High stability, large frequency interval, adjustable frequency interval optical frequency comb

Abstract

The invention discloses a novel method for obtaining a high-stability high-frequency-space optical frequency comb with an adjustable frequency space. The method is characterized in that selection of the frequency space can be determined according to requirements, selection of the modulation depth is based on signal-to-noise ratio analysis, and effects of noise on the optical frequency comb stability are restrained by selecting the appropriate modulation depth. The optical frequency comb has the advantage that the stability is good, frequency space is large, and the frequency space can be adjusted randomly from several GHz to several THz.

Description

technical field [0001] The invention relates to the production of high stability, large frequency interval and adjustable frequency interval optical frequency comb. Background technique [0002] Optical frequency combs have extremely important application value in high-tech research fields such as studying the relationship between matter and antimatter, identifying molecular components, high-speed optical communication, and ultra-precision spectroscopy. In 2005, John L. Hall and Theodor W. Nobel Prize in Physics for his contributions to the development of laser-based ultra-precise spectroscopy measurements and the perfecting of optical frequency comb technology. Recently, some media have reported that German scientists have successfully applied this technology to astronomical telescopes to accurately measure the expansion speed of the universe. All these show that the optical frequency comb has great application value. Obtaining a light source with high stability, large ...

AI Technical Summary

Problems solved by technology

For mode-locking technology, the frequency interval of the obtained optical frequency comb is usually on the order of megahertz, and the frequency interval is not adjustable when the cavity length is fixed; although the high-frequency phase modulator in the cavity can obtain an optical frequency with adjustable frequency interval comb, but high-frequency phase modulators, especially phase modulators greater than 100 GHz, are quite expensive and difficult to obtain, so it is difficult to obtain an optical frequency comb with a large frequency interval; the modulation is introduced outside the cavity to inject the modulated continuous light into the optical fiber to There are two main methods to obtain an optical frequency comb: one method is to use a high-frequency intensity modulator to modulate the continuous wave and then inject the modulated continuous wave into the optical fiber. This method also faces the disadvantage that the high-frequency modulator is difficult to obtain. Moreover, the influence of noise on the stability of the generated optical frequency comb has a great relationship with the selection of modulation frequency and modulation depth; another method uses light with two adjacent frequencies to beat the frequency to generate modulated continuous light and then injects it into the optical fiber. The frequency interval of the optical frequency comb obtained by the method is large, but the stability of the optical frequency comb is also affected by the modulation frequency and modulation depth

These disadvantages limit the application of these technologies

Images