Extended-Cavity Semiconductor Wavelength-Swept Laser for Biomedical Imaging

Area of Science:

• Optics and Photonics
• Biomedical Engineering

Background:

• Advanced laser sources are crucial for high-resolution biomedical imaging.
• Existing tunable lasers often face limitations in power, speed, or linewidth.

Purpose of the Study:

• To demonstrate a novel, compact, high-power, rapidly swept wavelength tunable laser source.
• To evaluate its suitability for biomedical imaging applications.

Main Methods:

• Utilized a semiconductor optical amplifier and an extended-cavity grating filter.
• Integrated components to achieve rapid wavelength sweeping capabilities.

Main Results:

• Achieved >4-mW average output power.
• Maintained an instantaneous linewidth of <0.06 nm.
• Demonstrated >80-dB noise extinction over a 100 nm sweep range at 1310 nm.
• Operated at variable repetition rates up to 500 Hz.

Conclusions:

• The developed laser source exhibits excellent output characteristics for biomedical imaging.
• Its compact size, high power, and rapid tuning make it a promising tool for advanced imaging techniques.