Abstract
We report on an eye-safe, transform-limited, millijoule energy, and high average power fiber laser. The high gain and short length of the NP phosphate-glass fibers enable the SBS-free operation with kW level peak power. The output energy is up to 1.3 mJ, and the average power is up to 23 W at an 18 kHz repetition rate with 600 ns pulses (peak power > 2.1 kW). The PER is ≈16 dB and the M2 of the beam is 1.33 × 1.18. The coherent LIDAR Figure Of Merit (FOM) is 174 mJ*sqrt(Hz), which to our knowledge is the highest reported for a fiber laser. We also report 0.75 mJ energy and >3.7 kW peak power with down to 200 ns pulses and up to 1.21 mJ energy with a 3–5 kHz repetition rate operation of the current system.
Highlights
A.; Chavez-Pirson, A.; The market for coherent Doppler wind Light Detection and Ranging (LIDAR) sensors is growing rapidly as the air travel and clean wind energy sectors continue to expand.Especially for airports, coherent wind LIDAR can provide vital, high-resolution, and realtime information on 3D wind vectors, turbulence, and wake-vortices to improve safety for landing and take-off
For airports, coherent wind LIDAR can provide vital, high-resolution, and realtime information on 3D wind vectors, turbulence, and wake-vortices to improve safety for landing and take-off. These coherent wind LIDARs at the airports are expected to operate at moderate ranges of ≈15 km, with high wind velocity and spatial resolution
NP Photonics’ high energy, single frequency transform-limited fiber laser and amplifier technologies fit perfectly for the task of creating a coherent LIDAR transmitter. We describe such a single-mode and single-polarization eye-safe coherent fiber laser system at 1550 nm wavelength
Summary
A.; Chavez-Pirson, A.; The market for coherent Doppler wind Light Detection and Ranging (LIDAR) sensors is growing rapidly as the air travel and clean wind energy sectors continue to expand. Present-day coherent transform-limited pulsed laser technologies can be divided into two subcategories: the high energy, low repetition rate diode-pumped solid state (DPSS). DPSS systems can produce tens of millijoules of energy with Hz to kHz repetition rates [1,2] They are usually optimized to operate in a narrow range of pulse widths and repetition rates, offer low efficiency, and have high maintenance costs (servicing and realignment). Combining the high-doping concentration with an tration with an increased Based on these unique technologies, have developed a fiber operates a unique technologies, wewe have developed a fiber laserlaser that that operates with with a transform-limited transform-limited optical linewidth, polarization, andsingle-mode near single-mode the eyeoptical linewidth, singlesingle polarization, and near at the at eye-safe.
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