Synthesis of spatial filters for investigation of the transverse mode composition of coherent radiation

Golub, Michael A.; Prokhorov, A M; Sisakyan, I N; Soifer, V. A.

doi:10.1070/qe1982v012n09abeh005998

Cited by 51 publications

(27 citation statements)

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“…With a power of 0.14%, each of the TEM 10 and TEM 01 modes contributes to the 8.5% of the overall power in higher modes ͑Fig. 3͒.…”

Section: Resultsmentioning

confidence: 99%

“…If the test beam has a high fraction of its power in the TEM 00 mode, then the excitation of TEM 10 and TEM 01 modes in the resonator can be reduced arbitrarily by alignment. If the test beam is transverse shifted by ␦x and angular tilted by ␦␣ in the x or y direction with respect to the fundamental mode of the resonator, then the power of the TEM 10 or, respectively, TEM 01 mode can be calculated to first order.…”

Section: -3mentioning

confidence: 99%

“…If the test beam is transverse shifted by ␦x and angular tilted by ␦␣ in the x or y direction with respect to the fundamental mode of the resonator, then the power of the TEM 10 or, respectively, TEM 01 mode can be calculated to first order. 25 From the power in the TEM 10 and TEM 01 modes, the quality of the alignment of the test beam can be determined conversely,…”

Section: -3mentioning

confidence: 99%

“…This linear spectral density is often used in the field of interferometric gravitational wave detectors to characterize the pointing of a laser beam. In addition to the DWS measurements, the quantity ͉⑀͉ 2 was measured directly by detecting the power fluctuations of the TEM 10 and TEM 01 modes. These power fluctuations normalized to the power of the TEM 00 mode are equal to ͉⑀͉ 2 ͓see.…”

Section: Pointingmentioning

confidence: 99%

“…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%

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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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“…With a power of 0.14%, each of the TEM 10 and TEM 01 modes contributes to the 8.5% of the overall power in higher modes ͑Fig. 3͒.…”

Section: Resultsmentioning

confidence: 99%

Section: -3mentioning

confidence: 99%