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  • LASERS AND MASERS  (2)
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  • 1
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    DBR laser with nondynamic plasma grating formed by focused ion beam implanted dopants (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A static plasma grating has been demonstrated experimentally (Wu et al., 1988) in a large-optical-cavity focused-ion-beam-distributed-Bragg-reflector (FIB-DBR) GaAlAs/GaAs laser diode. The grating is formed by implanting stripes of dopants with a focused ion beam. The dopants ionize to form periodic fluctuations in the carrier concentration which, through the Kramers-Kronig relations, form an index grating. A model of the grating strength for optimizaton of the laser design is developed and presented. The computed results show that the coupling coefficient k can be increased by more than an order of magnitude over the 15/cm experimentally. Therefore, FIB-DBR or FIB-distributed-feedback (DFB) lasers with performance comparable to that of conventional DBR (or DFB) lasers can be expected.
    Keywords: LASERS AND MASERS
    Type: IEEE Journal of Quantum Electronics (ISSN 0018-9197); 25; 1294-130
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    GaAs/GaAlAs distributed Bragg reflector laser with a focused ion beam, low dose dopant implanted grating (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The performance of a GaAs/GaAlAs distributed Bragg reflector (DBR) laser using a focused ion beam implanted grating (FIB-DBR) is reported for the first time. Stripes of Si(2+) with a period of 2300 A and a dose about 10 to the 14th/sq cm are directly implanted into the passive large optical cavity layer to provide the distributed feedback. Surface-emitting light from the second-order grating is observed. Threshold current of 110 mA and single DBR mode operation from 20 to 40 C are obtained. The wavelength tuning rate with temperature is 0.8 A/C. The coupling coefficient is estimated to be 15/cm. The results show that FIB technology is practical for distributed feedback and DBR lasers and optoelectronic integrated circuits.
    Keywords: LASERS AND MASERS
    Type: Applied Physics Letters (ISSN 0003-6951); 53; 265-267
    Format: text
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    NASA TECHNICAL REPORTS
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