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A mode-locking mechanism by active gain modulation is studied numerically and experimentally. The parameter window for the emission of stable pulse trains was found. Pulses as short as 3 ps (~0.5 pJ) were characterized by second-order autocorrelation.
Experiments and simulation demonstrate an instability of the intracavity pumped optical parametric oscillator against bidirectional operation. It is shown that nonlinear losses inside the signal cavity can stabilize the bidirectional operation.
Efficient broadband spectrum oscillation was obtained directly from a laser-diode-pumped Kerr-lens mode-locked Yb:YAG laser with intracavity nonlinear media. The spectrum was expanded to around 1040 nm to 1070 nm. The spectrum is much broader than the fluorescence spectrum at 1050 nm.
31% DC to RF differential efficiency of the mode-locked laser's output electrical signal is reported for the first time. The external quantum efficiency of the saturable absorber and the operating regime are also analyzed.
Theoretical and experimental results are presented for the potential to eliminate group delay dispersion of resonant SESAMs over broad spectral bandwidths through the design of a single dielectric cap layer of carefully selected refractive index.
A detailed QD-SESAM growth study enabled the first modelocking of a VECSEL with similar spot size on gain and antiresonant SESAM. Antiresonant designs can strongly improve MIXSELs, a novel type of ultrafast integrated VECSELs.
Using tunnel junction patterning and double wafer fusion, we demonstrate phase-locked arrays of VCSELs emitting at the 1300 nm waveband. CW powers as high as 10 mW and coherent beams are demonstrated for various array configurations.
We model the phase coherence of multi-transverse modes of buried-heterostructure quantum cascade lasers. The experimentally observed transverse mode locking and beam steering are explained by four-wave mixing of longitudinal modes belonging to different transverse modes.
Microwave and optical frequency references are simultaneously transferred through fiber using a frequency-stabilized mode-locked Er-fiber laser comb. The instability for transferred microwave and optical frequencies are 2.0times10-13 and 7.5times10-15@1 s, respectively, for 3 km transmission.
A frequency comb is phase-locked to a CW laser with an electro-optic-modulator providing 1.6 MHz feedback bandwidth. Residual phase noise is as low as -94 dBc/Hz, and the comb remained locked under mechanical vibration of up to 1.9 g.
We report a pulsed fiber laser that generates 31-nJ chirped pulses at 70-MHz repetition rate and 2.2 W average power. After dechirping outside the cavity, 80-fs pulses, with 200-kW peak power, are obtained.
Phase to frequency conversion is demonstrated with a synchronously modelocked optical parametric oscillator, with a sensitivity of 16 MHz/radian, and a phase resolution of 9ldr10-8 radian.
We present a tunable, frequency-stabilized, narrow-bandwidth source of frequency-degenerate, entangled photon pairs, which can address the two D-P transitions in 40Ca+ ions. We also demonstrate single ion-single photon interaction by the detection of quantum jumps.
The carrier-envelope phase dynamics of octave-spanning Ti:sapphire lasers are analyzed based on a one-dimensional laser. It is found that self-steepening is the major contributor to the energy dependent carrier-envelope phase and that center-frequency-shifts are negligible.
471-fs pulses are generated by injecting a 33-ps pulse train, obtained from pulse carving a 1.55-mum CW DFB laser, into a time-lens loop. High repetition rate of 1.1 GHz is demonstrated.
We locked a laser to a cavity using an all-digital Pound-Drever-Hall feedback system. By performing the demodulation and feedback controller digitally the low frequency noise performance was improved compared to a conventional analog system.
We have developed a normal-dispersion passively mode-locked ytterbium-doped fiber laser with a fundamental repetition rate higher than 400 MHz at a wavelength of ~1085 nm by use of a short linear cavity design.
126 mW visible light were generated by frequency doubling using bulk PPLN in a high finesse ring cavity pumped by a BAL ECDL. The locking between the two cavities is managed purely optical.
We present a compact, passively mode-locked and prismless Nd:phosphate laser, pumped by a single-mode, low-power (150-mW) laser diode. We obtained self-starting 270-fs near transform-limited pulses, employing a single Gires-Tournois mirror for intracavity dispersion compensation.
Passive synchronization is demonstrated between the self-similar Yb-fiber and the stretched-pulse Er-fiber mode-locked lasers. The pulse repetition rates of the two mode-locked lasers can keep locked when multiple-pulse bound states or periodic pulse collisions occur.
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