Master Oscillator Techniques for 10micron Radar.

摘要

A CO2waveguide laser was coupling-modulated with the help of an intractivity electro-optic polarization switch. Linear FM-modulation was achieved by sweeping the drive frequency from 100to 500MHz in linear fashion. The optical beam coupled from the resonator represented a suppressed-carrier-double-sideband-modulated. signal. The sidebands are chirped in opposite spectral directions as the modulation is swept through the chirp range. By placing the optical carrier in the wing of the P(20) gain profile,only one sideband chirps through the range of interest,the other falls outside the gain profile. This experiment represents a further important step towards the contract goal to obtain fast linear FM-modulation centered on the P(20) line profile. A second important result obtained during the reporting period is the design,construction and testing of a sealed-off CO2waveguide laser which is to yield the required frequency stability.