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Compact And Portable Frequency-stabilized Laser System

Posted on:2017-09-30Degree:MasterType:Thesis
Country:ChinaCandidate:W QiFull Text:PDF
GTID:2348330512456403Subject:Optics
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In recent years, frequency-stabilized laser systems have been widely used in many fields, such as optical atomic clock, precision spectroscopy, geodesy, space based test of general relativity, fundamental physics and generation of ultra-stable microwaves. In many of the applications, the frequency-stabilized lasers are operated in a non-laboratory environment, or even sent to the space station.To meet those applications, in this thesis we design and develop a compact, portable frequency-stabilized laser system. Firstly we give a brief introduction to the Pound-Derever-Hall ?PDH? technique, by which a laser frequency is stabilized to the resonance of an ultra-stable optical cavity. The noises in the PDH technique and the ways to reduce those noises are introduced. Based on finite element analysis ?FEA?, we design a portable optical reference cavity with low sensitivity to environmental vibration and temperature fluctuation (the designed vibration and temperature sensitivities are 1.2×10-11/ms-2 and 2.4×10-9/K accordingly). Besides, we also take the light power fluctuation-induced cavity length instability into consideration. The cavity is designed to have a light-intensity-fluctuation-induced fractional length instability of 1×10-15 when the 10 ?W light with a fluctuation of 1×10-4 ?at 1 s? is incident onto the cavity. The thermal noise limited cavity length instability is 1.2×10-15.Experimentally, the designed optical reference cavity is fabricated. It is well protected from environmental perturbations by being vacuumed and temperature-controlled. A laser frequency is stabilized to the resonance of the optical reference cavity by using the PDH technique. By beating against a narrow-linewidth optical frequency comb referenced to another cavity-stabilized laser at 1064 nm with a frequency instability of 1×10-15 and a linewidth of 0.6 Hz, the laser system is measured to have a linewidth of 73 kHz, and a fractional frequency instability of 5×10-13 at 1 s averaging time.
Keywords/Search Tags:Ultrastable laser system, Pound-Drever-Hall technique, Optical reference cavity, Compact and portable
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