Real time laser beam analysis system for high power lasers

Scaggs, Michael; Haas, Gil

doi:10.1117/12.871369

Cited by 21 publications

(11 citation statements)

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“…The trick is getting the data from the focused spot without interfering with the process or treatment. In 2010 Haas Laser Technologies, Inc. developed a novel method for analysing a laser beam with no moving parts [3]. This system permits collection of the ISO parameters at the combined frame rate of the camera sensor and the evaluation software which is typically faster than three (3) frames per second; dependent upon the type of computer being used.…”

Section: Introductionmentioning

confidence: 99%

Efficient optical design and measurement technique to six sigma laser processing

Scaggs¹,

Haas²

2014

SPIE Proceedings

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A six sigma laser processing system is proposed that utilizes real time measurement of ISO 11146 and ISO 13694 laser beam parameters without disrupting the process beam and with minimal loss. If key laser beam parameters can be measured during a laser process, without a disruption to the process, then a higher level of process control can be realized. The difficulty in achieving this concept to date is that most accepted beam measurement techniques are time averaged and require interruption of the laser beam and therefore have made it impractical for real time measurement which is necessary to consider six sigma process control.Utilizing an all passive optical technique to measure a laser's beam waist and other parameters for both focused and unfocused beams, the direct measurement of the ISO laser beam parameters are realized without disruption to the process and with minimal loss. The technique is simple enough to be applied to low and high power systems well into the multi-kilowatt range. Through careful monitoring of all laser beam parameters via software control of upper and lower limits for these parameters, tighter quality control is possible for achieving a six sigma process. In this paper we describe the optical design for both low and high power laser systems and how six sigma laser processing may be realized.

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Section: Introductionmentioning

confidence: 99%

Efficient optical design and measurement technique to six sigma laser processing

Scaggs¹,

Haas²

2014

SPIE Proceedings

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“…Thus, in terms of faster M 2 measurement, various methods have been proposed and demonstrated. For example, the motion-free variable-focus techniques utilize spatial light modulators [10] or liquid lenses [11], leading to a measuring time below 1 s. In addition, some single-shot schemes have also been reported, with which the beam cross sections can be imaged simultaneously on detectors using a distorted diffraction grating [12] or angled Fabry-Perot filter [13] and these schemes are tested by high power Nd:YAG lasers [12] or high power fiber lasers [13] respectively. Further, complex amplitude reconstruction methods using different kinds of interferometers [14,15] or just Charge-Coupled Device (CCD) [16] are proposed.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we have developed deep CNN for superfast and accurate M 2 prediction. Compared with traditional schemes [9][10][11][12][13][14][15][16][17][18][19][20][21], our approach is very economic, which only needs a CCD camera to obtain near-field beam patterns. The extraordinary time efficiency is another advantage of our scheme.…”

Section: Introductionmentioning

confidence: 99%

Deep learning enabled superfast and accurate M²evaluation for fiber beams

An¹,

Li²,

Huang³

et al. 2019

Opt. Express

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We introduce deep learning technique to predict the beam propagation factor M 2 of the laser beams emitting from few-mode fiber for the first time, to the best of our knowledge. The deep convolutional neural network (CNN) is trained with paired data of simulated nearfield beam patterns and their calculated M 2 value, aiming at learning a fast and accurate mapping from the former to the latter. The trained deep CNN can then be utilized to evaluate M 2 of the fiber beams from single beam patterns. The results of simulated testing samples have shown that our scheme can achieve an averaged prediction error smaller than 2% even when up to 10 eigenmodes are involved in the fiber. The error becomes slightly larger when heavy noises are added into the input beam patterns but still smaller than 2.5%, which further proves the accuracy and robustness of our method. Furthermore, the M 2 estimation takes only about 5 ms for a prepared beam pattern with one forward pass, which can be adopted for realtime M 2 determination with only one supporting Charge-Coupled Device (CCD). The experimental results further prove the feasibility of our scheme. Moreover, the method we proposed can be confidently extended to other kinds of beams provided that adequate training samples are accessible. Deep learning paves the way to superfast and accurate M 2 evaluation with very low experimental efforts.

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“…In 2010 Haas Laser Technologies, Inc. (Haas LTI) introduced an easy to use and compact laser beam waist analyzer camera that permitted evaluation of a focused laser beam through more than one Rayleigh range in real time [1]. In the four years following, we have measured a number of laser systems and found that many systems which had beam expansion telescopes in them exhibited severe third order aberrations, e.g., coma and/or astigmatism [2].…”

Section: Introductionmentioning

confidence: 99%

Optical alignment influenced aberrations in laser beam delivery systems and their correction

Scaggs¹,

Haas²

2015

SPIE Proceedings

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Industrial high power laser systems are often evaluated based upon spatial profile of the beam before they are brought to focus for processing materials. It is therefore often assumed that if the raw beam profile is good that the focus is equally as good. The possibility of having good optics and poor alignment or bad optics and good alignment and therefore not achieve a good focal spot is quite high due to the fact that a raw beam spatial profile does not manifest third order aberrations. In such instances the focal spot will contain aberrations when there are slightly misaligned, poor quality, high power optics in the system such as a beam expander or eye piece and objective of a 3-axis galvo. Likewise, if the beam itself is not on axis, the third order aberrations of astigmatism and coma are likely to appear but again not be seen in the unfocused beam's spatial profile. The third order aberrations of astigmatism, coma and spherical aberration can significantly alter both the size and spatial profile at the focus resulting in out of spec performance. The impact of beam and zoom expanders and their alignment in beam delivery systems is investigated by measuring both the far field unfocused and the far field focus beams using an all passive beam waist analyzer system.

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Real time laser beam analysis system for high power lasers

Cited by 21 publications

References 1 publication

Efficient optical design and measurement technique to six sigma laser processing

Efficient optical design and measurement technique to six sigma laser processing

Deep learning enabled superfast and accurate M²evaluation for fiber beams

Optical alignment influenced aberrations in laser beam delivery systems and their correction

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Real time laser beam analysis system for high power lasers

Cited by 21 publications

References 1 publication

Efficient optical design and measurement technique to six sigma laser processing

Efficient optical design and measurement technique to six sigma laser processing

Deep learning enabled superfast and accurate M2evaluation for fiber beams

Optical alignment influenced aberrations in laser beam delivery systems and their correction

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Deep learning enabled superfast and accurate M²evaluation for fiber beams