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Ultrabroadband optical chirp linearization for precision metrology applications.
Peter A Roos1, Randy R Reibel, Trenton Berg
1Bridger Photonics, Inc., 2310 University Way, Building 4-4, Bozeman, Montana 59715, USA. roos@bridgerphotonics.com
Optics Letters
|December 3, 2009
Summary
We precisely linearize ultrabroadband laser frequency chirps using a fiber-based technique. This breakthrough enables ultra-high-resolution frequency-modulated continuous-wave laser-radar (LADAR) and advanced metrology applications.
Area of Science:
- Optics and Photonics
- Metrology
- Laser Technology
Background:
- Precise control of laser frequency chirps is crucial for advanced measurement techniques.
- Existing methods often lack the resolution and bandwidth required for demanding applications like laser-radar (LADAR).
Purpose of the Study:
- To demonstrate a novel method for precise linearization of ultrabroadband laser frequency chirps.
- To enable high-resolution LADAR and other metrology applications through improved chirp control.
Main Methods:
- Utilized a fiber-based self-heterodyne technique for chirp linearization.
- Achieved ultrabroadband frequency chirps with bandwidths up to 5 THz.
Main Results:
- Demonstrated frequency errors as low as 170 kHz relative to linearity.
- Enabled 31-micrometer transform-limited LADAR range resolution (FWHM).
- Achieved 86 nm range precisions over a 1.5 m range baseline.
Conclusions:
- The developed technique provides precise linearization of ultrabroadband laser frequency chirps.
- This advancement significantly enhances the capabilities of LADAR and other precision measurement systems.
- Future applications may be limited by environmental factors like atmospheric turbulence and fiber dispersion.
