Device for generating optical comb based on optimized cascade difference frequency

Abstract

The invention provides a device for generating an optical comb based on optimized difference frequency. First pump light emitted from a first pump source enters a beam combiner; second pump light emitted from a second pump source enters the beam combiner through a phase delay system; the first pump light and the second pump light are mixed into frequency-mixed light in the beam combiner; the frequency-mixed light passes through a telescope system and then enters an APPLN crystal; the frequency-mixed light generates cascaded light in the APPLN crystal under the action of cascaded optical difference frequency; and the cascaded light enters a GaP waveguide and generates the optical comb through the effect of optimizing cascade optical difference frequency. By arranging the APPLN crystal, the cascaded light is transferred to a Stokes region, and the frequency range of the generated optical comb is wide. By enhancing the Stokes cascade difference frequency and inhibiting the anti-Stokes cascade difference frequency at the same time, the optical conversion efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of optical frequency comb applications, and in particular relates to a device for generating an optical comb based on optimized cascaded difference frequencies. Background technique [0002] An optical comb is an optical frequency comb, which is a laser light source. In the time domain, it appears as an ultrashort pulse sequence with equal intervals and equal amplitudes. In the frequency domain, it appears as regular and equally spaced comb lines. The spacing is exactly equal to the repetition rate of the laser pulses. Optical frequency combs provide high-precision, high-accuracy, and high-sensitivity tools for precision measurement of optical frequencies, greatly promoting research in the fields of attosecond science, optical clocks, astronomical observations, precision measurements, quantum manipulation, and life sciences. [0003] The optical frequency comb is an ultra-high-precision ruler that provides ...

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Problems solved by technology

[0004] The lack of an optical frequency comb source that can generate high power, high quality, high efficiency, low cost and can operate at room temperature is the main problem at present. The early optical combs are based on Ti:Sapphire femtosecond lasers. Shortly after the realization of the Ti:Sapphire optical comb, the rapid development of all-solid-state lasers further extended the frequency band of the optical comb to the mid-infrared and even far-infrared bands. Water cooling, harsh operating conditions and high cost make it difficult to meet or adapt to the needs of application scenarios. At present, it is difficult to meet the demands of simple operation and long-term continuous measurement in the field of optical frequency measurement. The advantage of this method is that the device of the optical frequency comb generated is simple. However, the power and efficiency of optical frequency combs produced at this stage are low

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