output
• Fixed Wavelength
• Polarization Dependent
• Smallest and Least Expensive
• No Tuning

Thorlabs IO-5BB-800-HPFree-Space Isolator is a fixed narrowband isolator with optics that are factory aligned and fixed into place so that the peak isolation and transmission will occur at 800 nm, the pre-defined center wavelength. Any deviation from this wavelength will cause a dip in isolation and transmission. It exhibits high transmission and isolation over a wide wavelength range making it ideal for use in systems with multiple wavelengths of light. This isolator has a High Power (HP) Glan-type crystal polarizer which is larger than other polarizers but offers very high transmission. This polarizer can handle high powers.

Optical isolators are magneto-optic devices that only transmit light in one direction. They are able to isolate a source, such as a laser, from back reflections. Back reflections typically create instabilities in a system, which can lead to a number of issues. Mode hop, amplitude modulation, and frequency shifts are all possible side effects of these instabilities. Additionally, power spikes created by back reflections can permanently damage equipment such as lasers and optics.

Thorlabs offers a wide selection of in-stock free-space optical isolators. These isolators typically have higher transmittance and isolation than all other isolators on the market. Furthermore, because of certain proprietary features (covered by 25 years of experience and 5 US patents), our isolators are smaller and have higher performance than any other units of equivalent aperture available.

• Type: Fixed Broadband
• Center Wavelength: 800
• Operating Range: 748 – 851 nm
• Transmission: 88%
• Isolation: 30 dB
• Max Beam Diameter: 4.5 mm
• Max Power: 35 W
• Max Power Density: 500 W/cm²