Excite-probe FEL (CLIO) study of two-photon-induced carrier dynamics in narrow gap semiconductors

doi:10.1016/0168-9002(94)90340-9

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 341, Issues 1–3, 1 March 1994, Pages 165-168

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Abstract

In a previous paper measurements were reported of two-photon absorption (TPA) in the narrow gap semiconductors InAs and InSb utilising the mid-infrared tunability of CLIO. An assumption had to be made concerning the lifetime of the excited carriers in order to interpret the results. We have now made a direct measurement of the lifetime of two-photon-induced free holes in InAs and InSb using an excite-probe technique. We have measured the TPA coefficient over the entire range from one-photon to two-photon threshold, showing good agreement with a non-parabolic band model for the process.

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Cited by (4)

Activities of the CLIO infrared facility
1996, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
The infrared CLIO FEL has operated as a user facility since mid-1992. About 2400 h of laser beam time are now produced annually, of which 800 h are dedicated to FEL physics and optimisation and 1600 h for laser users. The user beam time is allocated by a programme committee, the demands exceeding the available beam time by a large factor. CLIO spectral range spans 3 to 50 μm and its peak power is several MW in 0.2 to 5 ps long pulses. It is based on a dedicated radiofrequency linear accelerator. The repetition rate of the micropulses can be varied from 32 to 4 ns during 10 μs long macropulses (at up to 50 Hz) and average power up to a few Watt is achievable. Besides the laser facility, CLIO is used internally to study FEL physics. Several new studies have been successfully conducted at CLIO: ultrashort FEL pulses, 2-colors simultaneously generated, undulator step tapering, harmonic generation and self amplified spontaneous emission (SASE) at 5 μm. Several of these studies have resulted in the improvements of the user facility. The application of CLIO are in the following fields: - Semiconductors and quantum wells physics - Near field infrared microscopy - Vibrational energy transfers in molecules in rare gas matrices - Pump-probe study of vibrational relaxation of molecules - Surfaces and interfaces studies by sum frequency generation (“SFG”) - Medicine. Ancillary equipment is provided to the users. In particular optical parametric oscillators (“OPOs”) can provide powerful tunable infrared source between 2 and 8 μm to supplement CLIO.
Research with FELIX
1994, Nuclear Inst. and Methods in Physics Research, A
Nonlinear absorption in indium arsenide
1997, Physical Review B - Condensed Matter and Materials Physics
The CLIO infrared FEL facility
1996, Synchrotron Radiation News

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Excite-probe FEL (CLIO) study of two-photon-induced carrier dynamics in narrow gap semiconductors

Abstract

Opt. Mater.

Nucl. Instr. and Meth. A

Solid State Commun.

Opt. Lett.

J. Opt. Soc. Am. B

Opt. Eng.

IEEE J. Quantum Electron. QE-21

Appl. Phys. Lett.

Phys. Rev. B

Activities of the CLIO infrared facility

Research with FELIX

Nonlinear absorption in indium arsenide

The CLIO infrared FEL facility