Abstract

A laser Doppler velocimeter (LDV) using a semiconductor laser diode (LD) with its self-mixing effect has been developed. A Doppler signal, caused by mixing a returned wave with an originally existing wave inside the LD, is detected with a photodetector in the LD package; it is also picked up from the variation of the LD driving voltage. When the returned light is weak enough, it confirms that there is no change in the single-mode oscillation and its spectral width of the LD. A LDV of this type is compact enough for many applications.

© 1986 Optical Society of America

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References

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  1. M. J. Rudd, “A Laser Doppler Velocimeter Employing the Laser as a Mixer-Oscillator,” J. Phys. E 1, 723 (1968).
    [CrossRef]
  2. J. H. Churnside, “Laser Doppler Velocimetry by Modulating a CO2 Laser with Backscattered Light,” Appl. Opt. 23, 61 (1984).
    [CrossRef] [PubMed]
  3. J. H. Churnside, “Signal-to-Noise in a Backscatter-Modulated Doppler Velocimeter,” Appl. Opt. 23, 2097 (1984).
    [CrossRef] [PubMed]
  4. Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
    [CrossRef]
  5. S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).
  6. M. Yoshikawa, N. Suzuki, T. Suzuki, “Coherence Characteristics of a Single-Mode GaAlAs Laser Diode,” J. Opt. Soc. Am. 71, 171 (1981).
    [CrossRef]

1984 (2)

1981 (1)

1976 (1)

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

1969 (1)

S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).

1968 (1)

M. J. Rudd, “A Laser Doppler Velocimeter Employing the Laser as a Mixer-Oscillator,” J. Phys. E 1, 723 (1968).
[CrossRef]

Churnside, J. H.

Kondo, H.

S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).

Mitsuhashi, Y.

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

Morikawa, T.

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

Murakami, H.

S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).

Nagano, S.

S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).

Rudd, M. J.

M. J. Rudd, “A Laser Doppler Velocimeter Employing the Laser as a Mixer-Oscillator,” J. Phys. E 1, 723 (1968).
[CrossRef]

Sakurai, K.

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

Seko, A.

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

Shimada, J.

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

Suzuki, N.

Suzuki, T.

Ueno, H.

S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).

Yoshikawa, M.

Appl. Opt. (2)

J. Opt. Soc. Am. (1)

J. Phys. E (1)

M. J. Rudd, “A Laser Doppler Velocimeter Employing the Laser as a Mixer-Oscillator,” J. Phys. E 1, 723 (1968).
[CrossRef]

Opt. Commun. (1)

Y. Mitsuhashi, T. Morikawa, K. Sakurai, A. Seko, J. Shimada, “Self-Coupled Optical Pickup,” Opt. Commun. 17, 95 (1976).
[CrossRef]

Trans. IECE Jpn. (1)

S. Nagano, H. Ueno, H. Kondo, H. Murakami, “Self Excited Microwave Mixer with a Gunn Diode and its Applications to Doppler Radar,” Trans. IECE Jpn. 52-B, 179 (1969).

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Figures (7)

Fig. 1
Fig. 1

Schematic configuration of the LDV: (a) Michelson interferometer type, (b) self-mixing type.

Fig. 2
Fig. 2

Experimental setup of the self-mixing type LDV.

Fig. 3
Fig. 3

Typical examples of Doppler signals displayed on the spectrum analyzer with a 10-kHz pass-bandwidth: (a) detected by PD, (b) picked up from the terminal output of the LD.

Fig. 4
Fig. 4

Variation of Doppler-shifted frequency fD with the angle θ, velocity of the moving object being constant. The broken line represents fD = 1.81 × 10−6 cos θ.

Fig. 5
Fig. 5

Measurement setup for the returned light intensity.

Fig. 6
Fig. 6

Relative intensity of returned light on the microlens vs distance Lt.

Fig. 7
Fig. 7

Doppler-signal level vs distance Lt.

Equations (3)

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f D = 2 υ cos θ / λ ,
I D ( t , l d ) = I D ( t , 0 ) exp ( l d / l c ) ,
Δ L ( dB ) = 20 log [ I D ( t , l d ) / I d ( t , 0 ) ] = 20 log ( e ) ( l d / l c ) .

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