Abstract

The use of a tilted solid etalon inside the resonator of a gas laser, for the purpose of obtaining a tunable single mode output from the laser, is described and analyzed. This technique is illustrated by single mode spectra and gain profiles obtained with various argon ion laser transitions.

© 1969 Optical Society of America

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References

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  1. P. W. Smith, IEEE J. Quantum Electron. QE-1, 343 (1965).
    [CrossRef]
  2. D. C. Sinclair, Appl. Phys. Lett. 13, 98 (1968).
    [CrossRef]
  3. J. M. Forsyth, Appl. Phys. Lett. 11, 391 (1967).
    [CrossRef]
  4. D. C. Sinclair, Spectra Physics, Mountain View, Calif., private communication.

1968

D. C. Sinclair, Appl. Phys. Lett. 13, 98 (1968).
[CrossRef]

1967

J. M. Forsyth, Appl. Phys. Lett. 11, 391 (1967).
[CrossRef]

1965

P. W. Smith, IEEE J. Quantum Electron. QE-1, 343 (1965).
[CrossRef]

Forsyth, J. M.

J. M. Forsyth, Appl. Phys. Lett. 11, 391 (1967).
[CrossRef]

Sinclair, D. C.

D. C. Sinclair, Appl. Phys. Lett. 13, 98 (1968).
[CrossRef]

D. C. Sinclair, Spectra Physics, Mountain View, Calif., private communication.

Smith, P. W.

P. W. Smith, IEEE J. Quantum Electron. QE-1, 343 (1965).
[CrossRef]

Appl. Phys. Lett.

D. C. Sinclair, Appl. Phys. Lett. 13, 98 (1968).
[CrossRef]

J. M. Forsyth, Appl. Phys. Lett. 11, 391 (1967).
[CrossRef]

IEEE J. Quantum Electron.

P. W. Smith, IEEE J. Quantum Electron. QE-1, 343 (1965).
[CrossRef]

Other

D. C. Sinclair, Spectra Physics, Mountain View, Calif., private communication.

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Figures (4)

Fig. 1
Fig. 1

Geometry of a tilted etalon. The end surfaces may have a reflective coating or may utilize the reflection from the uncoated dielectric–air interface.

Fig. 2
Fig. 2

(a) Theoretical plot of the transmission of a tilted etalon as a function of tilt angle for light of constant wavelength. The etalon has a refractive index of 1.6 and is 2 cm long. Curves for reflectivities of 0.05 (uncoated) and 0.20 are shown. (b) Tuning curve for an etalon whose refractive index is 1.45, in the vicinity of 5000 Å. The solid line shows the shift in etalon resonance as a function of tilt angle.

Fig. 3
Fig. 3

Free-running and single mode spectra obtained at 4880 Å with an argon ion laser: (a) free-running spectrum; effects of Zeeman splitting are clearly observable; (c) spectrum from same laser after intracavity insertion of a 1.5-cm tilted etalon (glass; n ∼ 1.52); (c) single mode gain profile obtained by varying the tilt of the etalon and recording successive single mode outputs using a Tektronix 549 storage scope (note that the width of the gain profile exceeds the free spectral range of the optical spectrum analyzer used to record the spectra and is ∼7 GHz); (d) single mode gain profile obtained with a 2.5-cm etalon. (Same vertical scale for all pictures.)

Fig. 4
Fig. 4

Free-running and single mode argon ion laser spectra at 5145 Å and 4765 Å. The vertical scales in each column of spectra are constant. Note that in the gain profiles, adjacent axial modes (separation ∼75 MHz) are successively selected by the tilted etalon, but that in the wings of the profiles, alternate axial modes are selected.

Equations (7)

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2 n d ( 1 θ 2 / 2 n 2 ) = m ( λ 0 Δ λ ) ,
Δ λ = λ θ 2 / 2 n 2 , or Δ ν = ν θ 2 / 2 n 2 .
Δ ν FSR = c / 2 n d .
T [ 1 + ( 2 F / π ) 2 sin 2 2 π n d cos ( θ / n ) λ ] 1 ,
F R = π R 1 2 / ( 1 R ) .
Δ ν c = ν c [ d θ 2 ( n 1 ) 2 n L ] .
l = loss / transit 4 d θ R / n D ;

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