scholarly journals Reference-free, high-resolution measurement method of timing jitter spectra of optical frequency combs

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Dohyeon Kwon ◽  
Chan-Gi Jeon ◽  
Junho Shin ◽  
Myoung-Sun Heo ◽  
Sang Eon Park ◽  
...  
Keyword(s):  
High Resolution ◽  
Measurement Method ◽  
Timing Jitter ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
High Resolution Measurement ◽  
Resolution Measurement

Development of a Non-Contact Precision Measurement Technique Using Optical Frequency Combs

2012 ◽  
Vol 523-524 ◽  
pp. 877-882 ◽  
Author(s):  
Taro Onoe ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu ◽  
Hirokazu Matsumoto
Keyword(s):  
High Resolution ◽  
Frequency Comb ◽  
High Sensitivity ◽  
Distance Measurement ◽  
New Method ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
High Frequencies ◽  
Frequency Combs ◽  
Lock In

We develop a new method for high-resolution and contactless distance measurement based on self frequency beats of optical frequency combs. We use two optical frequency comb lasers with Rb-stabilized repetition frequencies for doing accurate distance measurement. The repetition frequencies of the optical frequency combs are different, thus parts of the high frequencies such as several gigahertz of self beats are beat-downed to several megahertz without an RF frequency oscillator. The phases of the beat signals of several megahertz frequencies are measured by a lock-in amplifier with a high resolution and high sensitivity. The new method is applied to distance measurement for objects which have rough-surface in the distance range of several-meters.

scholarly journals Generation of multiple ultrastable optical frequency combs from an all-fiber photonic platform

2020 ◽  
Vol 6 (13) ◽  
pp. eaax4457
Author(s):  
Dohyeon Kwon ◽  
Igju Jeon ◽  
Won-Kyu Lee ◽  
Myoung-Sun Heo ◽  
Jungwon Kim
Keyword(s):  
Repetition Rate ◽  
Low Cost ◽  
Frequency Instability ◽  
Timing Jitter ◽  
Optical Frequency ◽  
Narrow Linewidth ◽  
Stabilization Method ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Alignment Free

Frequency-stabilized optical frequency combs have created many high-precision applications. Accurate timing, ultralow phase noise, and narrow linewidth are prerequisites for achieving the ultimate performance of comb-based systems. Ultrastable cavity-based comb-noise stabilization methods have enabled sub–10−15-level frequency instability. However, these methods are complex and alignment sensitive, and their use has been mostly confined to advanced metrology laboratories. Here, we have established a simple, compact, alignment-free, and potentially low-cost all-fiber photonics-based stabilization method for generating multiple ultrastable combs. The achieved performance includes 1-femtosecond timing jitter, few times 10−15-level frequency instability, and <5-hertz linewidth, rivalling those of cavity-stabilized combs. This method features flexibility in configuration: As a representative example, two combs were stabilized with 180-hertz repetition rate difference and ~1-hertz relative linewidth and could be used as an ultrastable, octave-spanning dual-comb spectroscopy source. The demonstrated method constitutes a mechanically robust and reconfigurable tool for generating multiple ultrastable combs suitable for field applications.

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