We demonstrated a multi-dark soliton train generated from self-mode-locking ultra-long ring cavity fiber laser. The fiber laser used 10m double-clad Yb-doped fiber as gain medium, and used a polarization independent isolator to ensure the light propagation in one direction. The ring cavity of the laser was designed without any intra-cavity polarization controlling component. The cavity length is 1300 meters by insetting single mode fiber. When the pump power was increased to 2.75W, the multi-dark soliton trains were obtained. The stable pulse train has a repetition rate of 153.9 kHz corresponding to the cavity length. The number of sub-pulse continues to decrease during the increase of the incident pumping power until 3.39W. Stable three peaks appear in the spectra of our fiber laser due to the absence of the polarization controller in the cavity. The maximum peak wavelength locates around 1083.9nm with the 3dB bandwidth of 1.4nm. There are two sidebands with the central wavelength of 1086.3nm and 1090.1nm with a lower intensity. The occurrence of multi-dark soliton pulses train is relevant to the self-mode-locked operation at the cavity with a large amount of normal dispersion and accumulated nonlinearity.
In this paper, a mode-locked Ytterbium-doped fiber laser based on nonlinear optical loop mirror (NOLM) is proposed. The laser generates a wide-spectrum dissipative soliton resonance mode-locked pulse with strong stimulated Raman scattering. The fiber laser is pumped forward, and the fiber ring cavity contains double-cladding Yb-doped fiber, output coupler, polarization controller, polarization independent isolator and other elements. NOLM is connected with the ring cavity by through a 3dB beam splitter and 25m single-mode fiber. The total length of the eight-shape cavity laser is about 60meters. By adjusting the intra-cavity polarization controller, a stable dissipative soliton resonance mode-locked spike pulse can be achieved. The repetition frequency of the pulse train is 3.44MHz, which is consistent with the cavity length. The 3dB bandwidth of the spectrum reaches 70.6nm, and the 10dB bandwidth is close to 147.11nm. In this experiment, dissipative soliton resonance mode-locked pulses with wide spectrum and high pulse energy are realized by a traditional mode-locking method, which has wide application in many fields such as laser spectral detection and terahertz wave generation.
A nonstandard type of Yb:YAG laser intracavity pumped by an all-solid-state Nd : LuVO4 laser at the wavelength of 916 nm around the 915-nm absorption peak of Yb3 + is presented. A model is derived to improve the 1030-nm output power of the Yb:YAG laser by optimizing the absorption ratio of Yb:YAG at the 916-nm pump wavelength. Both the continuous wave (CW) and pulsed performances of the presented laser are experimentally investigated. At the maximal diode pump level of 18 W, a 5.63-W output power (CW) and a 3.71-W average output power (pulsed) at 1030 nm are achieved, corresponding to optical conversion efficiencies of 31.3% and 20.6%, respectively.
Fiber laser sensor based on multimode interference (MMI) effect can achieve high sensitivity with lower temperaturestrain cross sensitivity by designing optimally the MMI structure. An erbium-doped fiber laser for temperature, stress and refractive sensing based on single mode fiber spliced a short section of no-core fiber was proposed in this paper. The optical field characteristics of this MMI structure have been analyzed, indicating the spectral filtering effect existed. An erbium-doped fiber laser with the MMI structure inserted as the sensor element, the enhanced sensing sensitivity is achieved on the sensing experiments of ambient temperature, mechanical stress and liquid refractive index. The sensitivity of this MMI-based fiber laser sensor is up to 13.24 pm/°C with the measured range from 30 °C to 220 °C, 1.29pm/με from 0 to 7776.05με, 180.21nm/RIU from 1.34 to 1.42, respectively.
High power fiber laser was demonstrated by using Yb-doped double-clad fiber based on laser cavity consisted of both fiber Bragg gratings spliced onto fiber ends, which pumped by a fiber-coupled multimode laser diode (FMLD) with 970nm central wavelength. In our experiment star-shape double clad Ytterbium-doped fiber was used, the MAX output
power and center wavelength is 6W cw and central wavelength of 1100nm respectively, FWHM is about 0.66nm, the slope efficiency is about 51%.
Multiple quantum wells (MQW) microdisk lasers are fabricated by using the methods of photolithography-etching techniques. By the CCD watching-control and micron-area detecting systems, The 5µm-diameter microdisk lasers was optically pumped by Ar+ pulse laser at room temperature, with the 1:50 pump duty cycle. We obtained the single-mode lasing at 1.543m wavelength, with threshold pump power about 200µw.
In this work InGaAs/InGaAsP/InP microcylinder lasers with diameter of 10 micrometers were fabricated by wet chemical etching. At liquid nitrogen temperature the lasers show lasing at 1.55 micrometers when electrically pumped with pulse width 300 ns and cycle of 200 microsecond(s) . The threshold current is about 3 mA.
Here we report a simulation of bending loss of a photonic wire ring resonator. The ring resonator and waveguide core are composed of InGaAs/InGaAsP, which is isolated by an InP spacer. The waveguide core below the ring resonator could be used as a bus waveguide. The dependence of coupling coefficient on the thickness of InP spacer is calculated.
Silicon-based photonic wire waveguide was designed. The waveguide was consisted of a sandwiched structure with a nanocrystalline silicon film embedded between two low index silicon oxide films. The conformal transformation method was used in the simulation to obtain the basic coupling characteristics. The results showed that the coupling coefficient was strongly dependent on the gap spacing and the radius of the ring waveguide. A coupling efficiency of 10% could be obtained when the gap spacing was about 0.3 micrometers .
The semiconductor microcylinder lasers with whispering-gallery modes are expected to be with execllent performances, such as low threshold current density and high efficiency. The spontaneous emission characteristics of microcylinder laser due to microcavity effect is strongly modified. Another excellence of whispering-gallery mode devices is that the probability of planar integration with waveguide devices and detectors. In this work InGaAs/InGaAsP microcylinder laser was fabricated by wet chemical etching. The diameter of the microcylinder is about 10micrometers or 5micrometers . With our improved processing the microcylinder was with smooth side wall, ensuring high Q-factor. The lasing at about 1.5micrometers was observed at low temperature.
The lasing modes and the spontaneous emission factors of microdisk lasers are analyzed simply, in this paper, InGaAs/InGaAsP multiple quantum wells (MQW) microdisk lasers are fabricated by using the methods of active ion etching and selective chemical etching. The diameter of the microdisk lasers was 3 micrometers . InGaAs/InGaAsP MQW microdisk lasers was optically pumped when cooled with liquid nitrogen. We obtained the single-mode lasing at 1.5 micrometers wavelength, with threshold pump power 18 (mu) w.
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