Abstract
In this paper, we reported an Yb-doped, femtosecond, chirped pulse amplification laser based on strictly all-fiber structure. It operated at a low repetition rate of 1 kHz and adopted the synchronously pumping technology to suppress ASE and heat accumulation. A chirped fiber Bragg grating providing adjustable dispersion is used as the pulse stretcher. High order dispersion induced by fiber, grating pair in the system was compensated accurately. Laser pulse with duration of 180 fs and energy of 112 μJ has been obtained. In addition, it has a high long-term stability of energy and a good beam quality, corresponding to energy fluctuation of 0.62% in an hour and M2 factor of 1.15, respectively.
Highlights
High energy femtosecond lasers have attracted increasing attention in recent years with promising applications in science [1], [2], medical [3] and industry [4], [5]
In this paper, we reported an Yb-doped, femtosecond, chirped pulse amplification laser based on strictly all-fiber structure
Noting that pre-amplifier is pumped by a SM-LD operating at continuous wave mode, since it is located in front of acoustic optical modulator (AOM) with pulse repetition rate of 8.7 MHz
Summary
High energy femtosecond lasers have attracted increasing attention in recent years with promising applications in science [1], [2], medical [3] and industry [4], [5]. Owing to excellent characteristics of fiber such as cost-efficiency, exceptional compactness, stability and alignment-free [6], [7], fiber lasers are arising as an important alternative to Ti:sapphire lasers, especially the Yb-doped fiber lasers which exhibit relatively high optical pump efficiencies and large gain bandwidth [8], [9] The development of these lasers has taken great strides by virtue of chirp pulse amplification (CPA) [10]–[14]. By optimizing pre-chirp grating pair, PCMA can achieve output pulses with sub-100 fs duration It has some weakness including the lower system efficiency and stability ascribed to introduction of more free space components. High pulse energy (exceeding 100 μJ) at kHz repetition rate with sub-200 fs duration from all-fiber structure is never reported before. The pulse energy can be further improved by an amplification stage using PCF
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