Wavelength space adjustable double-color soliton pulse light source system

Abstract

The invention provides a pre-chirp and SSFS (Soliton Self-Frequency Shift) based wavelength space adjustable double-color soliton pulse light source system which is suitable for the technical field of lasers. The wavelength space adjustable double-color soliton pulse light source system comprises a femtosecond laser, a pre-chirp optical device, a lens and an anomalous dispersion optical fiber along the direction of an optical path; the femtosecond laser is used for generating a first soliton and a second soliton; the energy of the input pulse of the femtosecond laser can be adjusted and the soliton order number N is increased along with the increase of the energy of the input pulse; the pre-chirp optical device is used for adjusting the width of the input pulse to ensure that the wavelength of the first soliton is maintained to be unchanged under the condition that the soliton order number is improved; the adjustment direction on the width of the input pulse is the same as that of the energy of the input pulse of the femtosecond laser. According to the wavelength space adjustable double-color soliton pulse light source system, the wavelength space tuning between the two solitons is based on the basic attribute of soliton components in high-order solitons, namely that the higher the soliton order number N, the closer the peak power and the pulse width of the two solitons, and accordingly the wavelength space between the two solitons after the SSFS is small.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a two-color soliton pulse light source system with adjustable wavelength spacing based on pre-chirp and soliton self-frequency shift. Background technique [0002] Since its first discovery in 1986, soliton self-frequency shifting (SSFS) in optical fibers has been extensively exploited to fabricate wavelength-tunable femtosecond pulsed sources transmitted through optical fibers. SSFS originates from intrapulse stimulated Raman scattering, which continuously transfers energy from high frequency to low frequency, resulting in a redshift of the soliton wavelength. The generation and maintenance of solitons require anomalous dispersion, that is, negative group velocity dispersion (GVD, β 2 <0). A variety of anomalous dispersion fibers, including standard single-mode fibers (SSMFs), index-guided photonic crystal fibers (PCFs), hollow-core photonic bandgap fibers (PBGFs...

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Problems solved by technology

Therefore, for each pair of fluorophores used for imaging, the length of the optical fiber is designed in advance and is fixed. The problem with this method is that if one fluorophore is replaced by another fluorophore with a different two-photon absorption peak, due to Inability to tune wavelength spacing and thus simultaneous efficient excitation imaging

In addition, two solitons with adjustable spacing can also be generated by polarization multiplexing. The problem is that there may be two solitons generated along one polarization axis, and the shorter one will be close to the desired wavelength of the soliton polarized along the vertical axis. , thereby interfering with the final fluorescent signal, making quantitative analysis of the final image impossible

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