Wavelength-Tunable Laser-Diode Interferometer

• ISHII Yukihiro

  Department of Electronics, University of Industrial Technology, Sagamihara, 4–1–1, Hashimotodai, Sagamihara, 229–1196 Japan

抄録

Laser diodes (LDs) have been applied to a phase-measuring interferometer through the wavelength tunability of LDs by controlling their currents. Laser-diode interferometers based on a heterodyne technique are reviewed. A two-wavelength laser-diode interferometer is demonstrated with current control of dual LDs in opposite directions. A synthetic wavelength makes it possible to extend the range of interferometric measurements. The wavelength is controlled by the laser injection current and is stepwise or rampwise changed to introduce a time-varying phase difference between the two beams of an interferometer with unbalanced optical path lengths. The optical output is demodulated with a phase-extraction algorithm. Systematic phase errors caused by the LD-power variation and by the difference between the beat frequency and ramp frequency are analyzed. A feedback interferometer with electronics is used to eliminate the phase error by locking the interferometer on a preset phase. Typical experimental results are shown.

収録刊行物

• Optical Review

  Optical Review 6 (4), 273-283, 1999

  公益社団法人 応用物理学会分科会 日本光学会

キーワード

• laser diode
• wavelength tunability
• phase measurement
• phase-shifting method
• heterodyne interferometer
• feedback control
• two-wavelength interferometer
• systematic phase errors

詳細情報

• CRID: 1390001205527101440
• NII論文ID: 130006950307
• NII論文ID: 30016401301
• DOI: 10.1007/s10043-999-0273-3
• BIBCODE: 1999OptRv...6..273I
• ISSN: 13499432
• ISSN: 13406000
• Web Site: http://link.springer.com/content/pdf/10.1007/s10043-999-0273-3.pdf
• Web Site: http://link.springer.com/article/10.1007/s10043-999-0273-3/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1007/s10043-999-0273-3
• 本文言語コード: en
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