We propose a 1950nm high average power, large pulse energy narrow-linewidth nanosecond pulse fiber laser. A closed-loop temperature control technique is employed in the design of the seed laser driving circuit system to ensure high power, high wavelength stability, and ultra-low noise characteristics. The acousto-optic modulator (AOM) is used to modulate the pulse of a continuous seed laser, and the rise time of the output pulse can be controlled to obtain the desired pulse shape and width. A master oscillating power amplifier (MOPA) structure is adopted to amplify the modulated power of the laser. Amplified by cascade amplification technique, the average output power of the pulse with the output pulse train has a repetition rate of 10MHz is 3.5W and the pulse width is 300ns, corresponding to a peak power of 1.17kW and a pulse energy of 350μJ. This type of fiber laser has vast possibilities of application especially in lidar and high-precision measurement.
In this work, an all-fiber high-power cascaded master-oscillator power amplifier (MOPA) system emitting frequency-stabilized single-frequency laser pulses at 1550 nm is presented. An external cavity laser diode with a narrow linewidth of 5 kHz is used as the seed source. Owing to the use of frequency locking components and a matched closed-loop system, the seed source has stable output frequency and power. The on-off extinction ratio of 80 dB is achieved by using digital and analog acousto-optic modulators in series. Then the seed laser is amplified by a three-stage cascaded all-fiber amplifier consisting of two pre-amplifiers and one main amplifier. The MOPA system delivers 200-ns laser pulses with a peak power of 800 W at a repetition rate of 10 kHz. The output laser has an operating linewidth close to the transform-limited. The polarization-extinction ratio is 20 dB, and the optical signal-to-noise ratio is higher than 45 dB. The monolithic all-fiber Erbium-Ytterbium co-doped pulsed fiber amplifier can be used as the high-energy radar transmitter of compact long-distance coherent Doppler lidar systems.
In this article, a fiber-solid hybrid amplification picosecond laser system is developed. The maximum single pulse energy of the fiber seed source can exceed 50 nJ and the beam quality factor M2 is less than 1.10. After two-stage traveling-wave amplifiers, the final average power of 23.6 W was obtained, corresponding to the maximum single pulse energy of 118 μJ with a repetition rate of 200 kHz. The research results of this article can provide an effective reference for the implementation of a higher-power Nd: YVO4 laser system.
An erbium-doped fiber laser based on nonlinear polarization rotation (NPR) mode-locking is proposed. On account of the multi-mode interference filtering effect introduced by the laser cavity multi-mode fiber, by adjusting the cavity polarization controllers, the laser generates dual-wavelengths of 1533.48 nm/1547.61 nm, 1549.16 nm/1561.94 nm, 1533.14 nm/1562.96 nm, and triple-wavelengths of 1533.43 nm, 1548.46 nm and 1562.68 nm, corresponding to 388.95 kHz, 388.93 kHz and 388.91 kHz, respectively. The compact structure of the system has potential applications in spectroscopy, optical communication, optical sensing and other fields.
In recent years, 1.3 μm lasers have been widely used in laser medical treatment, optical fiber communication and optoelectronic countermeasures, etc. In this paper, the unstable cavity structure with double pump cavity connected in series and the method to optimize the thermal lens effect are used to obtain a maximum 41 W average power of continuous-wave laser. Meanwhile, the pulsed laser is realized through an acousto-optic Q switch and the repetition rate can be adjusted in the range of 1~10 kHz. The maximum single pulse energy can reach 8.44 mJ with the repetition frequency of 1 kHz, corresponding to 65 kW peak power. In the future, the output power will be further improved by optimizing the laser, which will be beneficial to expand the applications in related fields.
Based on an all-fiber master oscillator power amplifier (MOPA) structure, a 1950-nm narrow-linewidth, single-mode, high peak power nanosecond pulsed fiber laser was developed. The seed source is a distributed feedback (DFB) semiconductor laser with a linewidth of 0.5 MHz. A precise and stable closed-loop temperature control technology is used to design the driving circuit of the seed laser, which ensures the stability of the laser wavelength and power, and greatly reduces the frequency and intensity noise of the laser. The continuous seed laser is modulated by an acousto-optic modulator (AOM). At the same time, the high-frequency control technology of acousto-optic modulator and cascade amplification technology are used to realize the continuous adjustable of laser pulse shape (Gaussian pulse or square wave pulse), repetition rate (1 kHz ~ 300 kHz) and pulse width (50 ns ~ 500 ns) of 2.0 μm band single frequency laser. This laser is very suitable for coherent lidar applications
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