High photon flux K&#x03B1; Mo x-ray source driven by a multi-terawatt femtosecond laser at 100&#x2009;&#x2009;Hz

Y. Azamoum; R. Clady; A. Ferré; M. Gambari; O. Utéza; M. Sentis

doi:10.1364/OL.43.003574

Optics Letters
Vol. 43,
Issue 15,
pp. 3574-3577
(2018)
•https://doi.org/10.1364/OL.43.003574

High photon flux K_α Mo x-ray source driven by a multi-terawatt femtosecond laser at 100 Hz

Y. Azamoum, R. Clady, A. Ferré, M. Gambari, O. Utéza, and M. Sentis

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Y. Azamoum, R. Clady, A. Ferré, M. Gambari, O. Utéza, and M. Sentis, "High photon flux Kα Mo x-ray source driven by a multi-terawatt femtosecond laser at 100 Hz," Opt. Lett. 43, 3574-3577 (2018)

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Abstract

We develop a pulsed hard x-ray $K_{α}$ source at 17.4 keV produced by the interaction of a multi-terawatt peak power infrared femtosecond laser pulse with a thick molybdenum (Mo) target at a 100 Hz repetition rate. We measure the highest Mo $K_{α}$ photon production reported to date corresponding to a $K_{α}$ photon flux of $1 \times 10^{11} ph / (sr \cdot s)$ and an estimated peak brightness of $\sim 2.5 \times 10^{17} ph / (s \cdot {mm}^{2} \cdot {mrad}^{2} (0.1 % bandwidth))$ at $\sim 5 \times 10^{18} W / {cm}^{2}$ driving laser intensity.

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Laser Facility and X-ray Source Characteristics	CUOS- Michigan [28]	LLP- Shanghai [11]	INRS- ALLS Facility [12]	LP3-ASUR Facility (Our Source)
Laser Pulse energy (mJ)	1.3	14	245	122
Intensity ( $W / {cm}^{2}$ )	$2.2 \times 10^{18}$	$1.2 \times 10^{18}$	$1.75 \times 10^{18}$	$6.2 \times 10^{18}$
Contrast Ratio	$\sim 10^{6}$	$\sim 10^{6}$	$\sim 10^{10}$	$\sim 10^{10}$
$K_{α}$ photon Number ( $ph / (sr \cdot shot)$ )	$1.22 \times 10^{6}$	$4.7 \times 10^{7}$	$2.8 \times 10^{9}$	$1 \times 10^{9}$
$K_{α}$ conversion efficiency (Laser energy to $K_{α}$ ) in $2 π$ sr	$1.6 \times 10^{- 5}$	$5.7 \times 10^{- 5}$	$2 \times 10^{- 4}$	$1.3 \times 10^{- 4}$
Repetition rate (kHz)	0.4	1	0.01	0.1
$K_{α}$ photon number ( $ph / (sr \cdot s)$ )	$4.9 \times 10^{8}$	$4.7 \times 10^{10}$	$2.8 \times 10^{10}$	$1 \times 10^{11}$

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