Development of a variable focal length concave mirror for on-shot thermal lens correction in rod amplifiers

Schwarz, Jens; Geißel, Matthias; Rambo, Patrick K.; Porter, J. L.; Headley, Daniel; Ramsey, Marc

doi:10.1364/oe.14.010957

Cited by 22 publications

(5 citation statements)

References 6 publications

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“…Due to the reproducible nature of this prompt focus, it can be corrected via a single actuator adaptive optic designed at Sandia. 28 At this sub-aperture beamsize, 425 J has been demonstrated to date. The amplified beam at this point can go one of two directions.…”

Section: The Z-petawatt Lasermentioning

confidence: 89%

Sandia's Z-Backlighter Laser Facility

Rambo¹,

Schwarz²,

Schollmeier³

et al. 2016

SPIE Proceedings

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The Z-Backlighter Laser Facility at Sandia National Laboratories was developed to enable high energy density physics experiments in conjunction with the Z Pulsed Power Facility at Sandia National Laboratories, with an emphasis on backlighting. Since the first laser system there became operational in 2001, the facility has continually evolved to add new capability and new missions. The facility currently has several high energy laser systems including the nanosecond/multi-kilojoule Z-Beamlet Laser (ZBL), the sub-picosecond/kilojouleclass Z-Petawatt (ZPW) Laser, and the smaller nanosecond/100 J-class Chaco laser. In addition to these, the backlighting mission requires a regular stream of coated consumable optics such as debris shields and vacuum windows, which led to the development of the Sandia Optics Support Facility to support the unique high damage threshold optical coating needs described.

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Section: The Z-petawatt Lasermentioning

confidence: 89%

Sandia's Z-Backlighter Laser Facility

Rambo¹,

Schwarz²,

Schollmeier³

et al. 2016

SPIE Proceedings

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“…As Fig. 2 tells, Former Soviet Union [18][19][20], France [21][22][23], Germany [24,25], America [26][27][28], Japan [29,30] and China [10,31,32] have done lots of research on VCM for different application purposes and we also make our own contributions to this field as well [12][13][14][15][16]. Among these versatile applications, focus adjusting and zooming are two basic ones.…”

Section: Re-focusmentioning

confidence: 99%

Depth of focus extension of space-borne optical camera through variable curvature mirror

Zhao,

Xie,

Yang

et al. 2023

Optical Design and Testing XIII

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Currently, most space-borne optical cameras have fixed focal length and depth of focus. In this case, the range within which the target can be clearly imaged has been pre-determined before launch. However, the distance of the target to the optical camera might be unknown or change very fast and therefore focus adjustment has to be carried out to obtain clear images. However, no matter which refocusing technique is used, focus adjustment might lag behind the object distance variation and depth of focus extension is a better way. Wave-front coding can be used to extend the depth of focus of incoherent imaging system but the surface profile of the phase mask could not be changed dynamically, which is not flexible for application. In this manuscript, by combing the variable curvature mirror (VCM) and coded imaging technique together, a new depth of focus extension technique is proposed. According to our previous studies, the focal plane could be quickly adjusted by changing the curvature radius of VCM. Compared with the curvature variation speed, the exposure time of the camera is quite long. Therefore, by adjusting the focal plane very fast in a wide range during the exposure through VCM, an equivalent coded optical transfer function having no null frequency points within bandwidth is generated and the image captured is uniformly blurred. After that, with the help of digital restoration, the clear image could be obtained. Because the focal plane could be adjusted through variable curvature mirror in the range of millimeter, the proposed method could be used to obtain clear images with greatly extended depth of focus.

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“…As the space telescope will be located in L2 where the environmental conditions are harsh and energy is rare, a reliable set-and-forget approach with "powerless" actuators is implemented. 'Set-and-forget'-DMs for Earth based applications were investigated previously by [4], [5], [6] and [7]. The principal of the HYPATIA correction chain is to separate the modes of aberration that has to be corrected into low and high order.…”

Section: Introductionmentioning

confidence: 99%