Round-trip gain

Round-trip gain refers to the laser physics, and laser cavities (or laser resonators). It is gain, integrated along a ray, which makes a round-trip in the cavity.

At the continuous-wave operation, the round-trip gain exactly compensates both the output coupling of the cavity and its background loss.

Round-trip gain in geometric optics

Generally, the Round-trip gain may depend on the frequency, on the position and tilt of the ray, and even on the polarization of light. Usually, we may assume that at some moment of time, at reasonable frequency of operation, the gain is function of the Cartesian coordinates , , and . Then, assuming that the geometrical optics is applicable the round-trip gain can be expressed as follows:

where is path along the ray, parametrized with functions , , ; the integration is performed along the whole ray, which is supposed to form the closed loop.

In simple models, the flat-top distribution of pump and gain is assumed to be constant. In the case of simplest cavity, the round-trip gain , where is length of the cavity; the laser light is supposed to go forward and back, this leads to the coefficient 2 in the estimate.

Round trip

Round trip may refer to:

Recordings

Round Trip (The Knack album)

Round Trip is an album by power pop/new wave band The Knack that was released by Capitol Records in 1981. It received generally unfavorable critical reviews, but it reached #93 in the Billboard 200 and also contained single "Pay The Devil (Ooo, Baby, Ooo)" (hitting #67 on the Billboard Hot 100). "Boys Go Crazy" was issued as the single from the album in Australia. It was also issued as a follow up single to "Pay the Devil" in the U.S. and was expected to be "chart bound" on the Hot 100, but it did not chart. The band broke up a few weeks after its release, with their label dropping them due to failed expectations. They remained disbanded until a 1986 reunion.

Overview and reviews

Round Trip was their third album, and it was produced by Jack Douglas. The album was generally critically panned at the time of its release, however, some critics have subsequently been more positive. Steve "Spaz" Schnee of Allmusic called it "brilliant" and stated that it was better than the previous two albums. Darren Robbins of the pop culture review website The Zeitgeisty Report has called the album a "masterpiece" and "possibly the most underrated album of all-time".

Round Trip (The Gap Band album)

Round Trip is the 12th album by The Gap Band, released in November 14, 1989 on the Capitol Records/EMI Records. The album includes the number one hit single on the American R&B chart "All of My Love" and the single "Addicted to Your Love".

Track listing

References

External links