Author Affiliations
Abstract
1 Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
2 School of Instrument Science and Technology, Hefei University of Technology, Hefei 230009, China
3 School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510643, China
4 Science and Technology on Optical Radiation Laboratory, Beijing 100039, China
In this Letter, we demonstrate high-quality (Q), millimeter-size, and V-shaped calcium fluoride crystalline resonators for modal modification. To manufacture such resonators, we develop a home-made machining system and explore a detailed process. With a dedicated polished container, three special polishing steps, including grinding, smoothing, and polishing, are employed to achieve the required surface smoothness, which is characterized by less than 3 nm. An ultra-high-Q factor exceeding 108 is obtained by a coupled tapered fiber. In addition, a customized packaged structure for our disk resonator is achieved. The Q maintenance and stable spectrum are realized by sealing the coupling system in a hard disk. The simple, stable, portable, controlled, and integratable device would provide great potential in optical filters, sensors, nonlinear optics, cavity quantum electrodynamics, and especially some applications that require large resonators such as gyroscopes.
140.3410 Laser resonators 350.3950 Micro-optics 210.4590 Optical disks 220.5450 Polishing Chinese Optics Letters
2019, 17(11): 111401
College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
Frontiers of Optoelectronics
2014, 7(4): 425–436
Author Affiliations
Abstract
Optical Memory National Engineering Research Center, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, ChinaE-mail: ymm@mails.tsinghua.edu.cn
To improve the tracking servo performance, a novel signal waveform multi-level (SWML) read-only disc realized on the digital versatile disc (DVD) platform is presented. The characteristic of the differential phase detection (DPD) signal of the SWML read-only disc is analyzed both in theory and experiment. The amplitude of the DPD signal of the SWML read-only disc in an open tracking servo loop is about 2/3 of that of the DVD read-only disc. The uniformity and symmetry of the DPD signal of the SWML read-only disc are similar to those of the DVD read-only disc and better than the former multi-level run-length limited (ML-RLL) read-only disc.
多阶 游程长度受限 信号波形 差分相位检测 循迹伺服 210.0210 Optical data storage 210.4590 Optical disks 210.4680 Optical memories Chinese Optics Letters
2009, 7(5): 05424
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
The effect of an apodizer with two parallel taper refractive surfaces is theoretically investigated for high-density optical storage. The apodizer may modulate an incident Gaussian beam into an annular beam. Simulation shows that with the increasing inner radius of the modulated beam, the focal spot shrinks obviously. The depolarization effect gets strong simultaneously, which induces the circular symmetry loss of the focal spot. In this process, pattern density of the orthogonal and longitudinal diffractive fields increases remarkably.
210.4590 optical disks 210.4680 optical memories 050.1970 diffractive optics 260.5430 polarization Chinese Optics Letters
2005, 3(6): 06361
Author Affiliations
Abstract
1 School of Electronics Information, Wuhan University, Wuhan 430072
2 Data Storage Institute, Singapore, DSI Building, 5 Engineering Drive 1, Singapore 117608
3 1School of Electronics Information, Wuhan University, Wuhan 430072
4 2Data Storage Institute, Singapore, DSI Building, 5 Engineering Drive 1, Singapore 117608
A superlattice-like (SLL) structure was applied to phase-change optical recording. The recording layer consisting of alternating thin layers of two different phase-change materials, GeTe and Sb2Te3, were grown by magnetron sputtering on polycarbonate substrates. Land/groove optical recording was adopted to suppress crosstalk and obtain a large track density. Dynamic properties of the SLL disc were investigated with the shortest 1T pulse duration of 8 ns. Clear eye pattern was observed after 10000 direct overwrite cycles. Erasability above 20 dB was achieved at a constant linear velocity of 19 m/s. Carrier-noise ratio (CNR) kept above 46 dB when the recording frequency reaches 21 MHz. The SLL phase change optical disc demonstrates a better recording performance than the Ge1Sb2Te4 and Ge1Sb4Te7 discs in terms of CNR, erasability, and overwrite jitter.
210.0210 optical data storage 210.4590 optical disks 210.4770 optical recording 160.4670 optical materials Chinese Optics Letters
2004, 2(6): 06356
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2 East China Normal University, Shanghai 200062
Using Ti as the super-resolution reflective film to replace the Al reflective layer in conventional read-only optical disk, the recording marks with a diameter of 380 nm and a depth of 50 nm are read out in a dynamic testing device whose laser wavelength is 632.8 nm and numerical aperture of the lens is 0.40. The optimum Ti thin film thickness is 18 nm and the corresponding signal-noise-ratio is 32 dB.
210.4590 optical disks 210.4680 optical memories 160.4330 nonlinear optical materials 190.4720 optical nonlinearities of condensed matter Chinese Optics Letters
2003, 1(7): 07420
Author Affiliations
Abstract
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
In this paper, the spin-coated thin films of phthalocyanine dye are presented. Absorption spectrum of the thin film shows a comparatively broad absorption in the wavelength range 630-770 nm. Optical parameters of the thin film were measured by a spectroscopic ellipsometer system. 5-in CD-R discs made of this dye exhibit good performance with Yamaha 20-speed recorder. Jitters of land and pit are less than 30 ns, and the 3T-11T's signals show very good quality. This dye is a promising recording medium for CD-R with much higher recording speed.
160.4890 organic materials 210.4810 optical storage-recording materials 210.4590 optical disks Chinese Optics Letters
2003, 1(2): 02102
从磁光读出和热磁写入两者结合的角度提出一个新的优化目标函数.并用其完成了Bi代DyGaIG/金属反射层/玻璃多层结构磁光盘的优化设计。结果表明新优化目标函数更具实际意义。
磁光盘 Bi代石榴石 薄膜 优化设计
