Picosecond CO/sub 2/ laser-induced self-defocusing in InSb
Creators
- 1. Dept. of Electrical and Computer Engineering, State Univ. of New York at Buffalo, Amherst, NY 14260
Description
Self-defocusing of 45 ps CO/sub 2/ laser pulses was observed in InSb at intensities as low as 1 MW/cm/sup 2/. This self-defocusing was caused by the two-photon absorption generated free carriers and the resulting self-phase modulation. In addition to demonstrating spatial beam modulation in this material at 10.6 μm, the present experiment also confirms directly that such a process occurs on a picosecond time scale. This information is important in order to increase the switching speed of infrared optical bistable devices to the picosecond regime. Furthermore, the present self-defocusing experiment also provided an accurate determination of the two-photon absorption coefficient in InSb. The value of 2.5 cm/MW obtained agrees exactly with a previous study. Other applications to continuum and ultrashort pulse generation are also discussed
Additional details
Publishing Information
- Journal Title
- IEEE J. Quantum Electron.
- Journal Volume
- QE-23
- Journal Issue
- 11
- Series
- IEEE J. Quantum Electron.
- Journal Page Range
- 1974-1980
- ISSN
- 0018-9197
- CODEN
- IEJQA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 19044200
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ABSORPTION; CARBON DIOXIDE LASERS; CHARGE CARRIERS; FOCUSING; INDIUM ALLOYS; INFRARED RADIATION; MATERIALS; MODULATION; OPERATION; OPTICAL PROPERTIES; PULSE GENERATORS; PULSE RISE TIME; PULSES; TIN ALLOYS
- Descriptors DEC
- ALLOYS; AMPLIFIERS; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; EQUIPMENT; FUNCTION GENERATORS; GAS LASERS; LASERS; PHYSICAL PROPERTIES; RADIATIONS; TIMING PROPERTIES