Results: 3

1.
Fig. 2.

Fig. 2. From: Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere.

Schematic of the experimental apparatus.

V. Kocharovsky, et al. Proc Natl Acad Sci U S A. 2005 May 31;102(22):7806-7811.
2.
Fig. 1.

Fig. 1. From: Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere.

SOS spectroscopy. Multiple pairs of pulses are generated such that the spacing between pulses in each pair is decreasing. The second pulse in each pair has a higher velocity because of atmospheric dispersion. The first pair of pulses overlaps near the back of the cloud, creating a small region of gain. Subsequent pairs overlap at closer and closer regions of the cloud, producing a swept-gain amplifier that lases back toward the observer. We suggest two schemes: one in which blue and UV pulses are sent toward the cloud, causing lasing on an IR vibrational transition, and the other in which IR and UV pulses are sent toward the cloud, causing lasing on a blue electronic transition (such as the example shown in phosgene).

V. Kocharovsky, et al. Proc Natl Acad Sci U S A. 2005 May 31;102(22):7806-7811.
3.
Fig. 3.

Fig. 3. From: Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere.

Snapshots of the generated pulse at different positions in the cloud: at the far edge of the cloud where the pulse experiences linear amplification (a); in the middle of the cloud where the superfluorescent pulse is formed (b); and at the near edge of the cloud where the superradiant pulse is formed, where one can see that the time scale of the ringing is smaller than T2 (c). Parameters used in the simulation are: , N = 1014 cm–3, and T2 = 10–9 s. Our estimate is that by using 60 laser pulses to transfer population to the excited vibrational state to create population inversion, one photon of spontaneous radiation at the far edge of the cloud will be amplified to 1016 photons leaving the near edge.

V. Kocharovsky, et al. Proc Natl Acad Sci U S A. 2005 May 31;102(22):7806-7811.

Supplemental Content

Recent activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...
Write to the Help Desk