Polarization continuously adjustable cylindrical vector optical solid-state laser

Abstract

The invention discloses a polarization continuously adjustable cylindrical vector optical solid-state laser. The laser comprises a laser diode, an optical fiber coupling unit, a film-coating cavity mirror, a gain medium, a polarized element, a vortex half wave plate and a pin hole; the film-coating cavity mirror comprises a film-coating front cavity mirror, a film-coating focusing lens and a film-coating back cavity mirror which form a resonant cavity; the polarization state orientation in different positions in the space is controlled by using a polarization beam splitter, a 1 / 2 wave plate and the vortex half wave plate in the cavity; and cylindrical vector beams in different polarization state distribution are output. By virtue of the laser, the intra-cavity loss is lower, the active mode is higher in flexibility, and the output cylindrical vector beams are higher in quality.

Description

technical field [0001] The invention relates to a continuous light solid laser, in particular to a cylindrically symmetric vector light solid laser with continuously adjustable polarization. Background technique [0002] Polarization is one of the important properties of light. Its vectorial properties and its interaction with matter make it possible to design some optical devices and optical systems. The propagation of polarized light and the interaction with matter have been widely used in optical detection, optical measurement, display technology, data storage, optical communication, material science, astronomy, biological research and other fields. However, the polarization states of light utilized by these applications are uniformly distributed in space, such as linear polarization state, elliptical polarization state, circular polarization state, etc. All these polarization states are independent of the positional coordinates on the beam cross-section. In recent year...

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Problems solved by technology

Such devices include calcite and conical mirrors, but this method generally only produces CV beams with l=1 【4,5】 ; (2) Using a special process, the coupling output mirror is processed to have diffraction or polarization selective characteristics to generate CV beams. This method makes the laser more integrated, but the design and processing are difficult 【6】 ; (3) Using the method of intracavity interference, two linearly polarized Hermegaussian lights whose polarization directions are perpendicular to each other are superimposed on each other to generate a CV beam, but this method can only generate a CV beam with l=1 【7】

The above active methods all need to suppress the oscillation of the Gaussian mode in the cavity, such as using the pump light with annular light intensity distribution, adding a circular absorbing element in the cavity, etc., and the need to meet the mode matching in the cavity, so that the active method is lacking. flexibility

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