The UK FEL project: Status and measurement of optical gain

C. R. Pidgeon; D. A. Jaroszynski; D Tratt; Desmond Smith; W J Firth; M. F. Kimmitt; C. W. Cheng; M. W. Poole; G. Saxon; R. P. Walker; J. S. Mackay; J. M. Reid; M. G. Kelliher; E. W. Laing; D. V. Land; W. A. Gillespie

The UK FEL project: Status and measurement of optical gain

C. R. Pidgeon, D. A. Jaroszynski, D Tratt, Desmond Smith, W J Firth, M. F. Kimmitt, C. W. Cheng, M. W. Poole, G. Saxon, R. P. Walker, J. S. Mackay, J. M. Reid, M. G. Kelliher, E. W. Laing, D. V. Land, W. A. Gillespie

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The aim of the UK FEL project is to study the characteristics of a single-pass FEL over a wide operating range, using a four-section 5 m wiggler yielding a maximum K value of 2.7. The laser is driven by the 165 MeV Kelvin Laboratory linac. It has a design operating wavelength range of 2-20 µm, although higher harmonics are also under investigation. We report direct measurement of optical gain using a cw CO₂ laser between 9 and 11 µm. Simultaneous spectra are obtained of both gain and spontaneous emission as a function of linac energy or wiggler field as the tuning parameter. The linewidth obtained is close to that expected for homogeneous broadening, and the gain is consistent with that predicted theoretically for the current available. Strong enhancement of both spontaneous emission and measured gain is obtained in the presence of a high-Q FEL cavity, as expected by simple considerations of optical confinement. These results imply that despite the shortness of our macropulse (~ 2.5 µm), it will be possible to diagnose buildup to oscillation from an injected signal. © 1987.

Original language	English
Pages (from-to)	31-37
Number of pages	7
Journal	Nuclear Inst. and Methods in Physics Research, A
Volume	259
Issue number	1-2
Publication status	Published - 1 Sept 1987

Cite this

@article{7fbc13c57617420f90fca0bc29232c7b,

title = "The UK FEL project: Status and measurement of optical gain",

abstract = "The aim of the UK FEL project is to study the characteristics of a single-pass FEL over a wide operating range, using a four-section 5 m wiggler yielding a maximum K value of 2.7. The laser is driven by the 165 MeV Kelvin Laboratory linac. It has a design operating wavelength range of 2-20 µm, although higher harmonics are also under investigation. We report direct measurement of optical gain using a cw CO2 laser between 9 and 11 µm. Simultaneous spectra are obtained of both gain and spontaneous emission as a function of linac energy or wiggler field as the tuning parameter. The linewidth obtained is close to that expected for homogeneous broadening, and the gain is consistent with that predicted theoretically for the current available. Strong enhancement of both spontaneous emission and measured gain is obtained in the presence of a high-Q FEL cavity, as expected by simple considerations of optical confinement. These results imply that despite the shortness of our macropulse (~ 2.5 µm), it will be possible to diagnose buildup to oscillation from an injected signal. {\textcopyright} 1987.",

author = "Pidgeon, {C. R.} and Jaroszynski, {D. A.} and D Tratt and Desmond Smith and Firth, {W J} and Kimmitt, {M. F.} and Cheng, {C. W.} and Poole, {M. W.} and G. Saxon and Walker, {R. P.} and Mackay, {J. S.} and Reid, {J. M.} and Kelliher, {M. G.} and Laing, {E. W.} and Land, {D. V.} and Gillespie, {W. A.}",

year = "1987",

month = sep,

day = "1",

language = "English",

volume = "259",

pages = "31--37",

journal = "Nuclear Inst. and Methods in Physics Research, A",

issn = "0168-9002",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - The UK FEL project

T2 - Status and measurement of optical gain

AU - Pidgeon, C. R.

AU - Jaroszynski, D. A.

AU - Tratt, D

AU - Smith, Desmond

AU - Firth, W J

AU - Kimmitt, M. F.

AU - Cheng, C. W.

AU - Poole, M. W.

AU - Saxon, G.

AU - Walker, R. P.

AU - Mackay, J. S.

AU - Reid, J. M.

AU - Kelliher, M. G.

AU - Laing, E. W.

AU - Land, D. V.

AU - Gillespie, W. A.

PY - 1987/9/1

Y1 - 1987/9/1

N2 - The aim of the UK FEL project is to study the characteristics of a single-pass FEL over a wide operating range, using a four-section 5 m wiggler yielding a maximum K value of 2.7. The laser is driven by the 165 MeV Kelvin Laboratory linac. It has a design operating wavelength range of 2-20 µm, although higher harmonics are also under investigation. We report direct measurement of optical gain using a cw CO2 laser between 9 and 11 µm. Simultaneous spectra are obtained of both gain and spontaneous emission as a function of linac energy or wiggler field as the tuning parameter. The linewidth obtained is close to that expected for homogeneous broadening, and the gain is consistent with that predicted theoretically for the current available. Strong enhancement of both spontaneous emission and measured gain is obtained in the presence of a high-Q FEL cavity, as expected by simple considerations of optical confinement. These results imply that despite the shortness of our macropulse (~ 2.5 µm), it will be possible to diagnose buildup to oscillation from an injected signal. © 1987.

AB - The aim of the UK FEL project is to study the characteristics of a single-pass FEL over a wide operating range, using a four-section 5 m wiggler yielding a maximum K value of 2.7. The laser is driven by the 165 MeV Kelvin Laboratory linac. It has a design operating wavelength range of 2-20 µm, although higher harmonics are also under investigation. We report direct measurement of optical gain using a cw CO2 laser between 9 and 11 µm. Simultaneous spectra are obtained of both gain and spontaneous emission as a function of linac energy or wiggler field as the tuning parameter. The linewidth obtained is close to that expected for homogeneous broadening, and the gain is consistent with that predicted theoretically for the current available. Strong enhancement of both spontaneous emission and measured gain is obtained in the presence of a high-Q FEL cavity, as expected by simple considerations of optical confinement. These results imply that despite the shortness of our macropulse (~ 2.5 µm), it will be possible to diagnose buildup to oscillation from an injected signal. © 1987.

UR - http://www.scopus.com/inward/record.url?scp=0023418549&partnerID=8YFLogxK

M3 - Article

SN - 0168-9002

VL - 259

SP - 31

EP - 37

JO - Nuclear Inst. and Methods in Physics Research, A

JF - Nuclear Inst. and Methods in Physics Research, A

IS - 1-2

ER -

The UK FEL project: Status and measurement of optical gain

Abstract

Other files and links

Fingerprint

Cite this