Study on simultaneous passive Q-switching and mode-locking at low-pump power in a LD-pumped Nd3+:YVO 4 -Cr4+:YAG laser

This study reports a Q-switching-based, 2058-nm holmium (Ho) fiber laser incorporating a saturable absorber (SA) based on graphene oxide (GO). The SA was prepared with a side-polished fiber, while GO particles were deposited onto the fiber-polished surface to realize an all-fiber SA. A continuous-wave thulium-doped all-fiber laser, which was configured with a master-oscillator power-amplifier (MOPA) structure, was constructed as a pumping source. By inserting the fabricated SA into an all-fiber ring resonator based on 1-m length of Ho-doped fiber, Q-switched pulses could readily be obtained at a wavelength of 2058 nm. The pulse width was observed to vary from 2.01 to 1.56 μs as the pump power was adjusted from ~759 to 1072 mW, while the repetition rate was tunable from 45.56 to 56.12 kHz. The maximum values of average optical power and pulse energy were measured as ~11.61 mW and 207.05 nJ, respectively, at a ~1072 mW pump power.

Download Full-text

Phase characteristics of pulses from an Nd : YAG laser with active mode locking

Quantum Electronics ◽

10.1070/qe1997v027n11abeh001084 ◽

1997 ◽

Vol 27 (11) ◽

pp. 968-971

Author(s):

A A Apolonskii ◽

V P Drachev ◽

Yu I Krasnikov ◽

S V Perminov

Keyword(s):

Mode Locking ◽

Yag Laser ◽

Active Mode

Download Full-text

Q-SWITCHED THULIUM-DOPED FIBER LASER AT 2 MICRON REGION BY 802 NM PUMPING

Jurnal Teknologi ◽

10.11113/jt.v74.4729 ◽

2015 ◽

Vol 74 (8) ◽

Author(s):

A. A. Latiff ◽

M. T. Ahmad ◽

Z. Zakaria ◽

H. Ahmad ◽

S. W. Harun

Keyword(s):

Carbon Nanotubes ◽

Pump Power ◽

Fiber Laser ◽

Saturable Absorber ◽

Pulse Width ◽

Laser Cavity ◽

Pulse Generation ◽

Q Switching ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

An 1892.4 nm ultrafast passive Q-switched fiber laser is demonstrated by using Thulium-doped fiber (TDF) in conjunction with a multi-walled carbon nanotubes (MWCNTs) as a saturable absorber (SA). The MWCNTs film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity with 802 nm pump for Q-switching pulse generation. The pulse repetition rate can be tuned from 3.8 to 4.6 kHz while the corresponding pulse width reduces from 22.1 to 18.4 μs as the pump power is increased from 187.3 to 194.2 mW. A higher performance Q-switched Thulium-doped fiber laser (TDFL) is expected to be achieved with the optimization of the MWCNT-SA saturable absorber and laser cavity.

Download Full-text