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Device for simultaneously reducing intensity noise and frequency noise of single frequency laser and working method thereof

A technology of intensity noise and single-frequency laser, which is applied in the direction of lasers, laser components, and the structure/shape of active media, can solve problems that do not take into account the influence of laser output power optical frequency jitter, and achieve the effect of avoiding processing

Active Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

It is worth pointing out that the above mechanism research on the frequency noise limit does not take into account the influence of the laser output power on the optical frequency jitter

Method used

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  • Device for simultaneously reducing intensity noise and frequency noise of single frequency laser and working method thereof
  • Device for simultaneously reducing intensity noise and frequency noise of single frequency laser and working method thereof
  • Device for simultaneously reducing intensity noise and frequency noise of single frequency laser and working method thereof

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Embodiment

[0034] The single-frequency fiber laser module 6 as the final noise suppression object can be a single-frequency fiber laser source based on stimulated radiation working in any band, and its gain medium is doped with one or more of lanthanide ions and transition metal ions Assembled single-component or multi-component glass optical fibers. For a single-frequency fiber laser cavity structure, it can be a linear cavity or a ring cavity based on frequency-selective components such as fiber Bragg gratings, dichromatic mirrors, saturable absorbers, unpumped active fibers, or narrow-band filters. Meanwhile, the single-frequency fiber laser module 6 can have any polarization state, output characteristics of continuous or pulse and frequency modulation or frequency non-modulation. The coupling mode of the pump source can be designed according to the specific laser cavity structure. According to the output direction of the single-frequency laser, it can be divided into three pumping mo...

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Abstract

The invention provides a device for simultaneously reducing an intensity noise and a frequency noise of single frequency laser and a working method thereof. The device comprises a single mode semiconductor pump light source, a laser power stabilizing device, a wavelength division multiplexer, a single frequency fiber resonant cavity and a fiber optic isolator. According to the method, based on the fact that at the low-frequency stage, the intensity noise and the frequency noise of a single frequency fiber laser both come from a pump laser intensity noise, the low-frequency intensity noise of the pump laser is directly reduced in an amplitude modulation mode, and accordingly the effect of simultaneously reducing the two noises at the low-frequency stage is achieved. A single frequency fiber laser source with ultra-stable output power and frequency is obtained through the simple and practical method, and the method has wide application prospect and huge application value in the fields of ultrahigh precision and super-remote distance laser ranging, optical fiber sensing and atom and molecular spectroscopy.

Description

technical field [0001] The invention relates to the technical field of single-frequency fiber laser, in particular to a device and a working method for simultaneously reducing single-frequency laser intensity and frequency noise. [0002] Background technique [0003] Due to its ultra-narrow linewidth and ultra-long coherence length, single-frequency fiber lasers are widely used in ultra-high-precision and ultra-long-distance laser ranging, coherent optical communication, optical fiber sensing, laser radar (LIDAR), coherent synthesis and other fields. Broad application prospects and great application value. As an important indicator of single-frequency laser, noise is a key factor restricting its further application. For example, in high-precision sensing, the noise in the laser will be mixed with the detection signal and transformed into system noise, thereby affecting the detection accuracy and sensitivity. Therefore, studying and improving the noise characteristics of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/0941H01S3/13
Inventor 徐善辉杨中民李灿冯洲明
Owner SOUTH CHINA UNIV OF TECH
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