Dispersive self-Q-switching in self-pulsating DFB lasers
| Autor: | S. Reichenbacher, Uwe Bandelow, Bernd Sartorius, M. Mohrle, Hans-Jürgen Wünsche, H. Preier |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: |
Imagination
self-pulsating dfb lasers Materials science clocks laser frequency stability media_common.quotation_subject distributed feedback sections Reflector (antenna) semiconductor lasers dispersive self-q-switching laser variables measurement two-section dfb lasers Semiconductor laser theory law.invention operating conditions Optics semiconductor device models law electronic wavelength tuning Dispersion (optics) semiconductor device testing Astrophysics::Solar and Stellar Astrophysics optical clocks Electrical and Electronic Engineering laser modes high-frequency self-pulsations media_common business.industry distributed feedback lasers single-mode type bragg wavelengths current-induced heating q-switching Condensed Matter Physics Laser Q-switching Atomic and Molecular Physics and Optics Wavelength laser theory additional phase tuning section transparency current density Optoelectronics dispersive self-q-switching mechanism critical detuning electrical phase-control section business Current density laser tuning |
| Popis: | Self-pulsations reproducibly achieved in newly developed lasers with two distributed feedback sections and with an additional phase tuning section are investigated. The existence of the dispersive self-Q-switching mechanism for generating the high-frequency self-pulsations is verified experimentally for the first time. This effect is clearly distinguished from other possible self-pulsation mechanisms by detecting the single-mode type of the self-pulsation and the operation of one section near the transparency current density using it as a reflector with dispersive feedback. The operating conditions for generating this self-pulsation type are analyzed. It is revealed that the required critical detuning of the Bragg wavelengths of the two DFB sections is achieved by a combination of electronic wavelength tuning and current-induced heating. The previous reproducibility problems of self-pulsations in two-section DFB lasers operated at, in principle, suited current conditions are discussed, and the essential role of an electrical phase-control section for achieving reproducible device properties is pointed out. Furthermore, it is demonstrated that phase tuning can be used for extending the self-pulsation regime and for optimizing the frequency stability of the self-pulsation. Improved performance of the devices applied as optical clocks thus can be expected. |
| Databáze: | OpenAIRE |
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