Resonant cavity structure used for generating radially polarized laser
A resonant cavity and laser technology, which is applied in the field of laser and optics, can solve the problems of complex structure and difficult manufacture of optical components, and achieve the effect of easy realization and simple structure
Inactive Publication Date: 2015-01-28
WUHAN BOTH WIN OPTOELECTRONICS
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Problems solved by technology
For the linearly polarized laser light usually produced by lasers, a wave rotator optical element is used outside the cavity to convert the linearly polarized beam into a radially polarized beam. However, the structure of special optical elements such as the wave rotator is very complicated, and its manufacture is also very difficult.
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.
[0026] like figure 1 As shown, the axisymmetric polarization laser resonator structure of the present invention is composed of a high reflectivity tail mirror 1 with axisymmetric polarization (angular polarization or radial polarization) selection characteristics, a high reflection tail mirror 1 with a 1 / 4 wave plate phase delay characteristic It is composed of high-efficiency polarizers 2, 3, 4, 5, an output window mirror 6 with partial reflection and partial transmission characteristics, and three parallel gain regions. Among them, the three sections of gain areas are respectively the first gain area 7, the second gain area 8 and the third gain area 9, and the optical axes of their respective optical paths are respectively 10, 1...
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The invention belongs to the technical field of laser and optics, and specifically relates to a resonant cavity structure used for generating radially polarized laser. The resonant cavity structure comprises a rear mirror, a first equivalent 1 / 2 wave plate, a second equivalent 1 / 2 wave plate, a window mirror, and three gain regions. The three gain regions are connected in series by space folding through the first equivalent 1 / 2 wave plate and the second equivalent 1 / 2 wave plate to form a complete resonant cavity optical path. The rear mirror and the window mirror are respectively disposed at the head and tail ends of the resonant cavity optical path. The optical axes of the resonant cavity optical paths of the three gain regions are parallel. The included angle between the optical axis of the first equivalent 1 / 2 wave plate and the optical axis of the second equivalent 1 / 2 wave plate is 45 degrees. The initial polarization state of a light beam in the cavity is determined as angular polarization through the rear mirror, and then the multiple gain regions are connected in series by a polarizer, thereby obtaining the output of radially polarized laser directly. The resonant cavity has no external conversion optical device, and is simple in structure and easy to realize.
Description
technical field [0001] The invention belongs to the technical field of laser and optics, and in particular relates to a resonant cavity structure for generating radially polarized laser light. Background technique [0002] Recently, with the development of technologies such as holography, coherence, spectroscopy, photochemistry, and accelerators, there is an increasing demand for some special axisymmetrically polarized lasers such as radially polarized lasers. In addition, in laser processing, especially in laser cutting, in order to ensure the uniformity of processing quality of linearly polarized (S-polarized or P-polarized) lasers in different processing directions, it is usually necessary to convert the linearly polarized laser into Circularly polarized laser is used for processing, but this method is relatively complicated. Therefore, it is the pursuit of the laser processing industry to seek a laser source that has no direction selectivity and has a higher material abs...
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IPC IPC(8): H01S3/08H01S3/081
Inventor 王又青李波杨扬赵江贺昌玉
Owner WUHAN BOTH WIN OPTOELECTRONICS