We report on the accurate measurement of nonlinear ellipse rotation (NER) by means of a phase-sensitive method employing a dual-phase lock-in. The magnitudes and signs of pure refractive electronic nonlinearities of silica and BK7 were determined with this new method using 150 femtosecond (fs) laser pulses at 775 nm. Experimental and theoretical analyses of the NER signal were carried out and t...

The bandwidth and performance of optical phase-lock loops (OPLLs) using single-section semiconductor lasers (SCLs) are severely limited by the nonuniform frequency modulation response of the lasers. It is demonstrated that this restriction is eliminated by the sideband locking of a single-section distributed-feedback SCL to a master laser in a heterodyne OPLL, thus enabling a delay-limited loop...

Phase locked loop (PLL) is a control system that generates a signal having a fixed relation with the phase of a reference signal. This system responds to both frequency and phase of the input signals, automatically raising or lowering the frequency of a controlled oscillator until it is matched to the reference in both frequency and phase. The performance of PLL is primarily dependent on the lo...

–Missile borne Monopulse receivers invariably track the target in three domains, namely frequency, range and angle. For effective jamming of these receivers, it is essential that breaking of the track should be achieved in at least two domains. In frequency domain, so long as the monopulse receiver locks onto the radar echo frequency, the radar tracks the target. When there is a disturbance int...

In this paper, we discuss a new approach to multi-version concur-rency control, called Dynamic Versioning, that avoids the data contention due to connicts between Reads and Writes. A data item is allowed to have several committed versions and at most one uncom-mitted version. A connict between a Read and a Write is resolved by imposing an order between the requesting transactions, and allowing ...

Time-dependent coupled mode theory is used to investigate the stability of phase-locked semiconductor laser arrays. The output of individual array elements is dynamically unstable and exhibits large amplitude chaotic pulsations. The total output initially exhibits damped relaxation oscillations and then settles down. to a quasi-steady state characterized by small amplitude fluctuations. The the...

Offset locking is a popular method for stabilizing laser frequency, which crucial to many physics experiments. Wide range offset locks are desirable, as they increase the span of usable frequencies in an experiment. Here, we experimentally realize wide-range lock using beat-note setup combined with electro-optic phase modulation. By frequency down-conversion beat note and sidebands generated by...