Observation of the temporal evolution of transverse coherence in copper vapour lasers

Coutts, David W.; Ainsworth, M. D.; Piper, James A.

doi:10.1016/0030-4018(92)90468-7

Cited by 23 publications

(3 citation statements)

References 5 publications

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“…17 Here at z ϭ 0, for fixed values of N (i.e., 5, 20, and 40) the numerical value of the kurtosis parameter of a FGBHM ( ϭ 1), by use of Eqs. (13) and (21), is calculated and its changes versus ⑀ are plotted in Fig. 11.…”

Section: Discussionmentioning

confidence: 99%

“…It should be stated that the second two of the three temporal components of the output beam create a coherent beam. 13 Pulse-averaged near-field intensity profiles of the green component of the laser output were recorded by use of a dichroic filter to reject the yellow component and the imaging, by means of an f ϭ 250 mm achromatic lens, onto the CCD camera (Spiricon, Model TM 745) of a laser beam analyzer (Spiricon, Model LBA-PC). After optimization by use of the knife-edge method this imaging configuration was fixed to an optical rail to ensure self-consistency as near-field intensity profiles were recorded at different positions along the propagation axis, namely, z ϭ 0, 0.85, 2.45, 5.05, 15.3 m; z ϭ 0 corresponds to the plane immediately behind the output coupler.…”

Section: A Experimental Methodsmentioning

confidence: 99%

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Characterizing output beams for lasers that use high-magnification unstable resonators

2001

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Laser beams generated from high-magnification on-axis unstable resonators by use of hard-edged optics typically have a doughnut-shaped distribution in the near field (i.e., a flat-top profile with a hole in the middle for an axially coupled beam). We derive analytical expressions describing this distribution by using the flattened Gaussian beams concept. The superposition of two flattened Gaussian beams whose flatness and steepness of edges are controlled by defined parameters (i.e., the beam width and the order) is used to analyze the output beam intensity along the propagation axis. Finally, experimental measurements of beam propagation from a copper-vapor laser fitted with a high-magnification unstable resonator show excellent agreement with theoretical predictions.

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Section: Discussionmentioning

confidence: 99%

Section: A Experimental Methodsmentioning

confidence: 99%

Characterizing output beams for lasers that use high-magnification unstable resonators

2001

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“…Recently there has been considerable interest in improving the output beam quality from coppervapor lasers (CVL's) in order to promote efficient frequency conversion of the CVL output by using nonlinear optical techniques. 1 ' 2 While it is well understood that the high gain and short inversion time in CVL's necessitate the use of unstable resonators for improved beam quality, some features of the temporal evolution of beam quality in CVL's that are equipped with unstable resonators remain unclear. In particular, while the growth in the transverse coherence of the CVL output during the pulse has been experimentally determined," 2 previous studies of the temporal evolution of the divergence of the CVL output 3 have been only qualitative in nature.…”

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confidence: 99%

Measurements of the divergence evolution of a copper-vapor laser output by using a cylindrical imaging technique

1993

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The temporal evolution of divergence of the output of a copper-vapor laser (CVL) operating with a high-magnification (M = 26.5) unstable resonator is measured by using a one-dimensional imaging system together with a fast gated linear diode array detector. The CVL output is found to consist of several temporally resolved components, with each successive component having lower divergence. The final component of the output has essentially diffraction-limited divergence. The divergence behavior is modeled by using an unfolded resonator-equivalent lens guide, with geometric constraints on the propagation of spontaneous emission within the lens guide, and is found to match the experimentally determined behavior.

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Beam Quality Issues in Copper Vapour Lasers

Brown

Coutts

1996

Pulsed Metal Vapour Lasers

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Observation of the temporal evolution of transverse coherence in copper vapour lasers

Cited by 23 publications

References 5 publications

Characterizing output beams for lasers that use high-magnification unstable resonators

Characterizing output beams for lasers that use high-magnification unstable resonators

Measurements of the divergence evolution of a copper-vapor laser output by using a cylindrical imaging technique

Beam Quality Issues in Copper Vapour Lasers

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