Research on output beam characteristic from unstable resonator of DF laser

Effects of small misalignments on output beam quality in off-axis negative-branch confocal strip unstable resonator

10.1117/12.843428 ◽

2009 ◽

Author(s):

Gen Li ◽

Xiahui Tang ◽

Du Wang

Keyword(s):

Beam Quality ◽

Unstable Resonator ◽

Output Beam ◽

Negative Branch

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Output beam analysis of an unstable resonator with a large Fresnel number for a chemical oxygen iodine laser

Optical Engineering ◽

10.1117/1.1499971 ◽

2002 ◽

Vol 41 (10) ◽

pp. 2668 ◽

Cited By ~ 5

Author(s):

Deli Yu

Keyword(s):

Unstable Resonator ◽

Output Beam ◽

Fresnel Number ◽

Iodine Laser ◽

Chemical Oxygen Iodine Laser ◽

Beam Analysis

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Characterizing flat-top laser beams using standard beam parameters

Canadian Journal of Physics ◽

10.1139/p06-012 ◽

2006 ◽

Vol 84 (3) ◽

pp. 223-240 ◽

Cited By ~ 2

Author(s):

S Saghafi ◽

M J Withford ◽

Z Ghoranneviss

Keyword(s):

Near Field ◽

Analytical Models ◽

Model Parameters ◽

Fourth Moment ◽

Output Beam ◽

Field Versus ◽

Kurtosis Parameter ◽

Beam Characteristic ◽

Padé Method ◽

Beam Parameters

We examine the correspondence between various models describing flat-top laser beam profiles using two standard parameters; namely, the M2 factor and the kurtosis parameter. Numerical expressions for M2, based on the second moment of the beam irradiance distribution in the near and far fields and for the kurtosis parameter, k, based on the fourth moment at the near field, are obtained. Plots of k in the near field versus M2 demonstrate the similarities between the different analytical models used to describe flat-top profiles. Using the Padé approximation, a relationship between k and M2, a new reference formula, is derived that predicts the values of M2 to within less than a percent for these flattened beams. This method is then extended to define numerical expressions relating the beam parameters (i.e., M2 and k) and the parameters describing the beam characteristic in each analytical model (model parameters). The results obtained using the Padé method are used to describe the output beam profiles for a high power copper vapour laser fitted with an unstable resonator.PACS Nos.: 42.55.–f, 42.55.Lt, 42.60.–v

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