3 results about "Fourth harmonic" patented technology

This invention discloses a dual-frequency deep ultraviolet laser generator, comprising a fundamental frequency seed source, a first harmonic conversion optical path, a second harmonic conversion optical path, and an output optical path. The first harmonic conversion optical path has a first beam combiner, a first second harmonic module, a third harmonic module, and a first delay line arranged sequentially along the propagation direction of the light. The second harmonic conversion optical path has a second beam combiner, a harmonic conversion optical path branch, and a second delay line. The harmonic conversion optical path branch and the second delay line are connected in parallel between the second beam combiner and the output optical path. The harmonic conversion optical path branch has a second second harmonic module and a fourth harmonic module arranged sequentially after the second beam combiner along the propagation direction of the light. The output optical path has a seventh harmonic module and an eighth harmonic module. This invention avoids the single-path power bottleneck by using distributed amplification, breaking through the power limitation of the fundamental frequency in traditional sum-frequency generation methods.

This invention belongs to the field of microelectronics technology and discloses a high-precision eight-phase voltage-controlled oscillator based on a transformer superharmonic coupling network. The oscillator includes four voltage-controlled oscillator units and a superharmonic coupling network, with each unit outputting a pair of differential oscillation signals. The superharmonic coupling network consists of two stage I coupling transformers and one stage II coupling transformer. The stage I coupling transformers are connected to the second harmonic output terminals of the first and second groups of voltage-controlled oscillator units, respectively, creating a 90° phase difference between the corresponding fundamental signals. The stage II coupling transformer is connected to the fourth harmonic coupling terminal of the stage I coupling transformer, creating a 90° phase difference between the second harmonic signals of the four units, thus ensuring that the eight fundamental output signals are sequentially 45° out of phase. This invention achieves high-precision eight-phase output by precisely controlling the fourth harmonic phase to regulate the second harmonic phase of each unit, while not interfering with the fundamental oscillation. It has advantages such as symmetrical structure, small phase error, and consistent output amplitude.