Beam Smoothing Based on Prism Pair for Multistep Pulse Compressor in PW Lasers

Du, Shuman; Shen, Xinyu; Liang, Wenhai; Wang, Peng; Liu, Jun

doi:10.3390/photonics9070445

Cited by 4 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By substituting Equations ( 22) and (2) into Equation (23) and the result into Equation ( 24) we find w out,n (x,y), from which we obtain an expression for the spectrum of fluence fluctuations w out,n k x ,k y :…”

Section: Reducing Fluence Fluctuations At the Asymmetric Four-grating...mentioning

confidence: 99%

“…It is obvious that the compressor, in which the beam passes a considerable distance, is also a fluence fluctuation filter, but the properties of this filter have not been studied before. Moreover, to smooth fluence fluctuations it was recently proposed to use a pair of prisms [ 23 ] and an asymmetric four-grating compressor (AFGC) [ 24 ] , as well as a compressor with one pair of gratings [ 25 , 26 ] , which is a particular case of the AFGC. Numerical simulations were carried out in Refs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors

Khazanov

2023

High Pow Laser Sci Eng

View full text Add to dashboard Cite

All space-time coupling effects arising in an asymmetric optical compressor consisting of two non-identical pairs of diffraction gratings are described analytically. In each pair, the gratings are identical and parallel to each other, whereas the distance between the gratings, the groove density and the angle of incidence are different in different pairs. It is shown that the compressor asymmetry does not affect the far-field fluence and on-axis focal intensity. The main distinctive feature of the asymmetric compressor is spatial noise lagging behind or overtaking the main pulse in proportion to the transverse wave vector. This results in a degraded contrast but reduces beam fluence fluctuations at the compressor output. Exact expressions are obtained for the spectrum of fluence fluctuations and fluence root mean square that depends only on one parameter characterizing compressor asymmetry. The efficiency of small-scale self-focusing suppression at subsequent pulse post-compression is estimated.

show abstract

Section: Reducing Fluence Fluctuations At the Asymmetric Four-grating...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors

Khazanov

2023

High Pow Laser Sci Eng

View full text Add to dashboard Cite

show abstract

“…Although a prism pair with large apex angle can shorten the distance, the prism thickness will be increased, which is more expensive. Two perpendicular prism pairs can also shorten the distance [24]. Transmitting gratings may efficiently reduce the distance in the future.…”

Section: Beam Smoothing In the Near Fieldmentioning

confidence: 99%

“…Since the first grating has a relatively long nanosecond-pulse duration and has a high damage threshold, a relatively small spatial chirp is sufficient for protecting the first grating directly. In comparison to a spatial chirp line induced in one direction, the beam-smoothing effect is more effective when the spatial chirp induced in two directions [24]. To shield the compressor from all the random hotspots, one prism pair would be better located directly before the grating-based compressor.…”

Section: Multistage-smoothing-based Mpcmentioning

confidence: 99%

Multistage Smoothing Compressor for Multistep Pulse Compressors

Shen

Liang

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

Ultrahigh peak-power lasers are important scientific tools for frontier laser physics research, in which both the peak power improvement and operating safety are very important. Based on spatial-chirp-induced beam smoothing in both the near field and far field, a multistage-smoothing-based multistep pulse compressor (MS-MPC) is proposed here to further improve safety and operating convenience. In the MS-MPC, beam smoothing is not simply executed in the pre-compressor or main compressor but is separated into multiple stages. As a result, important and expensive optics are directly protected in every stage. The prism-pair-based pre-compressor induces a small spatial chirp, making it both easier to achieve than the previous multistep pulse compressor and sufficient to protect the first grating directly. Furthermore, the asymmetric four-grating compressor, which serves as the main compressor, induces a spatial chirp that further smooths the laser beam, protecting the last grating. In this way, a 10 s to 100 s petawatt laser pulse can be compressed with a single laser beam using the currently available optics. Additionally, an extra beam-smoothing stage can be added before the main amplifier to safeguard the largest amplification crystal from damage. The MS-MPC can be easily integrated into all existing PW laser facilities to improve their potential compressed pulse energy and operational safety.

show abstract

“…Recently, it was proposed to use a pair of prisms to smooth fluence fluctuations [10], but in high-power lasers they require considerable space and significantly deteriorate beam quality. A more elegant solution was proposed in [11] (an asymmetric four-grating compressor (AFGC)) and in [12,13] (a compressor with one pair of gratings, which is a particular case of AFGC).…”

Section: Introductionmentioning

confidence: 99%

2D-smoothing of laser beam fluctuations in optical compressor

Khazanov

2023

Laser Phys. Lett.

View full text Add to dashboard Cite

We propose a modification of the four diffraction gratings Treacy compressor (TC)—a double-smoothing grating compressor (DSGC)—which enables smoothing of spatial fluctuations of a laser beam in two directions. Smoothing along the groves is due to oblique incidence on the gratings or tilted grooves. Smoothing in the direction normal to the grooves is achieved due to the use of nonidentical pairs of gratings. It is shown that the far-field fluence and the focal beam intensity after the DSGC are like those after the TC. Smoothing is a consequence of spatial harmonics lagging behind or overtaking the main pulse in proportion to the transverse wave vector. Analytical expressions are obtained for the spectrum of fluence fluctuations and fluence rms at the DSGC output. The efficiency of suppressing small-scale self-focusing in transmissive optical elements after the DSGC, for example, in the case of post-pulse compression is assessed.

show abstract

Beam Smoothing Based on Prism Pair for Multistep Pulse Compressor in PW Lasers

Cited by 4 publications

References 27 publications

Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors

Reducing laser beam fluence and intensity fluctuations in symmetric and asymmetric compressors

Multistage Smoothing Compressor for Multistep Pulse Compressors

2D-smoothing of laser beam fluctuations in optical compressor

Contact Info

Product

Resources

About