Tunable, High Power Fiber Optic Laser for Lidar Applications

We propose to develop a fiber laser which can be tuned over the range of 1530-1575 nm,produce high pulse energy at pulse rates from CW up to 10 KHz, has a narrow line width, and can simultaneously lase on two tunable wavelengths. Additionally, this laser will operate within the ?eye safe? range. A laser of this type would be attractive for conventional lidar and altimeter systems as well as wind lidar and DIAL systems. With the addition of a fiber amplifier this laser would eventually be capable of generating pulses on the order of tens of milli-joules, an amount suitable for space-based lidar systems. The laser output could be doubled into the near-IR range, tripled into the visible range, and quadrupled into the UV range of 382 to 394 nm.We propose to combine the dual wavelength fiber laser developed by Jin U. Kang of Johns Hopkins University with multi-mode methods developed by Fabio Di Teodoro of the Naval Re-search Lab. If successful, these lasers would provide a breakthrough for ground based, airborne and space based lidars due to their combination of eye safe wavelengths, high power, tunability, and capability for dual wavelength operation. Their inherent solid state structure and lack of external components make them ideal for space applications.