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  Laser beam quality and pointing measurement with an optical resonator

Kwee, P., Seifert, F., Willke, B., & Danzmann, K. (2007). Laser beam quality and pointing measurement with an optical resonator. Review of Scientific Instruments, 78(7): 073103. doi:10.1063/1.2754400.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4812-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4814-E
Genre: Journal Article

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073103.pdf (Publisher version), 732KB
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 Creators:
Kwee, Patrick1, Author              
Seifert, Frank1, Author              
Willke, Benno1, Author              
Danzmann, Karsten1, Author              
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 Abstract: 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 M2 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 |epsilon|=1×10−6/sqrt(Hz).

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 Dates: 2007-07
 Publication Status: Published in print
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Title: Review of Scientific Instruments
  Alternative Title : Rev. Sci. Instrum.
Source Genre: Journal
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Pages: - Volume / Issue: 78 (7) Sequence Number: 073103 Start / End Page: - Identifier: -