Analysis of intrapulse chirp in CO2 oscillators
Abstract
Pulsed singlefrequency CO2 laser oscillators are often used as transmitters for coherent lidar applications. These oscillators suffer from intrapulse chirp, or dynamic frequency shifting. If excessive, such chirp can limit the signaltonoise ratio of the lidar (by generating excess bandwidth), or limit the velocity resolution if the lidar is of the Doppler type. This paper describes a detailed numerical model that considers all known sources of intrapulse chirp. Some typical predictions of the model are shown, and simple design rules to minimize chirp are proposed.
 Publication:

ClosedCycle, FrequencyStable CO2 Laser Technology
 Pub Date:
 April 1987
 Bibcode:
 1987ccfs.nasa...47M
 Keywords:

 Carbon Dioxide Lasers;
 Chirp;
 Electromagnetic Interference;
 Oscillators;
 Doppler Radar;
 Mathematical Models;
 Optical Radar;
 Pulsed Lasers;
 Signal To Noise Ratios;
 Lasers and Masers