Tunable single-frequency Raman laser
一种拉曼激光、激光器的技术，应用在激光器领域，能够解决稳定性与可靠性差、输出激光不具备大范围可调谐、拉曼转换效率低等问题，达到高自由度的效果
Inactive Publication Date: 2021-08-06
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0005] In the prior art, single-frequency Raman lasers are realized by cascading fundamental-frequency resonators combined with Raman resonators; The fundamental frequency light output reduces the power density of the fundamental frequency light in the cavity, resulting in a low Raman conversion efficiency
Alternatively, by placing the fundamental-frequency optical gain and Raman gain in the same resonant cavity, and injecting fundamental-frequency optical seeds to control the longitudinal mode mode and narrow the linewidth, a narrow-linewidth single-frequency Raman laser output can be achieved; but this The output wavelength of the technology is only the common 1.0μm band, and the output laser does not have the ability to be tuned in a wide range
Alternatively, the mid-infrared Raman laser can be obtained by using a near-infrared tunable laser pump source combined with a hollow-core fiber; It is an order of magnitude higher, and a large number of lens elements are used to form a coupling input / output space system, which has poor stability and reliability; in addition, the system coupling loss reaches 0.96dB, which is much higher than the loss of ordinary optical fiber fusion (typical value≦0.02dB)
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Embodiment Construction
[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. For the step numbers in the following embodiments, it is only set for the convenience of illustration and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art sexual adjustment.
[0034] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based...
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Abstract
The invention discloses a tunable single-frequency Raman laser, which comprises a tunable single-frequency fiber laser seed source which outputs tunable fundamental frequency light; an optical fiber amplification system which is used for performing power amplification on the fundamental frequency light and injecting the fundamental frequency light subjected to power amplification into a resonant cavity; and the resonant cavity comprising a Raman laser resonant system and a filtering frequency selection system, wherein the Raman laser resonance system comprises a first plano-concave lens, a Raman gain crystal, a second plano-concave lens and a third plano-concave lens and is used for generating Raman light; and the filtering frequency selection system comprises an F-P etalon and a volume grating and is used for selecting and outputting single-frequency Raman laser. According to the tunable single-frequency Raman laser, the single-frequency fiber laser is used as a fundamental frequency light source, and a stable guarantee is provided for the longitudinal mode of the single-frequency Raman laser; in addition, wavelength-tunable single longitudinal mode output is obtained by means of the F-P etalon and the volume grating, so that the tunable single-frequency Raman laser has high degree of freedom and can be widely applied to the field of lasers.
Description
technical field [0001] The invention relates to the field of lasers, in particular to a tunable single-frequency Raman laser. Background technique [0002] Because of its ultra-narrow spectral linewidth, ultra-long coherence length, and low noise, single-frequency lasers have important applications in the fields of fiber optic sensing, coherent lidar, high-power coherent combining, coherent optical communications, optical atomic clocks, and gravitational wave detection. Value. However, single-frequency fiber lasers based on ytterbium-doped, erbium-doped or thulium-doped gain fibers have a limited range of direct lasing wavelengths. Currently, the wavelength ranges covered are mainly concentrated in the 0.98-1.12 μm, 1.53-1.6 μm, and 1.75-2 μm bands. In addition to this band, it is difficult to obtain directly through conventional gain fibers. [0003] As an important branch of optical frequency conversion technology, stimulated Raman scattering belongs to the third-order n...
Claims
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IPC IPC(8): H01S3/067H01S3/094H01S3/08H01S3/108H01S3/30
CPCH01S3/06754H01S3/094046H01S3/1086H01S3/08027H01S3/08036H01S3/302
Inventor 杨昌盛徐善辉黄家敏关先朝赵齐来冯洲明杨中民
Owner SOUTH CHINA UNIV OF TECH
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