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Frequency modulating single frequency fiber laser

A fiber laser and frequency modulation technology, which is applied to lasers, laser components, phonon exciters, etc., can solve problems such as mode hopping, complex frequency modulation process, and mode competition, and achieve large frequency modulation range and large frequency modulation Range, easy-to-achieve effects

Inactive Publication Date: 2013-10-02
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

In addition, the current internal modulation schemes use PZT piezoelectric ceramics to modulate the entire laser cavity including the Bragg grating, which will change the periodic structure of the refractive index of the grating, making the frequency modulation process more complicated, and There will also be phenomenons such as mode hopping and mode competition

Method used

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  • Frequency modulating single frequency fiber laser
  • Frequency modulating single frequency fiber laser
  • Frequency modulating single frequency fiber laser

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Embodiment

[0028] Figure 1-3 It is a schematic diagram of the principle of a frequency-modulated single-frequency fiber laser in Embodiment 1 of the present invention. A high-gain rare-earth-doped phosphate single-mode glass fiber 4 is used as the gain medium of the laser, and a narrow-band fiber Bragg grating 3 and a broadband fiber Bragg grating 5 or two The color mirrors form the front and rear cavity mirrors of the short F-P cavity structure. The central reflection wavelength of the narrow-band fiber Bragg grating 3 is located in the gain spectrum of the laser medium and in the high reflection spectrum of the rear cavity mirror, with a reflectivity greater than 90%. The pump light adopts single-mode LD forward pumping mode and is coupled by the pump end of the wavelength division multiplexer 2 ( figure 1 ), or directly coupled into broadband fiber Bragg grating 5 by single-mode LD ( figure 2 ), or the two-way pump coupling used by the first two methods at the same time ( image 3 ...

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Abstract

The invention provides a frequency modulating single frequency fiber laser which comprises a novel rare earth doping phosphate glass optical fiber, a narrow band Prague fiber grating, a dichroic mirror or a broadband Prague fiber grating, a single-mode semiconductor pump light source, a wavelength division multiplexer, a fiber optic isolator and PZT (Pbbased Lanthanumdoped Zirconate Titanates) piezoelectric ceramics. The PZT piezoelectric ceramics is adopted by a laser short cavity structure to modulate a single longitudinal mode frequency of a short phosphate glass fiber laser resonant cavity, so that frequency modulating fiber laser output with good single frequency performance is realized, wherein the frequency modulation range can reach up to 1 GHz. The frequency modulating single frequency fiber laser can be applied to the detecting field of laser ranging and Doppler laser speed measuring radar with ultrahigh precision and ultra distance.

Description

Technical field [0001] The present invention involves single -mode (or single -frequency) fiber -fiber laser, which specifically involves frequency modulation single -frequency optical fiber laser. [0002] Background technique [0003] Single vertical mode (or single -frequency) optical fiber laser refers to the output of laser in the form of a single vertical mold in the cavity. -8 NM, the line width of the best narrow line width DFB lasers is narrower, which is two magnitude magnitude, which is 5 to 6 levels of line width of the lines of DWDM signal light sources in the current optical communication network.The narrow line width can ensure that the laser has very good coherent characteristics, and its coherent length can reach hundreds of kilometers.The reason why narrow -line wide fiber laser laser is valued because it has a wide range of applications in the field of laser ranging, fiber sensing and communication.For example, most laser rangers are based on the principle of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/08H01S3/139H01S3/16
Inventor 徐善辉杨中民李灿冯洲明张勤远姜中宏
Owner SOUTH CHINA UNIV OF TECH
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