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Megawatt pulses from an all-fiber and self-starting femtosecond oscillator

Henry Haig, Pavel Sidorenko, Robert Thorne, and Frank Wise

Open Access Open Access

Abstract

Mamyshev oscillators produce high-performance pulses, but technical and practical issues render them unsuitable for widespread use. Here we present a Mamyshev oscillator with several key design features that enable self-starting operation and unprecedented performance and simplicity from an all-fiber laser. The laser generates 110 nJ pulses that compress to 40 fs and 80 nJ with a grating pair. The pulse energy and duration are both the best achieved by a femtosecond all-fiber laser to date, to our knowledge, and the resulting peak power of 1.5 MW is 20 times higher than that of prior all-fiber, self-starting lasers. The simplicity of the design, ease of use, and pulse performance make this laser an attractive tool for practical applications.

© 2022 Optica Publishing Group

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (4)
Fig. 1.
Fig. 1. Schematic of all-fiber MO. ISO, isolator; C, combiner; GF, gain fiber; SF, spectral filter; COL, collimator; PF, passive fiber.

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Fig. 2.
Fig. 2. Simulated evolution of the pulse through the cavity with longitudinal coordinate: (a) spectral evolution, (b) energy (top line) and root-mean-square (RMS) bandwidth (bottom line) evolution. The first 4 m of the cavity is GF; the rest of the cavity is PF. Left and right lines indicate spectral filters (SF).

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Fig. 3.
Fig. 3. (a) Compressed pulse measured by frequency-resolved optical gating (FROG). Insets show measured and retrieved FROG traces. (b) Measured spectra in logarithmic (top line) and linear (bottom line) scales. (c) Peak-power test comparing relative spectral broadening of fractions of the pulse coupled into 1 m of Hi1060 fiber (top dots) to simulated propagation of Gaussian pulses of the same energy and initial bandwidth through the same fiber (bottom dots). (d) RF spectrum at the cavity fundamental repetition rate (23.3 MHz) showing signal (top line) and background (bottom line).

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Fig. 4.
Fig. 4. Stability test. (a) Solid line shows spectrum averaged over 60 hours. Shaded area shows the standard deviation of each spectral component over that time frame. Linear scale. (b) Change in output power relative to the mean of the output power for 60 hours.

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