Femtosecond pulse generation from a topological insulator mode-locked fiber laser

Abstract

Abstract:We reported on the generation of femtosecond pulse in an anomalous-dispersion fiber ring laser by using a polyvinyl alcohol (PVA)-based Topological Insulator (TI), Bi 2 Se 3 saturable absorber (SA). The PVA-TI composite has a low saturable optical intensity of 12 MW/cm 2 and a modulation depth of ~3.9%. By incorporating the fabricated PVA-TISA into a fiber laser, mode-locking operation could be achieved at a low pump threshold of 25 mW. After an optimization of the cavity parameters, optical pulse with ~660 fs centered at 1557.5 nm wavelength had been generated. The experimental results demonstrate that the PVA could be an excellent host material for fabricating

Gold nanorod as saturable absorber for Q-switched Yb-doped fiber laser

“…Generally, only a saturable absorber (SA) needs to be inserted into the passively Q-switched fiber laser to keep the system convenient and simple. Till date, various SAs have been proposed to achieve passive Q-switching operation, such as semiconductor saturable absorber mirror (SESAM) [4,5], carbon nanotube (CNT) [6,9], graphene [10][11][12][13][14], topological insulator (TI) [15][16][17][18][19][20], and MoS 2 [21][22][23][24][25]. With the above mentioned SAs, the Q-switched pulse could be readily obtained in fiber lasers ranging from 1.0 μm to 2.0 μm waveband.…”

Bismuth (III) Telluride (Bi2Te3) Based Topological Insulator Embedded in PVA as Passive Saturable Absorber in Erbium-Doped Fiber Laser

“…Figure 3 shows the transmission spectrum of the fabricated Bi2Te3-PVA film and it shows the transmittance is at 21% at 1.5 m region. The film can also be investigated at 1 m and 2 m region showing the broadband properties of the Bi2Te3 based passive SA as the structure of the TI is not affected by host polymer [11]. Figure 4 shows the Raman spectrum of the developed Bi2Te3-PVA film with low peak at ~62 cm-1( A 1g 1 ), ~95(E g 2 ) and 11( A 1g 2 ), respectively.…”

Tutorial on fiber-based sources for biophotonic applications

“…107 Using WS 2 , mode locking of Er 108 and Ho-Tm 109 doped fiber lasers has been successfully demonstrated, while MoSe 2 has been used to produce picosecond pulses with an Er-doped fiber laser system. 110 Other material structures have recently been introduced such as black phosphorous that has allowed the generation of pulses as short as 272 fs with an Er fiber laser 111 and from the new family of topological insulators that have recently been identified, that currently contain more [112][113][114] Consequently, there is a vast array of saturable absorbing species that can be used to mode lock fiber lasers each with distinct yet quite complementary properties. Most commonly, the absorbers are deposited in a polymer host and mounted on the facet of the ferrule of a fiber connector; however, this configuration is prone to thermal and/or peak power damage problem and perhaps consideration should be given to absorbers mounted in optimized ultrathin glass hosts.…”