Tongxiao Jiang

1 GHz repetition rate femtosecond Yb:fiber laser for direct generation of carrier-envelope offset frequency.

We report a mode-locked fiber laser working at a 1 GHz fundamental repetition rate. The laser delivers a 600 mW average power at a pump power of 1800 mW. The pulse spectrum bandwidth was 23 nm to support 64 fs near-transform-limited pulses. An octave-spanning supercontinuum from 590 to 1350 nm was generated in a tapered photonic crystal fiber solely with the mode-locked fiber-laser output, without amplifiers. A 30 dB f(ceo) beat signal was detected via f-to-2f interferometer.

750 MHz fundamental repetition rate femtosecond Yb:fiber ring laser

We report a compact Yb:fiber ring laser operated at 750 MHz. The average output power is 210 mW at a pump power of 1.8 W. The dechirped pulse width is 68 fs.

500 MHz spaced Yb:fiber laser frequency comb without amplifiers

An optical frequency comb based on Yb:ring fiber laser was demonstrated. This is the first time, to our knowledge, f(ceo) has been generated directly from the oscillator without further amplifications above 500 MHz repetition rate. The signal-to-noise ratio of the offset frequency was above 40 dB at 300 kHz resolution bandwidth, which supports easy stabilization. The offset frequency was stabilized for more than 6 h in an open air environment without temperature control. The stabilized repetition rate has an in-loop tracking stability of 4.46×10(-13)/τ(1/2).

All PM Fiber Laser Mode Locked With a Compact Phase Biased Amplifier Loop Mirror

An Yb-doped, all-polarization-maintaining fiber laser oscillator with a nonlinear amplifying loop mirror is presented in this letter. A new compact non-reciprocal phase shifter biased fiber loop mirror was engaged inside the fiber laser, which results in a low threshold and stable mode locking. With a 2.8-nm filter inside the cavity, the mode locked output power is 4.1 mW with the repetition rate of 31.35 MHz at the pump power of 80 mW. The spectral bandwidth of the pulse is 3.1 nm. The pulsewidth of the direct output and the dechirped pulse are 2.13 ps and 538 fs, respectively. The filter bandwidth plays a significant role in the spectrum bandwidth and the direct output pulse width.

Femtosecond amplifier similariton Yb:fiber laser at a 616 MHz repetition rate

We report a compact Yb:fiber ring laser operated at 616 MHz. The average output power is 450 mW at a pump power of 900 mW. The dechirped pulse width is 98 fs.

Octave-spanning spectrum of femtosecond Yb:fiber ring laser at 528 MHz repetition rate in microstructured tellurite fiber.

The octave-spanning spectrum was generated in a tellurite glass based microstructured fiber pumped by a 528 MHz repetition rate Yb:fiber ring laser without amplification. The laser achieved 40% output optical-to-optical efficiency with the output power of 410 mW. By adjusting the grating pair in the cavity, this oscillator can work at different cavity dispersion regimes with the shortest dechirped pulse width of 46 fs. The output pulses were then launched into a high-nonlinearity tellurite fiber, which has the zero-dispersion wavelength at ~1 μm. The high nonlinearity coefficient (1348 km⁻¹W⁻¹) and the matched zero-dispersion wavelength with pump laser enable the octave-spanning supercontinuum generated from 750 nm to 1700 nm with the coupled pulse energy above 10 pJ.

Octave-spanning spectrum generation in tapered silica photonic crystal fiber by Yb:fiber ring laser above 500 MHz

We report octave-spanning spectrum generated in a tapered silica photonic crystal fiber by a mode-locked Yb:fiber ring laser at a repetition rate as high as 528 MHz. The output pulses from this laser were compressed to 62 fs. By controlling the hole expansion and core diameter, a silica PCF was tapered to 20 cm with an optimal d/Λ ratio of 0.6. Pulses with the energy of 280 pJ and the peak power of 4.5 kW were injected into the tapered fiber and the pulse spectrum was expanded from 500 to 1600 nm at the level of -30 dB.

910nm femtosecond Nd-doped fiber laser for in vivo two-photon microscopic imaging.

Pre-chirp technique was used in an Nd-doped fiber amplifier to optimize high-quality 910 nm pulses with the pulses width of 114 fs and pulse energy of 4.4 nJ. The in vivo zebrafish imaging results from our totally home-made microscopy proves our femtosecond Nd fiber laser an ideal source in two-photon microscopic imaging.

Tapered photonic crystal fiber for simplified Yb:fiber laser frequency comb with low pulse energy and robust f ceo singals

A tapered silica photonic crystal fiber was designed and fabricated to generate more than one octave spanning supercontinuum (from 550 nm to 1400 nm at -30 dB level), by an input pulse of 40 fs 200 pJ directly from an Yb:fiber ring laser. The low pulse energy spectrum broadening are favorable to generate the high contrast f ceo signals with low noise. The f ceo signal with 40 dB signal-to-noise ratio was detected, which helps to build a compact real-world frequency comb.

1 GHz repetition rate ring cavity femtosecond Yb:fiber laser

We demonstrate the first 1 GHz fundamental repetition rate ring cavity ytterbium doped fiber laser. The laser delivers 600 mW, 64fs near transform-limited pulses and supports direct octave-spanning spectrum generation.