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[IEEE 2019 Joint Conference of the IEEE International Frequency Control Symposium anEuropean Frequency and Time Forum (EFTF/IFC) - Orlando, FL, USA (2019.4.14-2019.4.18)] 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC) - Development of Ultra-stable Clock Laser System for Space Applications
摘要： The National Time Service Centre of China is developing a 698 nm ultra-stable clock laser system for dedicated use in a space strontium optical clock. This report present the development of this system. The laser reaches a frequency instability of 3.5×10?15 at 1 s averaging time and the linewidth is about 1.3 Hz.
关键词： Laser stabilization,Ultra-stable laser,Fabry-Perot
更新于2025-09-19 17:13:59
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Development of an Interference Filter-Stabilized External-Cavity Diode Laser for Space Applications
摘要： The National Time Service Center of China is developing a compact, highly stable, 698 nm external-cavity diode laser (ECDL) for dedicated use in a space strontium optical clock. This article presents the optical design, structural design, and preliminary performance of this ECDL. The ECDL uses a narrow-bandwidth interference ?lter for spectral selection and a cat’s-eye re?ector for light feedback. To ensure long-term stable laser operation suitable for space applications, the connections among all the components are rigid and the design avoids any spring-loaded adjustment. The frequency of the ?rst lateral rocking eigenmode is 2316 Hz. The ECDL operates near 698.45 nm, and it has a current-controlled tuning range over 40 GHz and a PZT-controlled tuning range of 3 GHz. The linewidth measured by the heterodyne beating between the ECDL and an ultra-stable laser with 1 Hz linewidth is about 180 kHz. At present, the ECDL has been applied to the principle prototype of the space ultra-stable laser system.
关键词： laser diode,interference ?lter,space optical clock,external-cavity diode laser,laser stabilization
更新于2025-09-16 10:30:52
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Improving weld bead homogeneity in short arc GMAW processes applying low power diode lasers
摘要： Using laser and arc power in equal parts, laser-arc hybrid welding processes are successfully adapted by the industry. This paper shows the stabilizing effects of diode lasers on short arc GMAW (gas metal arc welding) which deliver just a fraction of the supplied arc power. In a comprehensive comparison the stabilized and the sole GMAW processes are confronted and differences regarding process behavior and weld bead properties are pointed out. The tests were carried out with DC01 (1.0330) plates of 1 mm thickness deploying lasers using a mean laser intensity of 1,1 x104 W/cm2. Adding this low amount of intensity provides stability to the weld process and results in weld beads of higher homogeneity. The process behavior is characterized by the transient current and voltage curves which are analyzed in regards to consistency and uniformity. Metallographic analysis is employed to compare the weld bead dimensions at different energy ratios.
关键词： low energy,arc,laser stabilization,diode laser
更新于2025-09-12 10:27:22
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Modulation transfer spectroscopy based on acousto-optic modulator with zero frequency shift
摘要： We present a modulation transfer spectroscopy (MTS) configuration based on an acousto-optic modulator by using a variant of the typical double pass structure. One beam is modulated by using an acousto-optic modulator in opposite diffraction order to cancel the carrier frequency shift and produce a modulated pump beam. The line shape performance is investigated theoretically and experimentally. Laser frequency stabilization of the proposed configuration is demonstrated for the 133Cs |62S1/2, F = 4? → |62P3/2, F ′ = 5? transition. The Allan deviations, which are measured by using beat note signals and the three-cornered hat method, are 3.6×10?11 in an integration time of 100 s and approximately 4×10?11 in a longer integration time.
关键词： laser stabilization,modulation transfer spectroscopy
更新于2025-09-09 09:28:46