A device and method for laser micro frequency shift based on cylindrical vector light field
A frequency offset and column vector technology, applied in the optical field, can solve problems such as poor performance, low output power, and excessive tunability, and achieve the effects of strong versatility, strong stability, and small overall size
Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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Problems solved by technology
In high-precision applications, the tunable frequency and output power of acousto-optic modulation and electro-optic modulation are difficult to meet the needs, and the side effects of broadening attached to the adjustment method have gradually become one of the main parameters for evaluating the tuning method
The tuning method with obvious spectrum broadening effect, too large tunable amount, and too small output power does not perform well in many fine-tuning scenarios
Method used
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[0044] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0045] The work flow of the optical instrument of the present invention is divided into three processes: generating cylindrical vector vortex light, selectively rotating polarization, and reducing to fundamental mode Gaussian light. Performed in a polarization framework with different polarization components of cylindrical vector vortex light. implemented as figure 1 As shown, it includes a conjugated helical phase polarizing polarizer 1 , a polarization-selective chirality invertor 2 and a non-polarizing helical phase plate 3 . The collinear conjugated helical phase polarizing polarizer 1, the polarization selective chirality invertor 2 and the non-polarizing helical phase plate 3 are all cylinders, and the collinear conjugated helical phase polarizing polarizer 1, polarizing The selective chirality invertor 2 and the unpolarized helical phase plate 3 are arranged ...
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The invention discloses a laser micro-frequency shift device and method based on a cylindrical vector light field. The rotator and the non-polarized helical phase plate are arranged in a gap or fit; the polarization selective chirality invertor includes a first liquid crystal retardation plate, an anisotropic crystal and a second liquid crystal retardation plate connected in sequence along the light propagation direction; The fast axes of the first liquid crystal retardation plate and the second liquid crystal retardation plate are uniformly arranged, and form an included angle and an included angle with the x-axis respectively. The x-axis is perpendicular to the light propagation direction and is located on the horizontal plane, and the anisotropic crystal propagates along the light. The length d of the direction is h, which is the height of the anisotropic crystal perpendicular to the direction of light propagation. A tiny frequency offset device that realizes the function of frequency slight offset.
Description
technical field [0001] The invention belongs to the field of optics, and relates to a laser micro frequency shift device and method based on a cylindrical vector light field. Background technique [0002] Laser has excellent monochromaticity and coherence, and is a common light source in the fields of optical detection and optical processing. Frequency is a basic parameter when laser is abstracted as a physical model, and is indispensable in laser-related theoretical calculations. The precise frequency can often greatly improve the calculation accuracy in various application scenarios and theories, so the precise adjustment and measurement of the frequency has always been a key issue in the field of optics that needs to be improved. [0003] The adjustment methods of laser frequency are generally divided into two categories: intra-cavity and extra-cavity. Intracavity adjustment is to adjust the parameters of the resonator in various ways, so that the unwanted wavelength lo...
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IPC IPC(8): G02B26/00G02B27/28
CPCG02B26/002G02B27/286
Inventor 贾俊亮张沛赵子丹王晨辉
Owner XI AN JIAOTONG UNIV