IEE Proceedings - Optoelectronics
Volume 149, Issue 3, June 2002
Volumes & issues:
Volume 149, Issue 3
June 2002
-
- Author(s): Jean-Louis Coutaz
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, page: 81 –81
- DOI: 10.1049/ip-opt:20020595
- Type: Article
- + Show details - Hide details
-
p.
81
(1)
- Author(s): E. Peytavit ; G. Mouret ; J.F. Lampin ; S. Arscott ; P. Masselin ; L. Desplanque ; O. Vanbésien ; R. Bocquet ; F. Mollot ; D. Lippens
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 82 –87
- DOI: 10.1049/ip-opt:20020321
- Type: Article
- + Show details - Hide details
-
p.
82
–87
(6)
Electromagnetic generation between 0.1 and 3 terahertz has been demonstrated using ultrafast photodetectors loaded by broadband antennas and pumped by 0.8 µm stable lasers. Ultrashort response times have been achieved by means of low-temperature-grown (LTG) GaAs in a deep submicron interdigited technology. The 3 dB cutoff frequency is around 650 GHz with an expected output power of the order of a few tenths of a microwatt in the lower part of the spectrum, depending on the thermal post-processing conditions. Possible improvements via long wavelength laser pumping and a Fabry–Pérot cavity-like approach are discussed on the basis of a vertical device scheme. - Author(s): L. Chusseau ; G. Almuneau ; L.A. Coldren ; A. Huntington ; D. Gasquet
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 88 –92
- DOI: 10.1049/ip-opt:20020259
- Type: Article
- + Show details - Hide details
-
p.
88
–92
(5)
A coupled-cavity vertical-emitting semiconductor laser is built. It intrinsically allows the beating of two longitudinal modes owing to a weak coupling between the matched optical cavities. Terahertz electromagnetic waves have to be produced by external photomixing. First, analytical analysis enables design rules to be applied for such a purpose. Secondly, the fabrication and characterisation of a coupled-cavity VCSEL operating at 980 nm is described. The fabricated device shows a low laser threshold and exhibits the coupling between both cavities, although continuous-wave terahertz two-mode beating has not yet been observed. - Author(s): A. Zigler ; D. Hashimshony ; K. Papadopoulos
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 93 –97
- DOI: 10.1049/ip-opt:20020535
- Type: Article
- + Show details - Hide details
-
p.
93
–97
(5)
Tunable radiation in the range from 0.1 to a few THz by the interaction of a superluminous photoconducting front with an electrostatic ‘frozen wave’ configuration in a semiconductor is reported. The interaction converts the energy contained in the ‘frozen wave’ into THz radiation, whose frequency depends on the energy in the laser pulse creating the superluminous front and the wavelength of the static wave. Use of two-photon absorption leads to a volume interaction, creating a superluminous photoconducting front. Tunability was achieved by varying the laser pulse energy from 0.1 to 1 mJ. Power scaling as a function of the electrostatic ‘frozen wave’ energy was obtained. The capability of the concept to act as a narrow or wideband, tunable and powerful THz source is demonstrated. - Author(s): J.N. Hovenier ; R.W. van Es ; T.O. Klaassen ; W.T. Wenckebach ; F. Klappenberger ; M. Krätschmer ; S. Winnerl ; E. Schomburg ; G.M.H. Knippels ; A.F.G. van der Meer
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 99 –104
- DOI: 10.1049/ip-opt:20020260
- Type: Article
- + Show details - Hide details
-
p.
99
–104
(6)
The possibilities and restrictions for the use of the simple experimental method – differential electronic gating (DEG) – developed to determine the shape of repetitive subnanosecond THz pulses in the presence of a large jitter in the trigger signal are investigated. This method, a modification of the recently reported differential optical gating method, is based on subpicosecond electronic gating employing a high frequency sequential oscilloscope. As the ultimate test, the shape of 10 ps FWHM THz pulses from the free electron laser FELIX has been measured. - Author(s): S. Kono ; M. Tani ; K. Sakai
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 105 –109
- DOI: 10.1049/ip-opt:20020262
- Type: Article
- + Show details - Hide details
-
p.
105
–109
(5)
The shaker modulation technique is demonstrated for ultrabroadband detection of terahertz (THz) radiation with a low-temperature-grown GaAs photoconductive (PC) antenna gated with 15 fs laser pulses. The differentiation of the time-resolved waveforms with the shaker modulation is advantageous to enhance the high-frequency components of the detected radiation without degrading the signal-to-noise ratio (SNR) because the PC response function determined by the temporal profile of the gating carrier number rapidly decreases with the increase in frequency. With the quantitative comparison of SNR between PC and electro-optic detection, the PC detection of radiation with the shaker modulation technique is promising for further spectroscopic application. The detection of radiation up to 60 THz is demonstrated. - Author(s): A. Krotkus ; K. Bertulis ; M. Kaminska ; K. Korona ; A. Wolos ; J. Siegert ; S. Marcinkevičius ; J.-F. Roux ; J.-L. Coutaz
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 111 –115
- DOI: 10.1049/ip-opt:20020435
- Type: Article
- + Show details - Hide details
-
p.
111
–115
(5)
Structural, electrical and recombination properties of Be-doped low-temperature MBE grown (LTG) GaAs have been investigated by using a number of different experimental techniques. These properties were analysed with respect to the applications of LTG GaAs in ultrafast optoelectronic devices. It has been found that a moderate Be-doping improves the structural quality of the layers and does not affect their semi-insulating behaviour. Electron and hole capture cross-sections, critical parameters for the design of optoelectronic devices from LTG GaAs, equal to σn=1.1×10−13 and σp=1.8×10−15 cm2 were also determined. - Author(s): M. Herrmann ; M. Tani ; M. Watanabe ; K. Sakai
- Source: IEE Proceedings - Optoelectronics, Volume 149, Issue 3, p. 116 –120
- DOI: 10.1049/ip-opt:20020185
- Type: Article
- + Show details - Hide details
-
p.
116
–120
(5)
The use of terahertz radiation for detecting and imaging objects hidden in powders is demonstrated. Glass, eggshell and various plastics have been imaged in powders such as wheat flour, talc and sugar. The method may have applications in quality control. The images have been compiled by making use of various features of the terahertz time-domain waveforms. Details arising from refraction and interference close to the resolution limit are discussed. A simple method is suggested for distinguishing between objects of different materials even if their thickness is unknown. The potential of THz radiation for measuring the local density profile of powders is also demonstrated
Editorial: Ultrafast optoelectronics
Terahertz electromagnetic generation via optical frequency difference
Coupled-cavity vertical-emitting semiconductor laser for continuous-wave terahertz emission
Tunable, bandwidth controllable source of THz radiation
Sequential detection technique to measure the shape of short THz pulses in the presence of a large jitter in the trigger signal
Coherent detection of mid-infrared radiation up to 60 THz with an LT-GaAs photoconductive antenna
Be-doped low-temperature-grown GaAs material for optoelectronic switches
Terahertz imaging of objects in powders
Most viewed content for this Journal
Article
content/journals/ip-opt
Journal
5
Most cited content for this Journal
We currently have no most cited data available for this content.