A gain-switched quantum cascade (QC) laser is developed to generate pulses with less than 200 psec duration at 8 μm. Gain switching is a technique for the generation of picosecond light pulses from injection layers, which relies on the rapid depletion of the gain-medium population inversion following a short-lived electrical excitation. The QC laser is gain-switched with a commercial `comb' generator consisting of a step recovery diode and filtering reactive elements. When driven at half a watt of radio frequency power, this device generates a train of short negative electrical pulses, each with a duration of approximately 140 psec, and an amplitude of more than 20 V across a 50 Ω load; the repetition rate is set by a 100 MHz driving frequency.
|Original language||English (US)|
|Number of pages||2|
|Journal||Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS|
|State||Published - Dec 1 1999|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering