AbstractThe influence of the relative phase between the fundamental frequency and harmonics of a folded cavity intracavity frequency-doubled laser on the output power of the frequency-doubled light is theoretically analyzed. In an experiment, a fully solid-state LD-pumped Nd:YVO4+KTP folded cavity intracavity frequency-doubled laser is used. The dispersion effect of the optical wedge is used to adjust the relative phase between the fundamental frequency and harmonics in the cavity. It is found that the frequency-doubled light output varies with the relative phase between the fundamental frequency and harmonics in a cosine square function. This verifies the theoretical results and provides a simple and practical method for eliminating the influence of the relative phase in high-power lasers and improving the output power. Keywords intracavity frequency doubling; folded cavity; relative phase between fundamental frequency and harmonics
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