Research On Miniaturized Fiber Pulse Laser With Synchronous Dual-wavelength

Due to the characteristics such as brightness,monochromaticity,directionality and coherent,lasers have potential applications in various fields.Laser can be divided into continuous-wave laser and pulse laser.Pulse lasers,especially ultrashort pulse lasers obtained by mode-locking,have been famous for high peak power and short pulse duration.However,traditional pulse lasers are failed to meet the requirements in many fields such as pump detection,Raman scattering spectroscopy,and differential frequency mixing because of the single wavelength,complex structure,large size,and complicated operation.Therefore,how to obtain the synchronous output laser with two pulse laser in different wavelength based on a set of systems has become a hotspot in the development of laser technology.The paper focus on developing pulse laser with synchronous dual-wavelength.The dual-wavelength fiber laser is designed based on two femtosecond pulsed fiber seeders,those which wavelengths can be adjustable in a small range.A research example of laser with dual-wavelength in 900 nm and 780 nm is selected.The main research contents are as follows:1)The fiber pulse oscillator and amplifier based on polarization maintaining fiber are studied.Both the ytterbium-doped and erbium-doped fiber oscillators,whose wavelength are at 1030 nm and 1560 nm respectively,can be easy to work at mode-locking state based on semiconductor saturable absorbers mirror.And amplifying the laser energy and compressing the laser pulse are researched furtherly in order that the target wavelength can be transformed.And then two stable pulse amplifier systems are developed,those which pulse width are both less than 100 femtosecond.2)The nonlinear optical frequency conversion is studied.Different methods were taken to conversed frequency for the ytterbium-doped fiber amplifier system and erbium-doped fiber amplifier system.Photonic crystal fiber is used in the former system to complete the generation of supercontinuum,whose short-wave can reach 866 nm.Periodically polarized lithium niobate crystals doped with magnesium oxide are applied in the latter system to transfer the central wavelength from 1560 nm to 779 nm.3)The frequency stabilization and synchronization are discussed in the final part.It is well known that the high synchronous precision depends on the repetition frequency stability of a single-wavelength pulsed laser.Frequency stabilization system of above two developed laser system are built using existing circuit modules.A technological scheme with similar idea of the frequency stabilization technology for dual-wavelength pulse laser synchronouzation is developed.Results show the frequency deviation of the scheme is only 1.34 m Hz.The miniaturized fiber pulse laser with synchronous dual-wavelength can be developed using two fiber oscillators and nonlinear frequency conversion.It is a new and reliable idea for the realization of dual-wavelength laser.