An interferometric method of laser beam analysis

Liesenhoff, A.; Rühl, F.

doi:10.1063/1.1145417

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…There are several ideas and methods for a modal analysis of partially coherent beams. [5][6][7][8][9] For fully coherent beams, which are considered here, other methods were developed that use spatial filters 10 or the measurement of the transverse intensity distribution along the beam axis. 11 We have developed a so-called diagnostic breadboard to characterize the beam quality of single-frequency continuous wave ͑cw͒ lasers by performing a high resolution modal analysis of the fully coherent test beam.…”

Section: Introductionmentioning

confidence: 99%

Laser beam quality and pointing measurement with an optical resonator

Kwee

Seifert

Willke

et al. 2007

Review of Scientific Instruments

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We present a compact diagnostic breadboard that is based on an optical ring resonator for measuring beam quality and pointing of single-frequency continuous wave lasers at a wavelength of 1064 nm. To determine the beam quality of the coherent test beam, this optical resonator is used to perform a mode decomposition into Hermite-Gaussian modes. For our laser system, a power fraction in the fundamental Gaussian mode of 97.2% ± 0.2% was measured. Residual misalignment and mis-mode-matching to the resonator as well as the astigmatism and/or ellipticity of the test beam have been determined. Numerical simulations showed that measurements of the M 2 factor and transversal intensity distribution are not suitable for determining this power fraction. To measure the beam pointing, the fundamental mode of the optical resonator was used as a stable reference. The pointing of the test beam was measured with the differential wave front sensing technique up to Fourier frequencies of 1 kHz with a sensitivity to relative pointing of ͉⑀͉ =1ϫ 10 −6 / ͱ Hz. Pointing measurements with an alternative method were performed and showed good agreement.

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Section: Introductionmentioning

confidence: 99%

Laser beam quality and pointing measurement with an optical resonator

Kwee

Seifert

Willke

et al. 2007

Review of Scientific Instruments

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show abstract

“…Various methods have been proposed for determining the weights of a laser's spatial modes including curve fitting, 5 matrix inversion, 6,7 M 2 analysis, 8 frequency mixing, 9 and coherence measurements. 10 -12 All these methods assumed the Hermite-Gaussian form of the spatial modes.…”

Section: Introductionmentioning

confidence: 99%

Determining spatial modes of lasers with spatial coherence measurements

2000

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We explain a technique that extracts both the structure and the modal weights of spatial modes of lasers by analyzing the spatial coherence of the beam. This is the first time, to our knowledge, that an experimental method is being used to measure arbitrary forms of the spatial modes. We applied this method to an edge-emitting Fabry-Perot semiconductor laser with a stripe width of 5 mum and extracted fundamental and first-order lateral modes with relative power weights of 96.2% and 3.8%. There was a single transverse mode.

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Section: Introductionmentioning

confidence: 99%

Ohio State University Cooperative Research and Development Agreement (CRDA). Crystal Growth by Molecular Beam Epitaxy (MBE) and Characterization of Optoelectronic Devices

Siskaninetz¹

2003

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2 ABSTRACT (Maximum 200 Words)This is the final report for the Ohio State University CRDA, Project Number CRDE9501. The objective of this research project was two-fold: (1) develop improved knowledge regarding (but not limited to) Molecular Beam Epitaxy (MBE) Crystal Growth and Characterization for application to optoelectronic and other devices; (2) make available government facilities and expertise to help the OSU Research Foundation perform research and testing requested by industrial firms and other governmental organizations. The CRDA resulted in the development of spatial mode characterization techniques for semiconductor lasers. The CRDA provided an avenue to supply the OSU Research Foundation with inhouse developed ridge waveguide semiconductor lasers and in return provided verification of in-house developed models used to design the laser devices as well as fabrication verification. SUBJECT TERMS Project SynopsisThis is the final report for the "Ohio State University CRDA, Project Number CRDE9501. The objective of this research project was two-fold: (1) develop improved knowledge regarding (but not limited to) Molecular Beam Epitaxy (MBE) Crystal Growth and Characterization for application to optoelectronic and other devices; (2) make available government facilities and expertise to help the OSU Research Foundation perform research and testing requested by industrial firms and other governmental organizations. The CRDA resulted in the development of spatial mode characterization techniques for semiconductor lasers. The CRDA provided an avenue to supply the OSU Research Foundation with in-house developed ridge waveguide semiconductor lasers and in return provided verification of in-house developed models used to design the laser devices as well as fabrication verification. IntroductionCharacterization techniques to verify designed semiconductor operation needed to be developed to quantify the number and strength of the spatial modes. This is important because lasers operating with more than one spatial mode results in increased noise in telecommun...

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An interferometric method of laser beam analysis

Cited by 4 publications

References 11 publications

Laser beam quality and pointing measurement with an optical resonator

Laser beam quality and pointing measurement with an optical resonator

Determining spatial modes of lasers with spatial coherence measurements

Ohio State University Cooperative Research and Development Agreement (CRDA). Crystal Growth by Molecular Beam Epitaxy (MBE) and Characterization of Optoelectronic Devices

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