Large-power optical fiber-based single frequency pulse laser

Abstract

The invention discloses a large-power optical fiber-based single frequency pulse laser. The large-power optical fiber-based single frequency pulse laser comprises a pumping source, a beam combiner, a wideband fiber bragg grating, two thermoelectric coolers (TEC), an input collimator, a nonlinear crystal, a temperature controlling stove, an output collimator, a high-gain ytterbium-doped optical fiber, a narrowband polarization-maintaining fiber grating, PZT piezoelectric ceramic and dichroscope. According to the large-power optical fiber-based single frequency pulse laser, a single longitudinal mode (single frequency) fundamental frequency laser with the wave length ranging from 960 nm to 980 nm can be achieved on the basis of a short linear cavity Q-switch mode and an inner cavity frequency doubling structure. By means of the thermoelectric coolers (TEC), segmented temperature regulation is conducted, the PZT piezoelectric ceramic stretches out and draws back to precisely control the wavelength match state corresponding to the fiber bragg grating, internal loss of a resonant cavity can be modulated, and therefore Q-switch single frequency pulse fundamental frequency laser output is achieved; single frequency pulse laser output based on an optical fiber form is finally achieved by improving harmonic conversion efficiency and output power of frequency doubling blue light through a centimetre length nonlinear crystal and the inner cavity frequency doubling structure.

Description

technical field [0001] The invention relates to a fiber laser, especially a single-frequency blue pulse laser for Q-switching based on centimeter-scale short linear cavity and inner cavity frequency doubling structure, using PZT piezoelectric ceramic electrostriction and thermoelectric cooler TEC segmental temperature control. Background technique [0002] Single-frequency fiber laser can operate in a single longitudinal mode state, not only has the characteristics of good heat dissipation, high efficiency, and compact structure of ordinary fiber lasers, but also has the advantages of narrow output spectral linewidth, low noise, and low threshold. However, in the case that the short-wavelength band (< 0.8 µm) lacks a gain medium and can directly generate laser light, second harmonic generation (SHG) frequency doubling is an effective means to obtain a short-wavelength laser source. In particular, the frequency-doubled 980nm single-mode laser can obtain the 490nm blue ligh...

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Problems solved by technology

Related patents are: (1) In 2013, Shandong Haifu Photonics Technology Co., Ltd. applied for a patent for a single-frequency pulsed blue light source [public number: CN 103545702A], which uses a piezoelectric element to periodically press the gain fiber to modulate 978nm fundamental frequency light The polarization direction is Q-switched, the nonlinear crystal is placed outside the resonator, and the external cavity frequency doubled single-frequency pulse blue light output is realized, but the required blue light laser does not have the characteristics of all-fiber, and the structure is more complicated

(2) In 2015, the Institute of Semiconductors of the Chinese Academy of Sciences applied for a patent on a tunable blue-ray laser device [publication number: CN 105428986A], using an 808nm semiconductor laser frequency-doubling sector-shaped polarization periodic crystal to realize a tunable frequency-doubling blue laser output , but the required blue laser does not have single frequency and pulse output characteristics

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