Doubly Q-switched laser with electric-optic modulator and GaAs saturable absorber

Abstract

By using both electric-optic (EO) modulator and GaAs saturable absorber, a doubly actively-passively Q-switched laser is realized for the first time. Especially, the more symmetric and shorter pulse is generated in comparison to purely EOactively or GaAs-passively Q-switched laser. In addition, a symmetric factor is defined to describe the temporal symmetry of the pulses. The experimental results show that it is possible to obtain a more symmetric pulse in doubly Q-switched laser. The symmetry factor Pulse symmetric factor versus the transmission of output coupler

Graphene sheet stacks forQ-switching operation of an erbium-doped fiber laser

“…Q-switched erbium-doped fiber lasers show versatile applications in fiber communication, fiber sensors, range finding and laser processing. There are two types of Q-switching method: active [1][2][3][4][5][6] and passive Q-switching [7][8][9][10][11][12]. The latter has several advantages, such as compactness, low cost, flexibility, and simplicity of design.…”

Q‐switched mode‐locked Nd:GGG laser with MoS2–SnSe2 heterojunction nanosheets

“…Figure 5 shows the pulse waveform of the QSML Nd:GGG laser at an incident pump power of 5 W. The QSML pulses were quite stable with a repetition rate of 83.3 MHz. The pulse width of the mode-locked pulse could be calculated by the following equation [27][28][29] :…”

“…Figure 5 shows the pulse waveform of the QSML Nd:GGG laser at an incident pump power of 5 W. The QSML pulses were quite stable with a repetition rate of 83.3 MHz. The pulse width of the mode‐locked pulse could be calculated by the following equation 27–29 : $$${t}_{{\text{real}}^{2}}={t}_{{\text{meature}}^{2}} \mbox{-} {t}_{{\text{probe}}^{2}} \mbox{-} {t}_{{\text{oscilloscope}}^{2}}.$$$…”

Graphene-PVA saturable absorber for generation of a wavelength-tunable passively Q-switched thulium-doped fiber laser in 2.0µm

“…Between the two techniques, passive Q-switching is preferable since it offers simplicity, flexibility and versatility of design. Active techniques usually require the use of acousto-optic and electro-optic modulators to modulate the losses within the laser cavity, which can be rather bulky and costly compared to the passive techniques [5][6][7]. One of the most common methods to obtain a passive Q-switched output is by the use of saturable absorbers (SAs), such as semiconductor saturable absorber mirrors (SESAMs) [8,9], topological insulators (Tis) [10,11], carbon nanotubes-based SAs [12], and graphene [13], to name a few.…”