600 mW CW single-mode GaAlAs triple-quantum-well laser with a new index guided structure

Imafuji, Osamu; Takayama, Toru; Suguira, H.; Yuri, Masaaki; Naito, Hiroshi; Kume, M.; Itoh, Kunio

doi:10.1109/3.234450

Cited by 46 publications

(5 citation statements)

References 10 publications

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“…Therefore, due to the finite time of the intraband relaxation, the maximum energy emitted during It is quite obvious that the pulse energy and peak power in the real experiments should be smaller than these maximum values. Note that high power semiconductor lasers with similar geometry and material parameters typically generate powers of around 1 W [30,31].…”

Section: Peak Power and Energy Of Pulsesmentioning

confidence: 99%

Femtosecond superradiant emission in inorganic semiconductors

Vasil'ev

2009

Rep. Prog. Phys.

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A review of an experimental study of superradiance in semiconductor inorganic structures is presented. It is demonstrated that unique properties of superradiant emission are determined by unusual properties of electrons and holes, namely, the formation of BCS-like state in a system of collectively paired electrons and holes. This can adequately explain all features of superradiance, including its femtosecond pulse duration, record peak power, optical spectrum, spatial and temporal coherency and macroscopically large fluctuations. The effect of non-equilibrium condensation of electrons and holes in the phase domain at room temperature is experimentally demonstrated. The critical temperature of condensation in a strongly degenerate system of electrons and holes is finally theoretically estimated. 4.8. Non-equilibrium condensation of the electrons and holes 12 5. Hypothesis: quasi-stable BCS-like electron-hole state 13 6. Mechanism of metastability of the quasi-equilibrium collective state 14 7. Optical spectra fitting. Parameters of the coherent state 16 8. Mechanism of the formation of the condensate 17 9. Low energy level of the collectively paired e-h pairs 17 10. Critical temperature of condensation in highly degenerate e-h system in the presence of resonant electromagnetic field 18 11. SR of excitonic condensates 20 12. Conclusions 20 Acknowledgment 21 References 22

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Section: Peak Power and Energy Of Pulsesmentioning

confidence: 99%

Femtosecond superradiant emission in inorganic semiconductors

Vasil'ev

2009

Rep. Prog. Phys.

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“…It is obvious that experimentally obtained pulse energies and peak powers must be smaller than this maximum value. For comparison, let us note that typical values of the peak power in experiments with similar semiconductor structures were measured to be 0.3 W [14] or 0.6 W [15]. As mentioned above in Section 2, we have experimental values of E p in a range of 30-40 pJ and peak powers of above 100 W, which are by 30-40 time larger.…”

mentioning

confidence: 74%

Conditions and possible mechanism of condensation of e–h pairs in bulk GaAs at room temperature

Vasil'ev

2004

Physica Status Solidi (b)

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A mechanism of the condensation of e-h pairs in bulk GaAs at room temperature, which has been observed earlier, is proposed.The point is that the photon assisted pairing happens in a system of electrons and holes that occupy energy levels at the very bottoms of the bands. Due to a very high e-h density, the destruction of the pairs and loss of coherency does not occur because almost all energy levels inside a 30-60 meV band from the bottom of the conduction band prove to be occupied. As a result, a coherent ensemble of composite bosons (paired electrons and holes) with the minimum possible energy appears. The lifetime of this strongly non-equilibrium coherent e-h BCS-like state is as short as a few hundred of femtoseconds.

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“…The LDH unit utilizes the spot size detection (SSD) method as a focusing servo system, and the usual three beam method as a tracking servo system, as shown in Figs. 4 and 5, respectively. The optical operation of the LDH unit is as follows.…”

Section: Basic Structurementioning

confidence: 97%

“…Our LDH unit uses the new FUSA laser [4] chip, which exhibits low operating current and low noise characteristics. The characteristics of light output power versus injection current of the RISA laser are shown in Fig.…”

Section: Laser and Optical Pick-up Head Characteristicsmentioning

confidence: 99%

Laser-detector-hologram unit for thin optical pick-up head of a CD player

Yoshikawa¹,

Nakanishi²,

Itoh³

et al. 1995

IEEE Trans. Comp., Packag., Manufact. Technol. B

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A laser-detector-hologram (LDH) unit having the size of 4.8 x 8.2 x 4.3 mm for use as a thin optical pick-up head of a CD player has been successfully developed. The technology to make the LDH unit thin and small is based upon the following techniques: 1) an efficient optical combination of a low operating current laser diode and a 45" built-in micromirror which is formed on a Si photodetector substrate, 2) a thin plastic-molded flat package With good thermal dissipation, and 3) a plasticmolded holographic optical element (HOE) as a cap. The pick-up head with the LDH unit has shown good optical performance, which is sufficient for the application to CD players.

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600 mW CW single-mode GaAlAs triple-quantum-well laser with a new index guided structure

Cited by 46 publications

References 10 publications

Femtosecond superradiant emission in inorganic semiconductors

Femtosecond superradiant emission in inorganic semiconductors

Conditions and possible mechanism of condensation of e–h pairs in bulk GaAs at room temperature

Laser-detector-hologram unit for thin optical pick-up head of a CD player

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