C.W. modelocking of a GaInAsP diode laser

Glasser, L.A.

doi:10.1049/el:19780489

Cited by 58 publications

(6 citation statements)

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“…The most commonly used configurations are shown schematically in figure 14. Curved-mirror cavities, figure 14(a), were used in the first two successful demonstrations [9,170]. These have the disadvantage that the repetition rate is determined by the focal length of the mirror.…”

Section: Active Mode Lockingmentioning

confidence: 99%

Fast phenomena in semiconductor lasers

2000

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Although diode lasers are almost ideal sources for ultrahigh-speed data communication systems, system performance remains critically dependent on the quality of the optical pulses that they generate. Uniquely among lasers, the output power can be modulated directly by modulating the diode current. However, this leads to relaxation oscillations and a roll-off at high frequencies that is superimposed on the frequency response of the drive circuit. This is limited by parasitics and maximum modulation frequencies range from 1 to 70 GHz, depending on the type of laser and its packaging. The higher values are obtained with short cavity lengths and tight optical confinement, the highest frequencies being achieved in vertical-cavity devices. Modulation bandwidth is usually limited by circuit parasitics, device heating and the maximum power-handling capability of the laser facets.The generation of picosecond and femtosecond pulses demands special techniques and three-gain switching, Q-switching and mode locking-are discussed in detail, with their relative advantages and disadvantages compared. Very short pulses inherently contain a significant spread of wavelengths and their generation requires the optical gain in the laser medium to extend across that wavelength range. While diode lasers satisfy this criterion better than many other types, the effect of gain non-linearities and carrier-transport effects prevent the Fourier-transform limit from being achieved in practice. As a result, external pulse-compression techniques, which exploit the detailed temporal and spectral properties of the laser pulses, such as frequency chirping, self-phase modulation and group velocity dispersion, are becoming more important, and diode lasers are increasingly challenged as primary sources by compact, efficient, diode-pumped solid-state lasers.The paper summarizes the levels of maximum pulse power and minimum duration that have been achieved using the various techniques.

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Section: Active Mode Lockingmentioning

confidence: 99%

Fast phenomena in semiconductor lasers

2000

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“…Table 1 shows a summary of di.ode types mode-locked so far (Ho et al 1978b;Glasser 1978Glasser , 1979 and the pulse widths achieved. The shortest pulse width was 1G ps.…”

Section: Tue Experimental Resultsmentioning

confidence: 99%

Mode-locked laser systems: theoretical models

New

1980

Phil. Trans. R. Soc. Lond. A

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After a short review of the general methods of achieving mode-locked laser operation, the discussion concentrates on the case of passive mode-locking. Rate equation techniques applicable to both giant-pulse and quasi-continuous lasers are outlined. For the giant-pulse case, a sophisticated version of the ‘fluctuation model’ is described, which allows the stochastic features in the mode-locking performance to be examined quantitatively for the first time. Optimization procedures for these lasers are considered. For quasi-continuous lasers, the powerful compression mechanism that is responsible for the efficient generation of subpicosecond pulses in continuous wave (c.w.) dye lasers is described.

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“…To achieve pulses, several techniques have been developed. One of the oldest still used is employing a perforated metal disc (chopper wheel) rotating at high revolutions per minute (RPM) [3,4]; here, the period is defined by the chopper and the rotation speed. One more modern technique is Q-switching, which generates pulses through the modulation of losses in the cavity [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Novel Low-Cost Synchronous/Asynchronous Microcontroller-Based Pulsed Laser

et al. 2019

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The development and implementation of continuous-wave (CW) or pulsed lasers has become essential in all areas of science and engineering. In the case of pulsed lasers, their emission period is commonly set up by the length of the laser cavity, which implies that it is necessary to replace the whole laser or modify the cavity to change the repetition rate. On the other hand, microcontrollers, capable of performing specific tasks saving size, cost and power consumption, have proven to be a powerful tool for various applications. To the best of our knowledge, we present a novel pulsed laser based on a very low-cost commercial microcontroller and a continuous-wave laser diode, where the pulse width and period are adjustable through a graphical user interface (GUI); besides, a new temporal asynchronous regime consisting of periodic packets of multiple pulses is produced. Pulses from 8 to 60 ms duration and with periods from 0.25 to 5 s are presented. These long optical pulses can be useful in certain applications where conventional pulses cannot be used due to their inadequate pulse width or period or intensity, such as simulating the neuronal activity of the brain or the development of neuromorphic hardware, where the response times are in the order of ms.

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C.W. modelocking of a GaInAsP diode laser

Cited by 58 publications

References 1 publication

Fast phenomena in semiconductor lasers

Fast phenomena in semiconductor lasers

Mode-locked laser systems: theoretical models

A Novel Low-Cost Synchronous/Asynchronous Microcontroller-Based Pulsed Laser

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