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Rapid communications|826 Article(s)
[in Chinese]
Xiaoming Xi, Peng Wang, Baolai Yang, Chen Shi, Zilun Chen, Pengfei Ma, Hanwei* Zhang, Xiaolin** Wang, Zefeng Wang, Wenguang Liu, Kai Han, Pu Zhou, Xiaojun Xu, and Jinbao*** Chen
Acta Optica Sinica
- Publication Date: Nov. 25, 2022
- Vol. 42, Issue 22, 2238001 (2022)
2D Imaging Experiment of a 2D Target in a Laboratory-Scale Synthetic Aperture Imaging Ladar
Zhou Yu, Xu Nan, Luan Zhu, Yan Aimin, Wang Lijuan, Sun Jianfeng, and Liu Liren
The 2D imaging in both the azimuth and the range directions of a 2D target is realized in our laboratory-scale synthetic aperture imaging ladar setup. It was reached that the scan strip of ≤10 mm and the resolution of about 1.2 mm×2 mm. The 2D imaging in both the azimuth and the range directions of a 2D target is realized in our laboratory-scale synthetic aperture imaging ladar setup. It was reached that the scan strip of ≤10 mm and the resolution of about 1.2 mm×2 mm.
Acta Optica Sinica
- Publication Date: Jun. 19, 2020
- Vol. 29, Issue 7, 2030 (2009)
Two-Dimensional Imaging Experiment of a Point Target in a Laboratory-Scale Synthetic Aperture Imaging Ladar
Zhou Yu, Xu Nan, Luan Zhu, Sun Jianfeng, and Liu Liren
The 2D imaging in both the azimuth and the range directions of a point target is realized in our laboratory-scale synthetic aperture imaging ladar setup. The experimental results are identical with the predicted. The 2D imaging in both the azimuth and the range directions of a point target is realized in our laboratory-scale synthetic aperture imaging ladar setup. The experimental results are identical with the predicted.
Acta Optica Sinica
- Publication Date: Jun. 19, 2020
- Vol. 29, Issue 2, 566 (2009)
Aperture-Synthesizing Experiment of a Down-Scaled Synthetic Aperture Imaging Ladar
Zhou Yu, Sun Jianfeng, Luan Zhu, and Liu Liren
A down-scaled synthetic aperture imaging ladar (SAIL) is designed to simulate the condition of the far-field diffraction on the table of laboratory, and the techniques to monitor the qualifications of wavefront and heterodyne are developed, As a result, a target point is imaged along the azimuth direction with aperture synthesizing. The experimental results are identical with the theoretical predictions. A down-scaled synthetic aperture imaging ladar (SAIL) is designed to simulate the condition of the far-field diffraction on the table of laboratory, and the techniques to monitor the qualifications of wavefront and heterodyne are developed, As a result, a target point is imaged along the azimuth direction with aperture synthesizing. The experimental results are identical with the theoretical predictions.
Acta Optica Sinica
- Publication Date: Jun. 18, 2020
- Vol. 28, Issue 12, 2446 (2008)
Optimized Design of 3-Skip-1 Filter for 100 GHz Used in Optical Add-Drop Multiplexing
Duan Yuhua, Jing Xili, and Song Chaoqun
An optimized algorithm based on simulated annealing and genetic algorithm was provided for designing films of 3-skip-1 filters. Two antireflection layers were added to the exterior of the stack to deminish the ripple of passband. The optimized multilayer film meets the design demand of 3-skip-1 filter of 100 GHz. An optimized algorithm based on simulated annealing and genetic algorithm was provided for designing films of 3-skip-1 filters. Two antireflection layers were added to the exterior of the stack to deminish the ripple of passband. The optimized multilayer film meets the design demand of 3-skip-1 filter of 100 GHz.
Acta Optica Sinica
- Publication Date: Jun. 18, 2020
- Vol. 28, Issue 11, 2243 (2008)
Wavefront Curvature Sensor with Phase Defocus Grating
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The wavefront curvature sensor comprising a phase defocus grating is designed and fabricated. The influence of zero-order diffraction is prohibited, and the high diffractive efficiency of 49% for the ±1 diffraction orders is verified experimentally. Wavefront deformation is introduced by a phase plate. The initial wavefront measurement experiment is carried out. The Green function algorithm is used for wavefront reconstruction. The reconstructed wavefront is compared with the measurement result of the Veeco interferometer. It is verified that the measurement of the self-designed curvature sensor is correct, the error percent of peak-valley value (PV) is 10%, and the error percent of root mean square (RMS) is 2%. The wavefront curvature sensor comprising a phase defocus grating is designed and fabricated. The influence of zero-order diffraction is prohibited, and the high diffractive efficiency of 49% for the ±1 diffraction orders is verified experimentally. Wavefront deformation is introduced by a phase plate. The initial wavefront measurement experiment is carried out. The Green function algorithm is used for wavefront reconstruction. The reconstructed wavefront is compared with the measurement result of the Veeco interferometer. It is verified that the measurement of the self-designed curvature sensor is correct, the error percent of peak-valley value (PV) is 10%, and the error percent of root mean square (RMS) is 2%.
Acta Optica Sinica
- Publication Date: Jan. 01, 2007
- Vol. 27, Issue 2, 377 (2007)
Generation of High-Order Harmonic Continuum Supporting Single Attosecond Pulse in Argon Driven by Intense 7 fs Laser Pulse
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Highorder harmonic continuum in the cutoff region is demonstrated with an argon gas cell driven by 7 fs/0.4 mJ ultrashort intense laser pulses. It is found that the spectral structure, modulation depth and continuum bandwidth vary greatly when the carrier envelope phase (CEP) of driving laser pulse is stabilized at different value. At some CEP value, a smooth continuous spectrum with modulation depth less than 17% and 10 eV continuum bandwidth is achieved, supporting a transformlimited single 500 as pulse in time domain. Highorder harmonic continuum in the cutoff region is demonstrated with an argon gas cell driven by 7 fs/0.4 mJ ultrashort intense laser pulses. It is found that the spectral structure, modulation depth and continuum bandwidth vary greatly when the carrier envelope phase (CEP) of driving laser pulse is stabilized at different value. At some CEP value, a smooth continuous spectrum with modulation depth less than 17% and 10 eV continuum bandwidth is achieved, supporting a transformlimited single 500 as pulse in time domain.
Acta Optica Sinica
- Publication Date: Jan. 01, 2006
- Vol. 26, Issue 9, 1439 (2006)
Coherent Output Power of 60 W from Two Large-Core Double-Cladding Fiber Lasers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A phase-locking fiber laser array with up to 60 W of coherent output power based on two large-core fiber is reported. The slope efficiency of the in-phase mode is 37%. For the two core space cases, the steady high-contrast interference strips are observed. When the whole system operates under high pump power level, no thermal effects for the spatial filter have been observed, which means that we can increase the coherent output power further by increasing the individual fiber laser power. A phase-locking fiber laser array with up to 60 W of coherent output power based on two large-core fiber is reported. The slope efficiency of the in-phase mode is 37%. For the two core space cases, the steady high-contrast interference strips are observed. When the whole system operates under high pump power level, no thermal effects for the spatial filter have been observed, which means that we can increase the coherent output power further by increasing the individual fiber laser power.
Acta Optica Sinica
- Publication Date: Jan. 01, 2006
- Vol. 26, Issue 8, 1279 (2006)
A Continuous-Wave 714 W Fiber Laser With China-Made Large-Mode-Area Double-Clad Fiber
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A continuous-wave (CW) fiber laser with 714 Watts output power has been obtained from 21 meters Chia-made Ytterbium-doped large-mode-area double-clad fiber. Two high-power collimated beam laser diodes (wavelenth 976 nm) with spatial filter and aspheric lens are used for pumping from the two ends of the fiber. A CW output power of 501 W is obtained under pump power of 760 W with backward pumping scheme. And the maximum output power of 714.5 W is realised under total pump power of 1137 W with double-sided end-pumping scheme, the optical-to-optial efficiency and the slope efficiency whicd respect to the launched pump power are 62.8% and 67%, respectively. A continuous-wave (CW) fiber laser with 714 Watts output power has been obtained from 21 meters Chia-made Ytterbium-doped large-mode-area double-clad fiber. Two high-power collimated beam laser diodes (wavelenth 976 nm) with spatial filter and aspheric lens are used for pumping from the two ends of the fiber. A CW output power of 501 W is obtained under pump power of 760 W with backward pumping scheme. And the maximum output power of 714.5 W is realised under total pump power of 1137 W with double-sided end-pumping scheme, the optical-to-optial efficiency and the slope efficiency whicd respect to the launched pump power are 62.8% and 67%, respectively.
Acta Optica Sinica
- Publication Date: Jan. 01, 2006
- Vol. 26, Issue 7, 1119 (2006)
Laser Diode-Pumped Efficient Tunable YbLYSO Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We demonstrate continuous-wave laser action in a Yb3+-doped lutetium Yttrium oxyorthosilicate (YbxLuyY1-x-y)2SiO5(YbLYSO) crystal (0.001≤x≤0.5, 0≤y≤0.8). In the free-running operation, we obtained an output power as high as 7.8 W centered about 1086 nm for a 2.5% output coupler, corresponding to a slope efficiency of 64%. Using a SF14 prism as an intracavity tuning element, the tunability of the YbLYSO laser in the spectral range of 1014～1091 nm has been achieved. We demonstrate continuous-wave laser action in a Yb3+-doped lutetium Yttrium oxyorthosilicate (YbxLuyY1-x-y)2SiO5(YbLYSO) crystal (0.001≤x≤0.5, 0≤y≤0.8). In the free-running operation, we obtained an output power as high as 7.8 W centered about 1086 nm for a 2.5% output coupler, corresponding to a slope efficiency of 64%. Using a SF14 prism as an intracavity tuning element, the tunability of the YbLYSO laser in the spectral range of 1014～1091 nm has been achieved.
Acta Optica Sinica
- Publication Date: Jan. 01, 2006
- Vol. 26, Issue 5, 799 (2006)
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