Numerical investigation of GHz repetition rate fundamentally mode-locked all-fiber lasers

Abstract

GHz repetition rate fundamentally mode-locked lasers have attracted great interest for a variety of scientific and practical applications. A passively mode-locked laser in all-fiber format has the advantages of high stability, maintenance-free operation, super compactness, and reliability. In this paper, we present numerical investigation on passive mode-locking of all-fiber lasers operating at repetition rates of 1-20 GHz. Our calculations show that the reflectivity of the output coupler, the small signal gain of the doped fiber, the total net cavity dispersion, and the modulation depth of the saturable absorber are the key parameters for producing stable fundamentally mode-locked pulses at GHz repetition rates in very short allfiber linear cavities. The instabilities of GHz repetition rate fundamentally mode-locked allfiber lasers with different parameters were calculated and analyzed. Compared to a regular MHz repetition rate mode-locked all-fiber laser, the pump power range for the mode-locking of a GHz repetition rate all-fiber laser is much larger due to the several orders of magnitude lower accumulated nonlinearity in the fiber cavity. The presented numerical study provides valuable guidance for the design and development of highly stable mode-locked all-fiber lasers operating at GHz repetition rates.

Numerical investigation of 1550 nm passively mode-locked diode lasers with different gain and absorber configurations

“…A growing number of scientific and practical applications rely on mode-locked lasers with high peak power sufficient to accomplish the tasks on an ultrashort timescale without inducing any other side effects [5,6]. Passive mode-locking of semiconductor lasers is a very promising method for the generation of low repetition rate picosecond pulses, which is of paramount importance for a number of applications [7]. The passive mode-locked technique, one of commonly used mode-locked techniques, can also be applied on multisection semiconductor lasers.…”

“…Due to an error during production, an update to the citations was not made in this paper which has resulted in the citations for references [4][5][6][7][8][9] being misplaced. The second paragraph of the introduction should read as follows:…”

“…Mode-locked semiconductor lasers capable of producing ultrashort pulses with picosecond durations have enormous impacts on many disciplines of science and technology. A growing number of scientific and practical applications rely on mode-locked lasers with high peak power sufficient to accomplish the tasks on an ultrashort timescale without inducing any other side effects [6,7]. Passive mode-locking of semiconductor lasers is a very promising method for the generation of low repetition rate picosecond pulses, which is of paramount importance for a number of applications [8].…”

Few-Layer Bismuthene for Coexistence of Harmonic and Dual Wavelength in a Mode-Locked Fiber Laser

“…These properties demonstrate that bismuthene has potential application for spintronics, designing and fabricating room-temperature nondissipative quantum computing devices, ultrafast pulse lasers, and so on. ,− Ultrashort pulse fiber lasers have also garnered tremendous interest from the researchers because of the compact design structure, low cost, high-efficiency of heat dissipation, and convenient operation. It has been widely applied to many field including materials microprocessing, medicine surgery, and optical fiber telecommunication systems. − Huge numbers of materials, such as semiconductor saturable absorber mirrors, graphene, topological insulators, black phosphorus, transition metal dichalcogenides, noble metal nano materials, transition metal chalcogenides, and so on, have been reported to be applied to the generation of ultrashort pulse laser because of its saturable absorption. − In addition, broadband, GHz high repetition rate, tunable, and switchable multiwavelength ultrafast fiber lasers also attract further attention because of its potential application in many fields. − Moreover, few-layer bismuthene also can be used in the field of ultrafast photonics and nonlinear optics to achieve ultrashort pulse laser. In 2018, Lu et al reported an ultrafast fiber laser with 652-fs optical pulse duration at a center wavelength of 1559.18 nm .…”

Linear cavity fiber laser harmonically mode-locked with SESAM

“…As a result, such lasers do not require periodic polarization adjusting that facilitates their self-starting and increases stability. Fundamentally mode-locked linear cavity fiber lasers with high pulse repetition rates (∼ GHz) are known [13,14]. Their obvious disadvantages arising from their short cavity (∼10 cm) are a small output power, limited tuning options and high requirements for cavity components (mirrors, pump diodes, etc).…”