We report on an all–fiber polarization maintained (PM) erbium-based figure-9 structured nonlinear amplifying loop mirror mode-locked laser where a stable carrier-envelope offset frequency (fCEO) signal was detected via a fiber-packaged f-2f interferometer. At the pump power of 145 mW at 976 nm, the oscillator delivers an average output power of 6.13 mW with a repetition of 88.6 MHz and a signal-to-noise ratio of 79 dB. The spectrum of 3 dB bandwidth was measured to be 54.3 nm. Furthermore, an average power of 270 mW was obtained by a two-stage cascaded amplifier, corresponding to a single pulse energy of 3.05 nJ. Then, the lasing was injected into a 40-cm-long PM highly nonlinear fiber after optimizing the length of dispersion compensated PM single-mode fiber. At last, an fCEO beat note signal exceeding 34 dB was obtained, which implies the system can be potentially used in all–fiber optical frequency comb.
We report on a compact conductively cooled high-repetition-rate nanosecond Nd:YAG laser. The oscillator was an laser diode side-pumped electro-optical (EO) Q-switched Nd:YAG rod laser adopting unstable cavity with a variable reflectivity mirror. A pulse train of 142 mJ with duration of 10 ns, repetition rate of 80 Hz at 1064 nm has been achieved. Maximum pulse energy was obtained at the pump energy of 1380 mJ, corresponding to the optical–optical conversion efficiency of 10.3%. The peak power was deduced to be 14.2 MW. The near-field pattern demonstrated a nearly super Gaussian flat top profile. To our knowledge, this is the highest repetition rate operation for a conductively cooled EO Q-switched Nd:YAG rod laser.
Multilayer dielectric gratings (MDGs) are more and more used to compress pulse in the next generation
of chirped-pulse amplification (CPA) system for high-energy petawatt (HEPW)-class lasers due to their
high efficiency and high damage threshold for picosecond pulses. The damage tests for MDGs were
carried out with long pulse (12ns) in air and short pulse (0.66~9.7ps) in vacuum at 1053nm,
respectively. The experiment methodologies and results were discussed. For both long and short pulse,
the initial damage locates at the grating ridges opposite to the incoming wave, which is consistent with
the maximum normalized electric field intensity (NEFI). For long pulse, the damage is characterized by
melting and boiling. And for short pulse, the damage is ascribed to multiphoton-induced avalanche
ionization because of the electric field enhancement in the grating groove structure. And Measurement
results of the dependence of damage threshold on the pulse width are presented. And the damage
threshold of MDG in beam normal is 4.4J/cm2 at 70° incidence angle for 9.7ps pulse.
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