"Optical frequency comb with an absolute linewidth of 1 Hz," by Long-Sheng Ma (East China Normal University)

Monday, June 3, 2013 - 9:30am to 10:30am
AMO Seminars


AMO Seminar

Monday, June 3
Physics & Astronomy Building (PAB) Room 4-330

Guest Speaker: Long-Sheng Ma (State Key Laboratory of Precision Spectroscopy, East China Normal University)

Talk Title: "Optical frequency comb with an absolute linewidth of 1 Hz"


Narrow-linewidth lasers with ultra-low phase noise and spectral purity are widely used in precision measurement and metrology. By phase-locking an optical frequency comb to a subhertz-linewidth reference laser, each comb line inherits the phase coherence and frequency stability of the reference laser. Using the techniques of collinear self-referencing and cross-phase modulation, a Ti:Sapphire femtosecond laser frequency comb with a repetition rate of 800 MHz is phase-locked to a sub-hertz linewidth Nd:YAG laser at 1064 nm. By comparing against a second similar Nd:YAG laser, the absolute linewidths of optical frequency comb teeth have been measured at 0.6~1.2 Hz over an octave spectrum. 

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