Abstract
Two all fiber-based laser systems are demonstrated to achieve high energy and high average power femtosecond pulsed outputs at wavelength of 1 µm. In the high energy laser system, a pulse energy of 1.05 mJ (0.85 mJ after pulse compressor) at 100 kHz repetition rate has been realized by a Yb-doped ultra large-core single-mode photonic crystal fiber (PCF) rod amplifier, seeded with a 50 µJ fiber laser. The pulse duration is 705 fs. In the high average power experiment, a large mode area (LMA) fiber has been used in the final stage amplifier, seeded with a 50 W mode locked fiber laser. The system is running at a repetition rate of 69 MHz producing 1052 W of average power before compressor. After pulse compression, a pulse duration of 800 fs was measured.
Highlights
An ideal high energy and/or high power ultrafast fiber laser should include all fiber based seed oscillator, stretcher, and amplifiers
In the high energy laser system, a pulse energy of 1.05 mJ (0.85 mJ after pulse compressor) at 100 kHz repetition rate has been realized by a Yb-doped ultra large-core single-mode photonic crystal fiber (PCF) rod amplifier, seeded with a 50 μJ fiber laser
In the high average power experiment, a large mode area (LMA) fiber has been used in the final stage amplifier, seeded with a 50 W mode locked fiber laser
Summary
An ideal high energy and/or high power ultrafast fiber laser should include all fiber based seed oscillator, stretcher, and amplifiers. In the high energy experiment, an Yb-doped, ultra large-core, single-mode PCF rod, seeded with a 50 μJ chirped pulse fiber laser, has been used to boost the pulse energy to 1.05 mJ at 100 kHz repetition rate. In the high average power experiment, a final stage large mode area (LMA) fiber amplifier, seeded with a 50 W chirped pulse fiber laser at a pulse repetition rate of 69 MHz, a has been used to produce 1.05 kW of average power before compressor. A pulse duration of 800 fs was measured Both 1.05 kW average power and 1.05 mJ pulse energy are the highest record from all fiber-based femtosecond laser systems to the best of our knowledge. This progress is one step closer towards achieving both mJ pulse energy and kW average power in single all fiber based femtosecond fiber laser system
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