Jie Zong - IEEE Xplore Author Profile

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An ultra-low quantum defect (< 0.6%) linearly polarized single frequency fiber laser was demonstrated. To mitigate thermal effects, pump wavelength optimization has been performed in order to study the effect of quantum defects on laser performance.Show More
Single-frequency distributed Bragg reflector fiber laser at 915 nm was demonstrated by using a 2.5-cm long Nd3+-doped phosphate fiber as the gain medium. An output power of 13.5 mW was obtained at an absorbed pump power of 240 mW. Our experimental results show that Nd3+-doped phosphate glass fiber is more efficient than Nd3+-doped silica glass fiber for single-frequency laser operation in the 900 ...Show More
A very large mode-area 2 wt% erbium-doped double-clad phosphate fiber with a core diameter of 60 μm and core numerical aperture of 0.03 was fabricated and used for the last stage amplifier of an all-fiber pulsed laser master-oscillator power amplifier (MOPA) at 1550 nm. The Er3+ double-clad phosphate fiber has a cladding-core ratio of 2.17 and a V number of 3.6 at 1550 nm. 3 mJ pulses with 21.5 ns...Show More
L-band wavelength-tunable Er3+-doped tellurite fiber lasers in a linear cavity based on Littrow configuration were developed. Wavelength tunable range of 38 nm from 1589 to 1627 nm was achieved with in-band pump at 1570 nm.Show More
Spectroscopic properties of Nd3+-doped phosphate glass for three-level laser were investigated for the first time. A 60 nm blue-shift of the three-level transition fluorescence spectrum was achieved by changing the host material from traditional silica glass to phosphate glass. An 880-nm all-fiber laser with a world-record slope efficiency of 42.8% was demonstrated with 25-cm-long 0.25-wt.% Nd3+-d...Show More
The spectroscopic properties of Er3+-doped tellurite glasses were investigated and a 1 wt.% Er3+-doped tellurite fiber was fabricated for L-band lasers. Wavelength-tunable fiber lasers in a linear cavity based on Littrow configuration were developed and studied with different gain fiber lengths as well as output coupling ratios. Wavelength tunable range of 38 nm from 1589-1627 nm was achieved in t...Show More
D-shaped fiber deposited with single-wall carbon-nanotubes was used as fiber-optic saturable absorber to achieve Q-switched Ho3+-doped fluoride fiber laser in all-fiber configuration with superior compactness and reliability. Stable Q-switched operation at 1192 nm was established at the pump power of 290 mW. When the pump power was increased to 1280 mW, Q-switched laser with a pulse duration of 1....Show More
Highly dysprosium doped germanate-phosphate glasses were fabricated, and their magneto-optical properties were measured. The measurement results show that highly dysprosium doped germinate-phosphate glass is a promising magneto-optical material in SWIR region. © 2019 The Author(s)Show More
All-fiber single-transverse-mode laser oscillators operating at 785 nm were demonstrated by splicing a 0.1 mol% Tm3+-doped fluoride fiber with a core diameter of 4 μm and a numerical aperture of 0.07 to a pair of silica fiber Bragg gratings. About 500 mW of continuous-wave single transverse mode laser output at 784.5 nm with a 3-dB spectral bandwidth of 0.2 nm was obtained by upconversion pumping ...Show More
A diode laser pumped carbon nanotube mode-locked Ho3+-doped fluoride fiber laser at 1.2 μm was demonstrated for the first time. Stable mode-locked pulses with an average power of 1 mW at a repetition rate of 18.47 MHz were obtained at a pump power of 348 mW. The pulse energy and peak power of this mode-locked laser oscillator were about 54 pJ and 12.6 W, and were increased to 2.41 nJ and 0.54 kW, ...Show More
Mode-locked operation of a 1150 nm diode-pumped holmium-doped fluoride fiber laser at 1.2 μm based on carbon nanotube saturable absorber is reported. Mode-locked laser at 1192 nm with a repetition rate of 18.47 MHz was obtained.Show More
We report a semiconductor saturable absorber mirror Q-switched holmium (Ho3+)-doped ZrF4-BaF2-LaF3-AlF3- NaF fiber laser operating at ~1190 nm in a linear cavity. Stable Q-switched operation was established at a threshold pump power of 92.8 mW with a repetition rate of 26.1 kHz and a pulsewidth of 4 μs. The repetition rate increased and the pulsewidth decreased with an increasing pump power. When ...Show More
Q-switched operation of a holmium-doped fluoride fiber laser at 1.2 μm wavelength induced by a semiconductor saturable absorber mirror (SESAM) is reported. 650 ns pulses with 0.13 μJ pulse energy at a repetition rate of 260 kHz were obtained.Show More
We have developed a compact, yet very stable all-fiber fundamentally mode-locked 12 GHz laser system. The passively mode-locked laser centered at 1535 nm has temporal bandwidth of ~2 ps, average power of 3mW and timing jitter of 44 fs/pulse.Show More
Core-pumped 976 nm single-polarization single-frequency fiber amplifiers based on several centimeter long polarization maintaining 6 wt% ytterbium (Yb3+) doped phosphate fibers are investigated experimentally and numerically. A 350 mW linearly polarized output with >20 dB polarization extinction ratio and >50 dB optical signal-to-noise ratio is obtained from a 4 cm fiber amplifier at maximum avail...Show More
Tellurite based fibers are promising as a nonlinear fiber for supercontinuum source applications in the 2-5 micron wavelength range. These glass fibers possess both a high optical non-linearity as well as low propagation losses if prepared properly. We review recent results.Show More
Compact, efficient, narrow linewidth, fiber based THz sources have been achieved by using the monolithic high power single-frequency pulsed fiber lasers in MOPA based on difference-frequency generation (DFG) in nonlinear optical crystals. We have observed the external cavity enhancement of DFG THz generation by using ZnGeP2 for the first time, and implemented a high spectral resolution THz spectro...Show More
Compact, efficient, narrow linewidth, fiber based THz sources have been achieved by using the monolithic high power single-frequency pulsed fiber lasers in MOPA based on difference-frequency generation (DFG) in nonlinear optical crystals. We have observed the external cavity enhancement of DFG THz generation by using ZnGeP2 for the first time.Show More
Based on highly Er/Yb codoped phosphate fibers, we have implemented all-fiber-based narrow-linewidth single-mode (SM) pulsed fiber lasers in master oscillator and power amplifier configuration. Two approaches were used to achieve the narrow-linewidth pulsed fiber laser seeds: 1) an all-fiber-based active Q-switched fiber laser using an actuator and 2) a directly modulated single-frequency continuo...Show More
We report a high-power single-frequency fiber laser system in the eyesafe wavelength region that pumps a GaSe crystal through difference frequency generation, producing narrowband terahertz (THz). Two single-frequency continuous-wave fiber seed lasers are modulated, then amplified with a three-stage single-mode amplifier. The resulting pulses are transform-limited and high power, producing a peak ...Show More
We present the first demonstration of a fiber pumped source of coherent gigahertz (GHz) radiation based on parametric processes. The GHz source is compact, and pumped by two Q-switched highly codoped phosphate all-fiber lasers in a fusion-spliced master oscillator power amplifier chain at eye safe C-band wavelengths, with a GaSe crystal used for difference-frequency generation. The final stage use...Show More
In this paper, we present a novel total-internal-reflection (TIR) pump-signal coupler for coupling multimode pump light from a broad-area laser into a double-clad fiber (DCF) having small inner-clad diameters with higher pump brightness. We demonstrate a coupling efficiency exceeding 90% with negligible effect on the single-mode signal. The TIR couplers have wide application to compact high perfor...Show More