胡明列
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- 姓名:胡明列
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半导体技术
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4057
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521
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成果数
13
胡明列
,-0001,():
-1年11月30日
A high pulse energy passively mode-locking fiber laser operating in the soliton-like regime is demonstrated. The laser is based on a linear cavity design. A segment of Yb-doped single-polarization large-mode-area photonic crystal fiber serves as the gain medium, and the self-starting mode-locking is achieved by a high contrast semiconductor saturable absorber mirror. The laser directly generates 600-fs pulses with 900 mW of average power at a repetition rate of 47.3 MHz, corresponding to a single pulse energy of 19 nJ. Furthermore, this fiber laser is directly used for pumping ZnTe to generate broadband terahertz radiation, resulting in a compact terahertz source.
Femtosecond laser,, fiber oscillator,, photonic crystal fiber (, PCF), ,, terahertz wave.,
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胡明列
,-0001,():
-1年11月30日
Frequency-shifted dispersive optical waves generated as a result of soliton dynamics of 30-fs Ti: sapphire-laser pulses in an array of waveguiding wires, implemented on a platform of a photonic-crystal fiber (PCF), are shown to produce regular stable interference patterns with high visibility, indicating a high coherence of frequency-shifted fields. For a hexagonal array of waveguides built into a silica PCF, the field intensity at the main peak of a six-beam interference pattern was found to be a factor of 22 higher than the intensity of a frequency-shifted signal from an individual waveguide in the array and 3.7 times higher than the field intensity attainable through an incoherent superposition of the same fields.
Nonlinear optics,, fibers,, Ultrafast nonlinear optics
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胡明列
,-0001,():
-1年11月30日
Fiber dispersion and nonlinearity management strategy based on a modification of a photonic-crystal fiber (PCF) core with an air hole is shown to facilitate optimization of PCF components for a stable soliton frequency shift and subpetahertz sideband generation through four-wave mixing. Spectral recoil of an optical soliton by a red-shifted dispersive wave, generated through a soliton instability induced by high-order fiber dispersion, is shown to stabilize the soliton self-frequency shift in a highly nonlinear PCF with an air-hole-modified core relative to pump power variations. A fiber with a 2.3-μm-diameter core modified with a 0.9-μmdiameter air hole is used to demonstrate a robust soliton self-frequency shift of unamplified 50-fs Ti: sapphire laser pulses to a central wavelength of about 960 nm, which remains insensitive to variations in the pump pulse energy within the range from 60 to at least 100 pJ. In this regime of frequency shifting, intense high- and low-frequency branches of dispersive wave radiation are simultaneously observed in the spectrum of PCF output. An air-hole-modified-core PCF with appropriate dispersion and nonlinearity parameters is shown to provide efficient four-wave mixing, giving rise to Stokes and anti-Stokes sidebands whose frequency shift relative to the pump wavelength falls within the subpetahertz range, thus offering an attractive source for nonlinear Raman microspectroscopy.
Nonlinear optics,, fibers,, Ultrafast nonlinear optics.,
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【期刊论文】A hollow beam from a holey fiber
胡明列, Ming-Lie Hu, Ching-Yue Wang, You-Jian Song, Yan-Feng Li, Lu Chai, Evgenii E. Serebryannikov, Aleksei M. Zheltikov
OPTICS EXPRESS 4129. 1 May 2006, Vol.14, No.9,-0001,():
-1年11月30日
A high-quality spectrally isolated hollow beam is produced through a nonlinear-optical transformation of Ti: sapphire laser pulses in a higher order mode of a photonic-crystal fiber (PCF). Instead of a doughnut shape, typical of hollow beams produced by other methods, the far-field image of the hollow-beam PCF output features perfect sixth-order rotation symmetry, dictated by the symmetry of the PCF structure. The frequency of the PCF-generated hollow beam can be tuned by varying the input beam parameters, making a few-mode PCF a convenient and flexible tool for the guiding and trapping of atoms and creation of all-fiber optical tweezers.
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胡明列, M. HU, , C. -Y. WANG, Y. LI, Z. WANG, L. CHAI, Y.N. Kondrat’ev, C. Sibilia, A.M. Zheltikov
Applied Physics B. 79, 805–809 (2004),-0001,():
-1年11月30日
Nonlinear-optical spectral transformation of unamplified 30-fs Ti: sapphire laser pulses in a birefringent fused-silica photonic-crystal fiber is shown to result in the efficient generation of a doublet of two physically distinct states of the anti-Stokes radiation field. These states, corresponding to the first doublet of high-order guided modes of the photonic-crystal fiber, have close spectral contents, but different intensity profiles and different beam-pattern geometries relative to the cross-section structure of the fiber. We demonstrate that these two states of the anti-Stokes field are robust with respect to fiber bending and can be independently generated, as well as selectively addressed and controlled, due to the fiber birefringence, with orthogonal polarizations of the input pump field.
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胡明列, Ming Lie Hu, Ching-yue Wang, Lu Chai, Aleksei M. Zheltikov
OPTICS EXPRESS. 3 May 2004, Vol.12 No.9 ,-0001,():
-1年11月30日
Birefringent microstructure fibers are shown to allow efficient generation of frequency-tunable anti-Stokes line emission as a result of nonlinear-optical spectral transformation of unamplified femtosecond Ti: sapphire laser pulses. Femtosecond pulses of 820-nm pump radiation polarized along the fast and slow axes of the elliptical core of the microstructure fiber generate intense blue-shifted lines centered at 490 and 510 nm, respectively, observed as bright blue and green emission at the output of a 10-cm microstructure fiber.
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胡明列, Ming-Lie Hu, Ching-Yue Wang, You-Jian Song, Yan-Feng Li, Lu Chai, Evgenii E. Serebryannikov, Aleksei M. Zheltikov
OPTICS EXPRESS. 6 February 2006, Vol.14, No.3,-0001,():
-1年11月30日
We demonstrate an experimental technique that allows a mapping of vectorial nonlinear-optical processes in multimode photoniccrystal fibers (PCFs). Spatial and polarization modes of PCFs are selectively excited in this technique by varying the tilt angle of the input beam and rotating the polarization of the input field. Intensity spectra of the PCF output plotted as a function of the input field power and polarization then yield mode-resolved maps of nonlinear-optical interactions in multimode PCFs, facilitating the analysis and control of nonlinear-optical transformations of ultrashort laser pulses in such fibers.
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胡明列, Minglie Hu, Ching-yue Wang, Yanfeng Li, Zhuan Wang, Lu Chai, Aleksei M. Zheltikov
OPTICS EXPRESS. 13 December 2004, Vol.12, No.25,-0001,():
-1年11月30日
An array of fused silica waveguiding channels with randomly distributed transverse sizes in a disordered microstructure fiber is shown to allow a highly efficient broadly tunable frequency conversion of low-energy ultrashort laser pulses. Dispersion can be switched in such waveguide arrays by coupling the pump field into waveguiding wires with different diameters. Microstructure-fiber-integrated random arrays of waveguides with diameters ranging from 0. 6 up to 1.5
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【期刊论文】Polarization-and Mode-Dependent Anti-Stokes Emission in a Birefringent Microstructure Fiber
胡明列, Ming-Lie Hu, Ching-Yue Wang, Yan-Feng Li, Zhuan Wang, Lu Chai, A. M. Zheltikov
IEEE PHOTONICS TECHNOLOGY LETTERS, VOL.17, NO.3, MARCH 2005,-0001,():
-1年11月30日
We have studied the polarization dependence of frequency-upconversion of 35-fs pulses of 820-nm Ti: sapphire laser radiation in a birefringent microstructure fiber with a high air-filling-fraction cladding. The central wavelength of frequency-upconverted radiation and its transverse intensity profile are controlled in our experiments through a selective coupling of the pump field into higher order modes of the fiber and polarization-sensitive phasematching in parametric four-wave mixing, allowing the central wavelength of the anti-Stokes fiber output to be tuned and its transverse intensity profile to be modified by varying the polarization state of the input pump field.
Optical fiber fabrication, optical phase matching, optical propagation in nonlinear media, ultrafast optics
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胡明列, Ming-Lie Hu, Ching-Yue Wang, Yan-Feng Li, Lu Chai, Aleksei M. Zheltikov
OPTICS EXPRESS. 8 August 2005, Vol.13, No.16,-0001,():
-1年11月30日
Birefringent photonic-crystal fibers provide efficient polarization-sensitive anti-Stokes frequency conversion of unamplified 35fs Ti: sapphire laser pulses, giving rise to a doublet of intense blue-shifted emission spectral lines centered at 490 and 510 nm. We show that this anti-Stokes doublet can be wavelength-demultiplexed by a polarization-separating prism. Generation of the 510-nm signal is decoupled from frequency conversion to 490 nm by accurately polarizing the pump field along one of the principal axes of the elliptically deformed fiber core.
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