High-precision and wide-tunability single-frequency optical fiber laser

Abstract

The invention provides a high-precision and wide-tunability single-frequency optical fiber laser. The high-precision and wide-tunability single-frequency optical fiber laser includes a multi-component glass optical fiber, a broadband optical fiber grating or a dual-color mirror, a narrow-band optical fiber grating, a wavelength division multiplexer, an optical isolator, a pump source, a laser frequency tuning device and a heat sink, wherein the laser frequency tuning device is composed of a PZT piezoelectric ceramic assembly and a precise temperature controller. According to the high-precision and wide-tunability single-frequency optical fiber laser of the invention, the laser can be made to be in single longitudinal mode operation based on a short straight F-P linear resonant cavity structure of the multi-component glass optical fiber; a precise temperature control technology and a piezoelectric ceramic assembly stretching technique are combined with each other so as to adjust a laser resonant cavity, and therefore, the frequency of the high-precision, wide-range and continuous-tuning laser can be improved; and an all-optical fiber link structure is used in cooperation, and therefore, high-tuning precision, wide-tuning range and high-stability frequency-tunable single-frequency optical fiber laser output can be realized. The frequency tuning precision of the high-precision and wide-tenability single-frequency optical fiber laser of the invention is smaller than 1MHz, and the tunable range of the optical fiber laser of the invention can achieve 800pm, and the output power of the optical fiber laser is larger than 100mW, and the linewidth of the optical fiber laser is smaller than 10kHz.

Description

technical field [0001] The invention relates to the field of fiber laser technology applied in the fields of coherent optical communication, laser ranging, fiber optic sensing, Doppler laser speed measuring radar, etc., and specifically relates to a single-frequency fiber laser with high tuning precision and wide frequency tunable. Background technique [0002] Single-frequency fiber laser refers to the output in the form of a single longitudinal mode of vibration in the laser cavity, which is characterized by a very narrow laser spectral linewidth, up to 10 -8 nm, which is 2 orders of magnitude narrower than the line width of the best existing narrow line width semiconductor DFB laser, and 5 to 6 orders of magnitude narrower than the line width of the DWDM signal light source in the current optical communication network. The narrow linewidth can ensure that the laser has very good coherence characteristics, and its coherence length can reach hundreds of kilometers. Due to ...

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Problems solved by technology

In addition, in 2005, Shanxi University applied for a single-frequency tunable laser patent [Publication No.: CN1770574A], using Nd-doped solid crystal gain medium and electro-optic crystal to form a laser resonator, realizing laser frequency tunability, but the required single Frequency lasers do not have all-fiber, wide linewidth, and poor reliability

In 2011, IPG Corporation of the United States applied for a patent for a high-power narrow-linewidth fiber laser [Publication No.: US7903696B2], which uses two ultra-short single-frequency resonators to output low-power narrow-linewidth single-frequency laser signals, which are passed through ordinary erbium-doped fiber amplifiers Two-stage laser power amplification with high-power double-clad fiber amplifiers, but the fiber lasers required do not have frequency tunable features

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