Picosecond to femtosecond pulses from high power self mode–locked ytterbium rod-type fiber laser

Abstract

We have designed an ytterbium rod-type fiber laser oscillator with tunable pulse duration. This system that delivers more than 10 W of average power is self mode-locked. It yields femtosecond to picosecond laser pulses at a repetition rate of 74 MHz. The pulse duration is adjusted by changing the spectral width of a band pass filter that is inserted in the laser cavity. Using volume Bragg gratings of 0.9 nm and 0.07 nm spectrum bandwidth, this oscillator delivers nearly Fourier limited 2.8 ps and 18.5 ps pulses, respectively. With a 4 nm interference filter, one obtains picosecond pulses that have been externally dechirped down to 130 fs.

Implementation of all-optical synchronous and asynchronous binary up counters using silicon micro-ring resonator

“…The speed of the proposed circuit depends on the pulse width and pulse period of the applied pump source. For our design, we used a picosecond mode-locked fiber laser as the pump signal with a pulse duration of 3.75 ps 24 , 25 . From the simulation result of Fig.…”

“…The absorption coefficient of silicon is much higher at the wavelength of 400 nm, 23 and the desirable pump source of this wavelength is easily available commercially. We use the picosecond mode-locked fiber laser as the pump signal with a pulse duration 3.75 ps 24 , 25 and applied it through the add port of the MRR, which is shown in Fig. 1.…”

Tunable and chirp free femtosecond signal pulses generated by a PPLN OPO pumped by Ytterbium fiber laser chirped pulses

“…This makes it possible to generated Fourier transform-limited femtosecond pulses. Hereafter, we show that when chirped pump pulses are used, one can also generate a signal pulse Fourier transform-limited without using chirped PP crystal taking advantage of velocity group delay and velocity group dispersion between the pump and signal in the PP crystal [4]. Accordingly, we show that a slight detuning of the resonator-length makes it possible to generate almost chirped free signal pulse at the expense of a reasonable decrease of the conversion efficiency.…”

“…The autocorrelation trace of the signal and pump pulses are measured with a homemade autocorrelator using a 300 µm thick BBO crystal. Our OPO is pumped by an all-normal-dispersion ytterbium fibered oscillator 4 . The linearly polarized and chirped pump pulse centered at  p =1035 nm has a duration at a spectral bandwidth of ~1.06 ps ( Fig.…”

Femtosecond OPO pumped by a high power ytterbium rod-type fiber laser mode locked at harmonic repetition rates

“…1. The core of the set-up is a femtosecond high-power, self-mode-locked ytterbium rod-type fiber laser, which has been described elsewhere [22], and a linear and singly resonant OPO cavity built around a periodically polarized and MgO-doped lithium niobate crystal (MgO-PPLN). The duration of the pulses delivered by the laser and the OPO are measured using two homemade intensity autocorrelators.…”