Fiber Ring Oscillator Research Articles

Pattern formation in 2-μm Tm Mamyshev oscillators associated with the dissipative Faraday instability

We investigate numerically the pattern formation in 2-μm thulium-doped Mamyshev fiber oscillators, associated with the dissipative Faraday instability. The dispersion-managed fiber ring oscillator is designed with commercial fibers, allowing the dynamics for a wide range of average dispersion regimes to be studied, from normal to near-zero cavity dispersion where the Benjamin–Feir instability remains inhibited. For the first time in the 2-μm spectral window, the formation of highly coherent periodic patterns is demonstrated numerically with rates up to ∼100 GHz. In addition, irregular patterns are also investigated, revealing the generation of rogue waves via nonlinear collision processes. Our investigations have potential applications for the generation of multigigahertz frequency combs. They also shed new light on the dissipative Faraday instability mechanisms in the area of nonlinear optical cavity dynamics.

Femtosecond Yb:YGAG ceramic slab regenerative amplifier

We present a femtosecond regenerative Yb:YGAG (Y3Ga2Al3O12) ceramic slab amplifier delivering 405 fs pulses at a wavelength of 1030 nm with a bandwidth limit of 306 fs, 1.1 W of average power, 8 μJ of pulse energy, and a repetition rate of 100 kHz. The amplifier is seeded by 9 pJ pulses generated by a Yb-doped fiber ring oscillator with extra-cavity spectral shaping to minimize gain narrowing. The net-gain of the pulses is 60 dB, the spectral bandwidth is 4.1 nm (FWHM), and the M2 beam quality factor is < 1.2. Due to similar optical and thermo-mechanical properties to Yb:YAG, the Yb:YGAG gain medium is a promising alternative for upgrading the existing Yb:YAG picosecond disk amplifiers to the femtosecond regime.

Low noise, tunable Ho:fiber soliton oscillator for Ho:YLF amplifier seeding

We present a passively mode-locked, tunable soliton Ho:fiber ring oscillator, optimized for seeding of holmium-doped yttrium lithium flouride (Ho:YLF) amplifiers. The oscillator is independently tunable in central wavelength and spectral width from 2040 to 2070 nm and from 5 to 10 nm, respectively. At all settings the pulse energy within the soliton is around 800 pJ. The soliton oscillator was optimized to fully meet the spectral requirements for seeding Ho:YLF amplifiers. Its Kelly sidebands are located outside the amplifier gain spectrum, resulting in a train of about 1 ps long pedestal-free pulses with relative intensity noise of only 0.13% RMS when integrated from 1 Hz to Nyquist frequency.

Widely Tunable Single-Mode Yb-Doped All-Fiber Master Oscillator Power Amplifier

A Yb-doped linearly polarized fiber ring oscillator continuously tunable from 1000 to 1099 nm is built and amplification over the whole range is investigated with emphasis on the short wavelength regime of 1000–1025 nm. With an all-fiber single-mode polarization-maintaining master oscillator power amplifier, over 10 W output from 1010 to 1090 nm and over 30 W from 1014 to 1080 nm are achieved. At wavelength <1020 nm, bandpass filters are inserted for suppressing amplified spontaneous emission. The source can be used in a variety of applications, including laser cooling of Yb-doped solids.

All-fiber passively mode-locked thulium-doped fiber ring laser using optically deposited graphene saturable absorbers

An all-fiber passively mode-locked thulium-doped fiber ring oscillator is constructed using optically deposited few layer graphene micro-sheets as the saturable absorber (SA). The mode-lock operation was achieved by 130-mW pump power at 1.5-μm. The fiber oscillator produces 2.1-ps soliton pulse output with 80-pJ per pulse energy. The 3-dB bandwidth of the laser output was measured as 2.2-nm. The RF signal-to-noise ratio of 50-dB and sub 20-Hz 3-dB bandwidth of the laser output confirms the stable laser operation with low time jittering. This paper shows that graphene can be an effective saturable absorber for the development of mid-IR fiber mode-locked laser.

All-fiber passively mode-locked thulium-doped fiber ring oscillator operated at solitary and noiselike modes

This Letter presents an all-fiber mode-locked thulium-doped fiber ring oscillator based on nonlinear polarization evolution (NPE). Pumped by an erbium-doped fiber amplified spontaneous emission source, the construction of the laser cavity consisting of only fiber optic components can operate under two different regimes of solitary and noiselike (NL) pulses. Autocorrelation measurements are performed to extract features of these two regimes.

Injection-Seeded&amp;lt;tex&amp;gt;$Q$&amp;lt;/tex&amp;gt;-Switched Fiber Ring Laser

We present a narrow linewidth, injection-seeded Q-switched Er fiber ring oscillator, that provides over 600 /spl mu/W of average output power at 500 Hz, with 1.2 /spl mu/J per pulse, before the output appears to be significantly affected by stimulated Brillouin scattering. This laser configuration provides multiple advantages in LIDAR systems because it offers the possibility of broad and rapid tunability.

Optical clock repetition-rate multiplier for high-speed digital optical logic circuits

Repetition-rate multiplication has been shown by use of a fiber ring oscillator with a semiconductor optical amplifier as the gain medium and by use of fast saturation and recovery of the amplifier from an external optical pulse train. Repetition-frequency multiplication up to 6 times and up to 34.68-GHz frequency have been achieved.

Intense picosecond pulse generation in the 580–610 nm region from a pure SiO 2-core fiber ring oscillator synchronously pumped by a Nd: YAG laser at 1.319 µm

Generation of intense picosecond pulses in the 580–610 nm region, from a frequency upconversion pure Si0 2-core fiber ring oscillator, is described. The single-mode fiber ring oscillator was synchronously pumped by a Q-switched and mode-locked Nd: YAG laser operated at 1.319 µmm. The oscillator produced pulses at 100 MHz with less than 90 ps duration and peak powers as high as 120 W. The pulses resided in 300 ns duration Gaussian shaped Q-switch bursts at repetition rates of up to 1.5 kHz.

Cascade Raman soliton fiber ring laser

Pulses as short as 200 fsec at 1.5 microm and 230 fsec at 1.6 microm have been generated through a cascade Raman, solitonlike process in a fiber ring oscillator. A dispersion-shifted (lambda(0) = 1.46 microm) single-mode fiber was used as the gain medium, which was synchronously pumped by a cw mode-locked Nd:YAG laser operated at 1.32 microm.