A wavelength-tunable sum-frequency laser in yellow, orange, and red bands

Abstract

The present disclosure relates to a wavelength-tunable sum-frequency laser in the yellow, orange, and red bands, which includes a s-polarized signal light single-resonant optical parametric oscillator based on a periodically polarized crystal MgO:PPLN and an LD side-pumped Nd:GdVO4 The p-polarized fundamental frequency optical resonator of the crystal forms a composite folded resonator, and uses the type II angle matching sum frequency crystal KTP to perform sum frequency to generate yellow, orange and red lasers. The wavelength of the s-polarized signal light participating in the sum frequency can be tuned, and the wavelength of the p-polarized fundamental frequency light can be changed. They oscillate independently in their respective resonators, avoiding the pump laser of the single-resonant optical parametric oscillator due to participating in the sum-frequency process. The resulting power loss; because the spot size of the s-polarized signal light and the p-polarized fundamental frequency light is basically the same, the astigmatism problem of the folded resonator is solved; the changeable wavelength of the fundamental frequency light further broadens the wavelength of the sum frequency light The adjustable range overcomes the shortcomings of the prior art.

Description

technical field [0001] The disclosure relates to a laser, in particular to a wavelength-tunable sum-frequency laser in yellow, orange, and red bands. Background technique [0002] 550nm-700nm yellow, orange and red band lasers are widely used in biomedicine, laser measurement, laser display, laser printing, pollution monitoring, satellite guidance, underwater detection, spectral analysis and other fields. The early yellow, orange, and red band lasers were mostly copper vapor and dye lasers, which were large in size and contained highly toxic substances, which limited their practical applications. With the development of semiconductor laser technology, semiconductor laser pumping Nd-doped 3+ Crystal cavity sum frequency technology, Raman frequency shift technology, blue laser pumping doped Pb 3+ Crystal all-solid-state laser technology and semiconductor laser intracavity frequency doubling technology to obtain yellow, orange, and red band lasers have become research hotspot...

AI Technical Summary

Problems solved by technology

However, in the prior art, the pumping laser of the optical parametric oscillator plays two roles of pumping the optical parametric oscillator and participating in the intracavity sum-frequency process, which disperses the pump power and reduces the intracavity signal optical power density. , wavelength tunable yellow, orange, red band laser output power is low, wavelength tuning range is limited

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