A monolithic crystal cavity blue light frequency doubler

Abstract

The invention relates to the design, construction, temperature control and frequency conversion technology of a blue light laser frequency doubling device, in particular to a blue light frequency doubler with a monolithic crystal cavity. The invention can solve the demand for blue light laser in optoelectronic engineering technology, optical information and optical frontier scientific research, and effectively overcome the large cavity loss and unstable cavity length in the current separated or semi-separated frequency doubling cavity, which affects the output results and The existing frequency multiplier temperature control device has defects such as time delay and temperature instability. Through the whole block crystal cavity frequency doubler of the present invention, stable continuous frequency doubled blue light output can be obtained. The design of the balanced temperature control structure in the present invention is beneficial to maintain a constant temperature of the crystal cavity, and can accurately realize phase matching and cavity resonance at the same time. The invention can be widely used in nonlinear frequency conversion process.

Description

technical field [0001] The invention relates to the design, construction, temperature control and frequency conversion technology of a blue light laser frequency doubling device, in particular to a blue light frequency doubler with a monolithic crystal cavity. Background technique [0002] Blue short-wavelength lasers have broad application prospects in submarine optical communications, ocean exploration, optical disc reading and writing, optical information processing, laser printing, and laser medical treatment. In addition, they can also be used to capture and damp thermal vibrations of cesium atoms to achieve laser cold. However, in the development of semiconductor lasers in recent decades, their output wavelengths are mainly in the near-infrared or mid-to-far infrared bands, and there are still some constraints in terms of operating life, output power, and beam quality in terms of short wavelengths. The use of nonlinear crystal frequency doubling is an important means ...

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Problems solved by technology

At present, at home and abroad, the separated or semi-separated cavity structure is usually used to perform the frequency doubling process to obtain the frequency doubling blue light output (document E.S.Polzik and H.J.Kimble, "Frequency doubling with KNbO 3 in an external cavity,"Opt.Lett.16(18),1400–1402(1991)), including: ring cavity and semi-integral cavity, this type of cavity structure is easy to adjust, but because of the separation element, the inner cavity loss is large and stable The disadvantage of poor performance requires an external auxiliary locking system to maintain long-term operation, which is easily disturbed by the outside world, and it is difficult to ensure long-term operation

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