High pressure nonlinear enhancement based near-infrared few-cycle pulse generation system and method

By increasing the air pressure to 20-90 bar in the hollow anti-resonant fiber and combining it with a closed-loop air pressure tuning mechanism, the nonlinear spectral broadening and dispersion imbalance of near-infrared low-energy femtosecond pulses were solved, achieving high-quality few-period pulse output and avoiding soliton breakage and coherence degradation.

CN122267603BActive Publication Date: 2026-07-24ANHUI UNIV
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Patent Information

Application Number
CN202610703117.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-21
Publication Date
2026-07-24
Estimated Expiration
2046-05-21

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve nonlinear spectral broadening, coherence preservation, and pulse-limited compression of near-infrared low-energy femtosecond pulses in hollow anti-resonant fibers, and blindly applying pressure may lead to soliton breakage and coherence degradation.

Method used

By increasing the gas pressure in the hollow anti-resonant fiber to a high-pressure range of 20-90 bar, the gas nonlinear coefficient is enhanced. Combined with a closed-loop gas pressure tuning mechanism based on time-domain waveform quality criteria, the distance from the self-compression focal point to the fiber truncated end face is precisely adjusted to achieve a dynamic balance between dispersion and nonlinearity.

Benefits of technology

Without the need for external dispersion compensation devices, it directly outputs high-quality near-infrared short-cycle pulses with pulse widths on the order of short cycles. The energy is concentrated and highly coherent, the system has a compact structure, and its stability and practicality are significantly improved.

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Abstract

The present application belongs to the field of ultrafast laser and nonlinear optics, and particularly relates to a near-infrared few-cycle pulse generation system and method based on high-pressure nonlinear enhancement. The method fills inert gas into a hollow-core anti-resonant optical fiber and adjusts the gas pressure to the high-pressure interval of 20 bar-90 bar, enhances the nonlinear coefficient of the gas to realize the dispersion and nonlinear dynamic balance of the pulse in the waveguide, thereby compensating for the insufficient peak power of the low-energy pump pulse. The pulse feedback module collects the output time-domain intensity waveform and extracts the main peak energy proportion and the splitting factor as feedback indexes. The control module diagnoses the offset state of the self-compression focal point relative to the truncated end face according to the feedback indexes, controls the small-step pressure regulation of the gas pressure regulation module to anchor the focal point on the truncated end face, and directly outputs high-quality and high-coherence near-infrared few-cycle pulses without external dispersion compensation devices.
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