scholarly journals A wide-range optical frequency generator based on the frequency comb of a femtosecond laser

2008 ◽  
Vol 16 (1) ◽  
pp. 258 ◽  
Author(s):  
Young-Jin Kim ◽  
Jonghan Jin ◽  
Yunseok Kim ◽  
Sangwon Hyun ◽  
Seung-Woo Kim
Keyword(s):  
Femtosecond Laser ◽  
Frequency Comb ◽  
Optical Frequency ◽  
Wide Range ◽  
Frequency Generator

scholarly journals Spectral Broadening in a Continuously Pumped Singly Resonant Second-Harmonic Cavity

2021 ◽  
Vol 11 (15) ◽  
pp. 7122
Author(s):  
Simona Mosca ◽  
Tobias Hansson ◽  
Maria Parisi
Keyword(s):  
Continuous Wave ◽  
Frequency Comb ◽  
Second Harmonic ◽  
Input Power ◽  
Second Order ◽  
Optical Frequency ◽  
Frequency Combs ◽  
Research Areas ◽  
Mixed Regime ◽  
Wide Range

Optical frequency comb synthesizers with a wide spectral range are an essential tool for many research areas such as spectroscopy, precision metrology, optical communication, and sensing. Recent studies have demonstrated the direct generation of frequency combs, via second-order processes, that are centered on two different spectral regions separated by an octave. Here, we present the capability of optical quadratic frequency combs for broad-bandwidth spectral emission in unexplored regimes. We consider comb formation under phase-matched conditions in a continuous-wave pumped singly resonant second-harmonic cavity, with large intracavity power and control of the detuning over several cavity line widths. The spectral analysis reveals quite distinctive sidebands that arise far away from the pump, singularly or in a mixed regime together with narrowband frequency combs. Notably, by increasing the input power, the optical frequency lines evolve into widely spaced frequency clusters, and at maximum power, they appear in a wavelength range spanning up to 100 nm. The obtained results demonstrate the power of second-order nonlinearities for direct comb production within a wide range of pump wavelengths.

An hybrid er:fiber femtosecond Laser for optical frequency comb applications

2018 ◽  
Author(s):  
Yanyan Zhang ◽  
Lulu Yan ◽  
Pan Zhang ◽  
Bingjie Rao ◽  
Shougang Zhang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Optical Frequency

scholarly journals Optical Angle Sensor Technology Based on the Optical Frequency Comb Laser

2020 ◽  
Vol 10 (11) ◽  
pp. 4047 ◽  
Author(s):  
Yuki Shimizu ◽  
Hiraku Matsukuma ◽  
Wei Gao
Keyword(s):  
Femtosecond Laser ◽  
Frequency Comb ◽  
Angle Measurement ◽  
Optical Frequency Comb ◽  
High Peak Power ◽  
Optical Frequency ◽  
Absolute Distance ◽  
Angle Sensor ◽  
The Absolute ◽  
Optical Angle Sensor

A mode-locked femtosecond laser, which is often referred to as the optical frequency comb, has increasing applications in various industrial fields, including production engineering, in the last two decades. Many efforts have been made so far to apply the mode-locked femtosecond laser to the absolute distance measurement. In recent years, a mode-locked femtosecond laser has increasing application in angle measurement, where the unique characteristics of the mode-locked femtosecond laser such as the stable optical frequencies, equally-spaced modes in frequency domain, and the ultra-short pulse trains with a high peak power are utilized to achieve precision and stable angle measurement. In this review article, some of the optical angle sensor techniques based on the mode-locked femtosecond laser are introduced. First, the angle scale comb, which can be generated by combining the dispersive characteristic of a scale grating and the discretized modes in a mode-locked femtosecond laser, is introduced. Some of the mode-locked femtosecond laser autocollimators, which have been realized by combining the concept of the angle scale comb with the laser autocollimation, are also explained. Angle measurement techniques based on the absolute distance measurements, lateral chromatic aberration, and second harmonic generation (SHG) are also introduced.

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