Ultrabroadband radiation from at ambient and low air pressures was investigated under the excitation of a diode laser. The radiation was confirmed to be blackbody radiation, and it is sensitive to environmental air pressure in the way that the integrated radiation intensity decreases linearly with increasing air pressure. An ideal gas model may be employed to interpret the linear dependence. The pressure-sensitive radiation characteristic provides a potential method for noncontact measurement of air pressure with high accuracy.
© 2011 Optical Society of AmericaFull Article | PDF Article