Study on the repetition rate locking system of the femtosecond laser

Chunbo Zhao; Tengfei Wu; Li Zhang; Zhenyu Zhu

doi:10.1117/12.2179217

13 April 2015 Study on the repetition rate locking system of the femtosecond laser

Chunbo Zhao, Tengfei Wu, Li Zhang, Zhenyu Zhu

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 95220M (2015) https://doi.org/10.1117/12.2179217
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

The new technique known as “The femtosecond frequency comb technology” has dramatic impact on the diverse fields of precision measurement and nonlinear optical physics. In order to acquire high-precision and high-stability femtosecond comb, it’s necessary to stabilize the repetition rate f_Rep and the offset frequency f₀. This article presents the details of stabilizing and controlling the comb parameter f_Rep and finally phase lock the repetition rate of femtosecond laser to a radio frequency reference, derived from an atomic clock. In practice, the narrower the bandwidth of lock system (close-loop system), the higher stability we can achieve, but it becomes easier to be unlocked for external disturb. We adopt a method in servo unit to avoid this problem in this paper. The control parameters P and I can be adjusted and optimized more flexibly. The lock steps depend on the special servo system make it easier to find the right parameters and the lock becomes more convenient and quickly. With this idea, the locked time of repetition rate can be as long as the mode-locking time of the laser. The stability of laser can be evaluated by allan deviation. In this research, the contrast of stability of f_Rep between the locked laser and the unlocked is given. The new lock system is proved reasonable.

Citation Download Citation

Chunbo Zhao, Tengfei Wu, Li Zhang, and Zhenyu Zhu "Study on the repetition rate locking system of the femtosecond laser", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95220M (13 April 2015); https://doi.org/10.1117/12.2179217

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KEYWORDS

Femtosecond phenomena

Servomechanisms

Atomic clocks

Ferroelectric materials

Collimators

Fiber lasers

Frequency combs

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