We have demonstrated an all fiber, single-frequency 10 ns pulsed high energy and high peak power amplifier. It was capable of reaching 4.6 mJ pulse energy (460 kW peak power) and 2.3 mJ pulse energy (230 kW peak power) respectively for 10 ns pulses corresponding to the repetition rate of 5 kHz and 10 kHz. In the power amplifier stage, we used the large-mode-area fiber to avoid the nonlinear effects such as SBS.
A ytterbium-doped large mode area PCF sub-picosecond laser oscillator and amplifier system is experimentally studied. The oscillator which combines NPE and SESAM is operating on the all-normal-dispersion regime and the LMA PCF is used as the gain medium. In the CW mode-locking regime, the oscillator directly generates the pulse at the repetition rate of 83.7 MHz while the pulse duration is 960 fs. The double-clad fiber amplifier system directly generates a high average power of 12.53 W with a pulse duration of 4.1 ps corresponding to the pulse energy of 150 nJ and peak power of 36.6 KW after about 3 m ytterbium doped double clad fiber amplification.
We demonstrate a 10.5 W passively mode-locked Nd:YVO4 oscillator end-pumped by 808 nm laser diode. A novel resonator structure with large mode field space is introduced to solve thermal lens effect and semiconductor saturable absorber mirror’s (SESAM) damage, and then we achieve a single-beam-output picosecond pulse laser without inserting any other laser output elements in laser resonator. The repetition rate of mode-locked pulse is 63.4 MHz with 12.9 ps pulse width, corresponding to maximum pulse energy of 166 nJ and peak power of 12.9 kW. In addition, we discover a complete evolution process of pulses from Q-switched mode-locking to continuous wave (CW) mode-locking for the first time.
Diode pumped solid state 532 nm green laser is widely required for many industrial, medical and scientific applications.
Among most of these applications, high power quasi-continuous-wave (QCW) green laser output is demanded. This can
be efficiently achieved through a diode-side-pumped acoustic-optic Q-switched Nd:YAG laser with an intracavity second
harmonic generation (SHG). In our experiment, LBO crystal is used for the second harmonic generation of
high-average-power lasers of near infrared (NIR) range, though its effective NLO coefficient deff is relatively small. It is
because of its high damage threshold (greater than 2.5 GW/cm2), large acceptance angle, small walk-off angle, and the
nonhygroscopic characteristic. In this paper, we reported a high-repetition-rate high-power diode-side-pumped AO
Q-switched Nd:YAG 532 nm laser. A plane-plane cavity with two rods, two AO Q-switches and the type II critical
phase-matched LBO at room temperature were employed. Under the LD pump power of 480 W, 95.86 W at 1064 nm
wavelength was achieved when the repetition rate was 15 kHz, and the 532 nm average output power of 44.77 W was
obtained, with a pulse width of 111.7 ns, corresponding to an optical to optical conversion efficiency of 46.7% from 1064
nm to 532 nm. The 532 nm average output power was 40.10 W at a repetition rate of 10 kHz with a pulse width of 78.65
ns. The output characteristics of the SHG varying with the pumping current and the pulse repetition frequency (PRF) of
the laser were also investigated. Further improvement of the SHG is under study.
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