Journals >Chinese Optics Letters
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2015
Volume: 13 Issue 6
21 Article(s)
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Fourier Optics and Signal Processing
Broadband shifting luminescence in Cr3+/Yb3+ codoped Y3Al5O12 thin films by pulsed laser deposition
Yinzhen Wang, Ning Li, Pingping Duan, Junyong Deng, Liaolin Zhang, Benli Chu, and Qinyu He
Cr3+/Yb3+ codoped Y3Al5O12 (i.e., YAG) thin films are prepared by pulsed laser deposition. The films are characterized by X-ray diffraction, atomic force microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectra. Excitation at 446 or 587 nm, a broadband emission in thCr 3 + / Yb 3 + Y 3 Al 5 O 12 Cr 3 + Yb 3 + Cr 3 + / Yb 3 +
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060701 (2015)
Filtering characteristics of spatial filter for spatial filtering velocimeter
Xin He, Jian Zhou, Xiaoming Nie, and Xingwu Long
In order to select a suitable spatial filter for the spatial filtering velocimeter, the filtering characteristics of the spatial filters with a rectangular window and rectangular transmittance are investigated by the power spectrum of transmittance function method. The filtering characteristics of differential filters In order to select a suitable spatial filter for the spatial filtering velocimeter, the filtering characteristics of the spatial filters with a rectangular window and rectangular transmittance are investigated by the power spectrum of transmittance function method. The filtering characteristics of differential filters are investigated and compared with that of common ones. The influences of the number of spatial periods on the spectral bandwidth, deviation to central frequency, and peak transmittance are deeply analyzed. The results show that the influence is due to the form of superposition of the signal components and other components, the pedestal and higher-order components, and the superposition results from the finite size of the spatial filter. According to the results, a method is proposed to compensate for the deviation to central frequency..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060702 (2015)
Holography
Enhancement on the generation of sampled phase-only holograms
P. W. M. Tsang, Y. T. Chow, and T.-C. Poon
Past research has demonstrated that if the intensity image of an object is uniformly down-sampled and converted into a Fresnel hologram, the phase component alone will be sufficient to reconstruct the source image. However, due to down-sampling, the edge and line patterns are degraded heavily. In this Letter, we proposPast research has demonstrated that if the intensity image of an object is uniformly down-sampled and converted into a Fresnel hologram, the phase component alone will be sufficient to reconstruct the source image. However, due to down-sampling, the edge and line patterns are degraded heavily. In this Letter, we propose an enhancement on the parent method by incorporating an adaptive down-sampling lattice. A hologram generated with our proposed method, which is referred to as the edge-enhanced sampled phase-only hologram, preserves favorable visual quality on both the shaded regions as well as the edge patterns of the object image..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060901 (2015)
Instrumentation, Measurement, and Metrology
Fiber-based radio frequency dissemination for branching networks with passive phase-noise cancelation
Yu Bai, Bo Wang, Chao Gao, Jing Miao, Xi Zhu, and Lijun Wang
We demonstrate a new fiber-based radio frequency (RF) dissemination scheme suitable for a star-shaped branching network. Without any phase controls on the RF signals or the use of active feedback-locking components, the highly stable reference frequency signal can be delivered to several remote sites simultaneously andWe demonstrate a new fiber-based radio frequency (RF) dissemination scheme suitable for a star-shaped branching network. Without any phase controls on the RF signals or the use of active feedback-locking components, the highly stable reference frequency signal can be delivered to several remote sites simultaneously and independently. The relative frequency stabilities of 6 × 10 15 / s 7 × 10 17 / 10 4 s
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061201 (2015)
Lasers and Laser Optics
Diode-pumped Nd:YLF slab master oscillator power amplifier laser system with 655 mJ output at 50 Hz repetition rate
Qi Yang, Xiaolei Zhu, Jian Ma, Tingting Lu, Xiuhua Ma, and Weibiao Chen
A laser-diode-pumped high-pulse-energy Nd:LiYF4 master oscillator power amplifier 1053 nm laser system is demonstrated. We design a home-made pump module to homogenize the pump intensity through the ray tracing method. To increase the extraction efficiency, the pre-amplifier adopts a double-pass amplification structureA laser-diode-pumped high-pulse-energy Nd:LiYF4 master oscillator power amplifier 1053 nm laser system is demonstrated. We design a home-made pump module to homogenize the pump intensity through the ray tracing method. To increase the extraction efficiency, the pre-amplifier adopts a double-pass amplification structure. At a repetition rate of 50 Hz, 655 mJ pulse energy and 12.9 ns pulse width of 1053 nm laser is obtained from the master oscillator power amplifier system. The corresponding peak power is 51 MW. The optical-to-optical efficiency of the system is about 9.7%..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061401 (2015)
One-step formation of multifunctional nano- and microscale structures on metal surface by femtosecond laser
Haiyan Tao, Xiaowei Song, Zuoqiang Hao, and 景全 林
Metals in nature exhibit a mediocre wettability and a high optical reflectance from the visible region to the infrared. This Letter reports that, by formation of nano- and microscale structures via a simple raster scanning of a focused femtosecond laser pulse without any further treatment, structured aluminum and nickeMetals in nature exhibit a mediocre wettability and a high optical reflectance from the visible region to the infrared. This Letter reports that, by formation of nano- and microscale structures via a simple raster scanning of a focused femtosecond laser pulse without any further treatment, structured aluminum and nickel surfaces exhibit combined features of superhydrophobicity with a contact angle of 155.5°, and a high optical absorption with a reflectivity of several percent over a broad spectral range (0.2–2.5 μm). Thus, a multifunctional structured metal surface that integrates superhydrophobicity and a high broadband absorptivity has been easily realized by one-step femtosecond laser processing..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061402 (2015)
Spectral characteristics of arc plasma during laser-arc double-sided welding for aluminum alloy
Kezhao Zhang, Zhenglong Lei, Xianglong Wang, Yanbin Chen, and Yaobang Zhao
In laser-arc double-sided welding, the spectral characteristics of the arc plasma are calculated and analyzed by spectroscopic diagnosis. The results show that, compared with conventional tungsten inert gas (TIG) welding, the introduction of a laser changes the physical characteristics of the arc plasma regardless of wIn laser-arc double-sided welding, the spectral characteristics of the arc plasma are calculated and analyzed by spectroscopic diagnosis. The results show that, compared with conventional tungsten inert gas (TIG) welding, the introduction of a laser changes the physical characteristics of the arc plasma regardless of whether laser plasma penetration takes place, and that the influence of the laser mainly affects the near-anode region of the arc. When the laser power is relatively low, the arc column tends to compress, and the arc spectral characteristics show no significant difference. When the arc root constricts, compared with pure TIG arc, the electron density increases by ～ 2.7 ～ 3000 K
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061403 (2015)
Widely tunable, narrow linewidth Tm: YAG ceramic laser with a volume Bragg grating
Xuan Liu, Haitao Huang, Heyuan Zhu, Deyuan Shen, Jian Zhang, and Dingyuan Tang
We report on a widely tunable, narrow linewidth operation of a Tm:YAG ceramic laser. A volume Bragg grating is used in the cavity as a folding mirror for wavelength selection. The wavelength is tuned from 1956.2 to 1995 nm, leading to a total tuning range of 38.7 nm. The linewidth is around 0.1 nm over the whole tuningWe report on a widely tunable, narrow linewidth operation of a Tm:YAG ceramic laser. A volume Bragg grating is used in the cavity as a folding mirror for wavelength selection. The wavelength is tuned from 1956.2 to 1995 nm, leading to a total tuning range of 38.7 nm. The linewidth is around 0.1 nm over the whole tuning range. A maximum output power of 1.51 W at 1990.5 nm is achieved at 37.8 W absorbed pump power. Different saturation behaviors are observed in the laser performances at different wavelengths..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061404 (2015)
Integrated design of a compact magneto-optical trap for space applications
Qiuzhi Qu, Bin Wang, Desheng Lü, Jianbo Zhao, Meifeng Ye, Wei Ren, Jingfeng Xiang, and Liang Liu
In this Letter, we describe an optical assembly that is designed for the engineering application of the atomic laser cooling techniques. Using a folded optical path scheme, we have built a miniaturized, compact magneto-optical trap (CMOT) for an Rb87 atomic fountain clock. Compared with the conventional magneto-opticalIn this Letter, we describe an optical assembly that is designed for the engineering application of the atomic laser cooling techniques. Using a folded optical path scheme, we have built a miniaturized, compact magneto-optical trap (CMOT) for an Rb 87
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061405 (2015)
All-fiber 7 × 1 signal combiner with high beam quality for high-power fiber lasers
Hang Zhou, Zilun Chen, Xuanfeng Zhou, Jing Hou, and Jinbao Chen
All-fiber signal combiner is a key component for augmenting the fiber laser power. Presently the reported 7×1 signal combiners are all have output fibers with core diameters larger than 100 μm. In order to improve the beam quality of the combiner, a fiber with smaller core of 50 μm diameter is chose to be the outpAll-fiber signal combiner is a key component for augmenting the fiber laser power. Presently the reported 7 × 1 7 × 1 M 2
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061406 (2015)
Self-Q -switching in bulk Yb:KGd(WO4)2 laser
Jinghui Liu, Jinrong Tian, Zhiyuan Dou, Mengting Hu, and Yanrong Song
Self-Q-switching is observed in a bulk Yb:KGd(WO4)2 oscillator without any additional modulating elements. The output power reaches 434.4 mW at a pump power of 13.67 W, corresponding to pulse repetition rate of 125 kHz and a pulse duration of 2.5 μs, respectively. The mechanism of self-pulse formation is explained by tSelf-Q Yb : KGd ( WO 4 ) 2 Yb 3 + Yb : KGd ( WO 4 ) 2
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061407 (2015)
Fiber Optics and Optical Communications
10 Gb/s 16-quadrature amplitude modulation signal delivery over a wireless fiber system by using a directly modulated laser for electrical/optical conversion
Lun Zhao, and Jianguo Yu
We propose and experimentally demonstrate a novel scheme to realize electrical/optical (E/O) conversion on the receiver side of a wireless fiber integration system at the W band. At the receiver, a directly modulated laser (DML) is used to realize E/O conversion. The received 85 GHz wireless millimeter-wave (mm-wave) sWe propose and experimentally demonstrate a novel scheme to realize electrical/optical (E/O) conversion on the receiver side of a wireless fiber integration system at the W band. At the receiver, a directly modulated laser (DML) is used to realize E/O conversion. The received 85 GHz wireless millimeter-wave (mm-wave) signal is first down-converted into a 10 GHz electrical intermediate-frequency (IF) signal to overcome the insufficient bandwidth of the subsequent DML. Then, two cascaded electrical amplifiers (EAs) are employed to boost the electrical IF signal before it is used to drive a DML. By using this scheme, we transmit a 10 Gb/s 16 quadrature amplitude modulation (16QAM) signal over a 10 m wireless link, and then deliver it over a 2 km single-mode fiber-28 (SMF-28) wire link with a bit error ratio (BER) that is less than the hard-decision forward error correction threshold of 3.8 × 10 3
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060601 (2015)
Radiation-induced change of OH content in Yb-doped silica glass
Shuang Liu, Shupei Zheng, Ke Yang, and Danping Chen
Yb-doped silica glasses containing low, medium, and high content of OH are prepared through nanoporous glass sintering technology. High-OH sample exhibits better X-ray irradiation resistivity than low- and medium-OH samples. After irradiation, OH content of low- and medium-OH samples increases 37.5% and 11%, respectiveYb-doped silica glasses containing low, medium, and high content of OH are prepared through nanoporous glass sintering technology. High-OH sample exhibits better X-ray irradiation resistivity than low- and medium-OH samples. After irradiation, OH content of low- and medium-OH samples increases 37.5% and 11%, respectively; in contrast, OH content of high-OH sample decreases dramatically. The different OH content changes among the samples are discussed regarding the proposed inter-conversion reactions involving Si - H Si - OH
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060602 (2015)
Theoretical study of all-optical RZ-OOK to NRZ-OOK format conversion in uniform FBG for mixed line-rate DWDM systems
Oskars Ozolins, and Vjaceslavs Bobrovs
In this work we study all-optical multi-channel return-to-zero (RZ)–on-off keying (OOK) to nonreturn-to-zero (NRZ)–OOK format conversion in single uniform fiber Bragg grating (FBG) for mixed line-rate dense wavelength-division multiplexing systems using mathematical simulations. Forty and 20 Gbit/s RZ–OOK signals with In this work we study all-optical multi-channel return-to-zero (RZ)–on-off keying (OOK) to nonreturn-to-zero (NRZ)–OOK format conversion in single uniform fiber Bragg grating (FBG) for mixed line-rate dense wavelength-division multiplexing systems using mathematical simulations. Forty and 20 Gbit/s RZ–OOK signals with 33% and 50% duty cycles are converted to NRZ–OOK signals in single uniform FBG with 21% reflectivity. Impact of amplitude noise from FBG contrast profile on modulation format conversion efficiency is also studied..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060603 (2015)
Generation of ultra-flat optical frequency comb using a balanced driven dual parallel Mach–Zehnder modulator
Jian Wang, Haiwen Cai, Dijun Chen, and Ronghui Qu
We propose and experimentally demonstrate an ultra-flat optical frequency comb (OFC) generator by a balanced driven dual parallel Mach–Zehnder modulator. Five- and seven-tone OFC with exactly equal intensity can be generated theoretically. Experimentally obtained five- and seven-tone OFC with flatness of 0.6 and 1.26 dWe propose and experimentally demonstrate an ultra-flat optical frequency comb (OFC) generator by a balanced driven dual parallel Mach–Zehnder modulator. Five- and seven-tone OFC with exactly equal intensity can be generated theoretically. Experimentally obtained five- and seven-tone OFC with flatness of 0.6 and 1.26 dB are demonstrated, respectively, which agrees well with the theoretical results..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 060604 (2015)
Thin Films
Effect of the thickness of light absorption layer on the light-induced transverse thermoelectric effect in Bi2Sr2Co2Oy films
Guoying Yan, Liqing Sun, Shufang Wang, and Guangsheng Fu
Light-induced transverse thermoelectric effect is investigated in incline-oriented Bi2Sr2Co2Oy thin films covered with a graphite light absorption layer. Upon the illumination of a 980 nm cw laser, an enhanced voltage signal is detected and the improvement degree is found to be dependent on the thickness of the graphitLight-induced transverse thermoelectric effect is investigated in incline-oriented Bi 2 Sr 2 Co 2 O y
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 063101 (2015)
Nonlinear Optics
Characteristics of perfluorinated amine media for stimulated Brillouin scattering in hundreds of picoseconds pulse compression at 532 nm
Wuliji Hasi, Hang Zhao, Dianyang Lin, Weiming He, and Zhiwei Lü
The characteristics of stimulated Brillouin scattering (SBS) in perfluorinated amine media and the experimental structure used in hundreds of picoseconds pulse compression at 532 nm are demonstrated. A two-stage SBS pulse compression structure is adopted for this work. The compact double-cell SBS compression structure The characteristics of stimulated Brillouin scattering (SBS) in perfluorinated amine media and the experimental structure used in hundreds of picoseconds pulse compression at 532 nm are demonstrated. A two-stage SBS pulse compression structure is adopted for this work. The compact double-cell SBS compression structure and the scattering media FC-70 are chosen to compress the incident light from 9.5 to about 1 ns in the first stage. Then, the light is used as the pumping source for the second pulse compression. In the second stage, using a single-cell SBS structure in a pulse compression system, perfluorinated amine media with different phonon lifetimes, such as FC-3283, FC-40, FC-43, and FC-70, are chosen to run the comparative experimental study. The narrowest compressed pulse times obtained are 294, 274, 277, and 194 ps; they respectively correspond to the above listed media. The average width of the compressed pulse width is 320 ps for FC-3283, with a fluctuation range of 87 ps. For FC-40, the average pulse width is 320 ps, with a fluctuation range of 72 ps. And for FC-43, the average pulse width is 335 ps, with a fluctuation range of 88 ps. However, the average pulse width is only 280 ps for FC-70, with a fluctuation range of 57 ps. The highest energy reflectivity is more than 80% for all of the media. The experimental results show that a two-stage SBS pulse compression system has lower pump energy requirements, thus making it easier to achieve a compressed pulse waveform. The results also show that the shorter the phonon lifetime of the medium, the narrower the obtained compressed pulse width..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061901 (2015)
Optical Design and Fabrication
Morphology control of laser-induced periodic surface structure on the surface of nickel by femtosecond laser
Fantong Meng, Jie Hu, Weina Han, Penjun Liu, and Qingsong Wang
An interesting transition between low spatial frequency laser-induced periodic surface structure (LIPSS) and high spatial frequency LIPSS (HSFL) on the surface of nickel is revealed by changing the scanning speed and the laser fluence. The experimental results show the proportion of HSFL area in the overall LIPSS (i.e.An interesting transition between low spatial frequency laser-induced periodic surface structure (LIPSS) and high spatial frequency LIPSS (HSFL) on the surface of nickel is revealed by changing the scanning speed and the laser fluence. The experimental results show the proportion of HSFL area in the overall LIPSS (i.e., K ) presents a quasi-parabola function trend with the polarization orientation under a femtosecond (fs) laser single-pulse train. Moreover, an obvious fluctuation dependence of K on the pulse delay is observed under a fs laser dual-pulse train. The peak value of the fluctuation is found to be determined by the polarization orientation of the dual-pulse train..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 062201 (2015)
Image Processing
Adaptive multi-sample-based photoacoustic tomography with imaging quality optimization
Yuxin Wang, Jie Yuan, Sidan Du, Xiaojun Liu, Guan Xu, and Xueding Wang
The energy of light exposed on human skin is compulsively limited for safety reasons which affects the power of photoacoustic (PA) signal and its signal-to-noise ratio (SNR) level. Thus, the final reconstructed PA image quality is degraded. This Letter proposes an adaptive multi-sample-based approach to enhance the SNRThe energy of light exposed on human skin is compulsively limited for safety reasons which affects the power of photoacoustic (PA) signal and its signal-to-noise ratio (SNR) level. Thus, the final reconstructed PA image quality is degraded. This Letter proposes an adaptive multi-sample-based approach to enhance the SNR of PA signals and in addition, detailed information in rebuilt PA images that used to be buried in the noise can be distinguished. Both ex vivo and in vivo experiments are conducted to validate the effectiveness of our proposed method which provides its potential value in clinical trials..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061001 (2015)
Integrated Optics
Compact silicon-on-insulator-based 2 × 2 Mach–Zehnder interferometer electro-optic switch with low crosstalk
Jiejiang Xing, Zhiyong Li, Peiji Zhou, Yuanhao Gong, Yude Yu, Manqing Tan, and Jinzhong Yu
We report a compact 2×2 Mach–Zehnder interferometer (MZI) electro-optic switch fabricated on a silicon-on-insulator using standard complementary metal-oxide semiconductor (CMOS) processes. With a short modulation arm length of 200 μm, the crosstalk is reduced to 22 dB by the new modulation scheme of push–pull moduWe report a compact 2 × 2 22 dB π / 2
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 061301 (2015)
Spectroscopy
Portable infrared spectral radiance measurement apparatus based on PbSe detectors
Lei Zhang, Jingmin Dai, and Zhe Yin
A portable infrared spectral radiance measurement apparatus without the cooling based on PbSe detectors is designed to measure the spectral radiance of the object in the wavelength range from 2.1 to 4.1 μm. Cores Luxell 256 module is applied which integrates 256 pixel line array PbSe detectors, amplifiers, analog-to-diA portable infrared spectral radiance measurement apparatus without the cooling based on PbSe detectors is designed to measure the spectral radiance of the object in the wavelength range from 2.1 to 4.1 μm. Cores Luxell 256 module is applied which integrates 256 pixel line array PbSe detectors, amplifiers, analog-to-digital convertors, and Universal Serial Bus output interface. Electric aperture is applied to eliminate the effect of temperature drift. Wavelength and response function of the apparatus is calibrated with the blackbody. Results show that the wavelength resolution is 10 nm. The relative error of measured spectral radiance is below 2.3%..
Chinese Optics Letters
- Publication Date: Jun. 10, 2015
- Vol. 13, Issue 6, 063001 (2015)
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