Single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power

Abstract

The invention discloses a single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power. Polarization maintaining optical fiber is rare-earth-doped phosphate single-mode glass optical fiber, the component of a fiber core is phosphate glass which consists of 70P2O5-8Al2O3-15BaO-4La2O3-3Nd2O3, the fiber core of the polarization maintaining optical fiber is doped with high-concentration luminous ions, the luminous ions are one or combination of more than one of lanthanide ions and transition metal ions, the doping density of the luminous ions is greater than 1*10<19>ions / cm<3> and the luminous ions are evenly doped in the fiber core. A polarization maintaining fiber Bragg grating with the narrow linewidth and a dichroscope form a front cavity mirror and a rear cavity mirror of the optical fiber laser, a centimeter-sized erbium-ytterbium co-doped phosphate glass polarization maintaining optical fiber is taken as a laser working substance, and polarization maintaining output laser generated by a single-mode semiconductor laser is taken as a pumping source, thus achieving the single longitudinal-mode laser output by designing and manufacturing the reflection spectrum width of the polarization maintaining fiber Bragg grating and controlling the cavity length of the whole laser cavity.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a low-noise, narrow-linewidth, and high-power single-longitudinal-mode fiber laser. The linewidth of the laser reaches the KHz level, and the output power reaches the order of hundreds of mW. Background technique [0002] Ultra-narrow linewidth single-frequency laser has a wide range of application prospects in industry, agriculture, military and other fields due to its excellent coherence performance, especially in long-distance, high-precision sensing, laser ranging and indication. To improve the detection distance or accuracy of fiber laser, it is necessary to use laser with high coherence performance. Therefore, the laser is required to have a spectral width with ultra-narrow linewidth. For example, a single-frequency fiber laser with KHz linewidth and mW level is required as a seed source. It is difficult to achieve high power (>100mW) and ultra-narrow linewidth (<2KHz) single-frequenc...

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Problems solved by technology

In 2004, Alexander University and NP Photonics applied for a rare earth-doped phosphate glass single-mode fiber laser [patent number: US 6816514 B2] and a high-power narrow-linewidth single-frequency fiber laser in the research of ultra-narrow linewidth single-frequency fiber laser. Laser [publication number: US 2004 / 0240508 A1] two patents, it is based on (30-80)P 2 o 5 -(5-30)L 2 o 3 (L 2 o 3 :Al 2 O, B 2 o 3 , Y 2 o 3 , La 2 o 3 And their mixture) - (5-30) MO (MO: BaO, BeO, MgO, SrO, CaO, ZnO, PbO and their mixture) rare earth doped phosphate glass single-mode optical fiber of this matrix, and for each However, the rare-earth-doped phosphate glass single-mode optical fiber required does not have polarization-maintaining properties

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