Output Pulse Characteristics of a Mamyshev Fiber Oscillator

Abstract

The dependence of the output pulse characteristics of a Mamyshev fiber oscillator on cavity parameters is investigated in detail. We analyze the change in pulse spectrum bandwidth, pulse duration, dechirped pulse duration and chirp with the change in fiber group velocity dispersion, fiber nonlinearity, gain, and filters by putting forward a numerical model. In particular, as one of the most important components, the effect of filters bandwidth and the central wavelength interval between them is discussed. The passive fibers are classified into two kinds according to their locations in the cavity, which are the one before the gain fiber and the one after the gain fiber. Numerical simulation results show that a wide spectrum can be obtained by increasing the nonlinearity of the second passive fiber, while the change in nonlinearity of the first passive fiber has a weak effect on spectrum broadening. A wide spectrum could also be obtained by increasing the nonlinearity or the small-signal gain coefficient of the gain fiber. A Yb-doped Mamyshev fiber oscillator is demonstrated. The results show the increase in pump power, which agrees reasonably well with the numerical simulation results.

Recent advance of high-energy ultrafast mode-locked oscillators based on Mamyshev mechanism with different starting modes

“…And Mamyshev fiber oscillator is established with Yb-doped fiber to confirm the credibility of simulation results. An average power of 130 mW is obtained, with a pulse energy of 8.6 nJ 63 . In 2022, Haig et al.…”

“…An average power of 130 mW is obtained, with a pulse energy of 8.6 nJ. 63 57 the laser robust to environmental perturbation, and the design gives a route toward fully fiberintegrated oscillators with pulse energy approaching 100 nJ. 64 In 2022, the group demonstrated for the first time a ring Mamyshev oscillator with a passive arm that enables self-starting operation.…”

Advances and Challenges of Ultrafast Fiber Lasers in 2–4 µm Mid‐Infrared Spectral Regions

“…[252] Mamyshev oscillator was first proposed as an artificial SA with a modulation depth of 100% in 1998, which suppressed noise and continuous light output, but also required injecting an initial pulse to start with. [253] In 2020, Repgen et al realized a Tm 3+ -doped fiber Mamyshev oscillator in 2 μm mid-IR with a compressed pulse of 208 fs and pulse energy of 3.5 nJ. [22] The schematic, output spectrum, and autocorrelation trace of the laser are shown in Figure 19a-c.…”