Abstract

A compact high-speed tuning laser source is demonstrated in two different configurations using a polygonal mirror scanner without a telescope. It is shown that the filter configuration finesse increases by utilizing multiple reflections from the polygon facet(s) and grating illumination(s). Theoretically, the free spectral range (FSR), the instantaneous linewidth, and the finesse of each filter configuration are derived. For single grating illumination, the measured coherence length, FSR, and power were 2.8mm, 184nm, and 40mW at the scanning frequency of 50kHz, respectively. Coherence length, FSR, and power of the second laser configuration were 6.2mm, 117nm, and 35mW, respectively. Finally, images of a human finger were acquired in vivo using two proposed swept-source configurations.

© 2008 Optical Society of America

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References

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  1. S. H. Yun, G. J. Tearney, J. F. de Boer, N. Iftimia, and B. E. Bouma, Opt. Express 11, 2953 (2003).
    [CrossRef] [PubMed]
  2. W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, Opt. Lett. 30, 3159 (2005).
    [CrossRef] [PubMed]
  3. R. Huber, M. Wojtkowski, and J. G. Fujimoto, Opt. Express 14, 3225 (2006).
    [CrossRef] [PubMed]
  4. W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, Photon. Technol. Lett. 17, 678 (2005).
    [CrossRef]
  5. S. H. Yun, C. Boudoux, G. J. Tearney, and B. E. Bouma, Opt. Lett. 28, 1981 (2003).
    [CrossRef] [PubMed]
  6. S. H. Yun, G. J. Tearney, J. F. de Boer, and B. E. Bouma, Opt. Express 12, 4822 (2004).
    [CrossRef] [PubMed]

2006 (1)

2005 (2)

W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, Photon. Technol. Lett. 17, 678 (2005).
[CrossRef]

W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, Opt. Lett. 30, 3159 (2005).
[CrossRef] [PubMed]

2004 (1)

2003 (2)

Boudoux, C.

Bouma, B. E.

de Boer, J. F.

Fujimoto, J. G.

Huber, R.

Iftimia, N.

Oh, W. Y.

W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, Photon. Technol. Lett. 17, 678 (2005).
[CrossRef]

W. Y. Oh, S. H. Yun, G. J. Tearney, and B. E. Bouma, Opt. Lett. 30, 3159 (2005).
[CrossRef] [PubMed]

Tearney, G. J.

Wojtkowski, M.

Yun, S. H.

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Figures (4)

Fig. 1
Fig. 1

(a) First and (b) second filter configurations.

Fig. 2
Fig. 2

(a) Finesse of several polygon filter designs with and without telescope(s) as a function of polygon facets. (b) Output spectra of the laser for the first and second filter configurations.

Fig. 3
Fig. 3

(a) Oscilloscope trace of the second configuration, showing five tuning cycles at a repetition rate of 50 kHz . (b) Point-spread functions obtained at 15 different depth points after mapping to linear space. The degradation in signal power with depth is no more than 6 dB over the total depth span of 6.2 mm .

Fig. 4
Fig. 4

Images of a human finger acquired with the OFDI system at 50 frames per second using proposed configurations.

Equations (6)

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F S R 1 = 2 p 1 Δ α cos α 0 ,
F S R 2 = p 1 Δ α ( cos α 0 + cos β 0 ) 1 ± p 1 cos ( β 0 ) 2 p 2 cos ( γ 0 ) ,
δ λ 1 = 2 2 ln 2 λ 0 p 1 cos α 0 π W ,
δ λ 2 = 2 ln 2 λ 0 p 1 cos α 0 π W ( 1 ± p 1 cos ( β 0 ) 2 p 2 cos ( γ 0 ) ) ,
F 1 = π W Δ α λ 0 2 ln 2 = 2 2 π 2 W N λ 0 ln 2 ,
F 2 = π W Δ α 2 λ 0 ln 2 ( 1 + cos β 0 cos α 0 ) = 2 π 2 N λ 0 ln 2 ( W + D ) ,

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