Monolithic high-average-power linearly polarized nanosecond pulsed fiber laser with near-diffraction-limited beam quality

An all-fiberized high-average-power narrow linewidth ns pulsed laser with linear polarization is demonstrated. The laser system utilizes a typical master oscillator power amplifier (MOPA) configuration. The stimulated Brillouin scattering (SBS) is effectively suppressed due to the short fiber length and large mode area in the main amplifier, combined with the narrow pulse duration smaller than the phonon lifetime of SBS effect. A maximal output power of 466 W is obtained with a narrow linewidth of ${\sim}$203.6 MHz, and the corresponding slope efficiency is ${\sim}$80.3%. The pulse duration is condensed to be ${\sim}$4 ns after the amplification, corresponding to the peak power of 8.8 kW and the pulse energy of $46.6~\unicode[STIX]{x03BC}\text{J}$. Near-diffraction-limited beam quality with an $M^{2}$ factor of 1.32 is obtained at the output power of 442 W and the mode instability (MI) is observed at the maximal output power. To the best of our knowledge, this is the highest average output power of the all-fiberized narrow linewidth ns pulsed fiber laser with linear polarization and high beam quality, which is a promising source for the nonlinear frequency conversion, laser lidar, and so on.

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High-peak-power, high-energy, high-average-power pulsed fiber laser system with versatile pulse duration and shape

Optics Letters ◽

10.1364/ol.38.004686 ◽

2013 ◽

Vol 38 (22) ◽

pp. 4686 ◽

Cited By ~ 30

Author(s):

A. Malinowski ◽

P. Gorman ◽

C. A. Codemard ◽

F. Ghiringhelli ◽

A. J. Boyland ◽

...

Keyword(s):

Fiber Laser ◽

Pulse Duration ◽

Peak Power ◽

Laser System ◽

Average Power ◽

High Energy ◽

High Peak ◽

High Peak Power ◽

High Average Power ◽

Pulsed Fiber Laser

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kW-level, narrow-linewidth linearly polarized fiber laser with excellent beam quality through compact one-stage amplification scheme

High Power Laser Science and Engineering ◽

10.1017/hpl.2017.31 ◽

2017 ◽

Vol 5 ◽

Cited By ~ 8

Author(s):

Man Jiang ◽

Pengfei Ma ◽

Long Huang ◽

Jiangming Xu ◽

Pu Zhou ◽

...

Keyword(s):

Fiber Laser ◽

Output Power ◽

Beam Quality ◽

Scale Up ◽

Single Mode ◽

Narrow Linewidth ◽

Seed Laser ◽

One Stage ◽

Linearly Polarized

In this manuscript, we demonstrate high-power, narrow-linewidth linearly polarized fiber laser with excellent beam quality through compact one-stage amplification scheme. By employing a single-mode–multimode–single-mode structure seed laser, a linearly polarized Yb-doped fiber laser with narrow linewidth and high output power is achieved. This laser, when used as a master oscillator, can be capable of suppressing the ASE in the process of power amplification. Thus, only one-stage amplification structure is used to scale up the laser power, and linearly polarized output with a polarization extinction ration of 14 dB, a narrow linewidth of 0.3 nm and an output power of 1018 W are achieved. Moreover, due to the good beam quality of seed laser and the well-designed amplifier stage, the beam quality of the output laser is near-diffraction-limited with $M_{x}^{2}\sim 1.18$ and $M_{y}^{2}\sim 1.24$ at the maximum power, and without mode instability occurring.

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An Eye-Safe, SBS-Free Coherent Fiber Laser LIDAR Transmitter with Millijoule Energy and High Average Power

Photonics ◽

10.3390/photonics8010015 ◽

2021 ◽

Vol 8 (1) ◽

pp. 15

Author(s):

Mehmetcan Akbulut ◽

Leonid Kotov ◽

Kort Wiersma ◽

Jie Zong ◽

Maohe Li ◽

...

Keyword(s):

Fiber Laser ◽

Repetition Rate ◽

Peak Power ◽

Figure Of Merit ◽

Current System ◽

Glass Fibers ◽

Average Power ◽

High Gain ◽

Short Length ◽

High Average Power

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.

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