Temporal pulse precisely sculpted millijoule-level fiber laser injection system for high-power laser driver

Abstract

A fiber laser injection system used as a seeder for a high-power laser facility of inertial confinement fusion was designed to meet stringent requirements. Herein, we demonstrate the fiber laser injection system, whose output single-pulse energy reaches the millijoule class. With two-stage amplitude modulators, the system produces a pulse with a higher pulse shaping capability. In addition, amplifying the pulse with large-mode-area fiber and single polarization, large-mode-area photonic crystal fiber (PCF) ensures a good beam quality output. In this proof-of-principle experiment, the long-term stability of FM-to-AM modulation and pulse energy is demonstrated. The successful demonstration of this laser injection system holds great significance for future high-power laser drivers.

Two-Dimensional Tunable and Temperature-Insensitive Lyot Filter for FM-to-AM Compensation

“…Broadband spectrum in large scale laser facility which drives inertial confinement fusion (ICF) is essential due to the two reasons: suppressing of transverse stimulated Brillouin scattering (TSBS) and smoothing the speckle pattern illuminating the target [1][2][3][4]. Generally, a phase modulation is extensively adopted to broaden the spectrum of the single longitudinal mode seed source for matching the spectral requirement in ICF laser driver facility [5][6][7]. Ideally, the phase modulated pulse would maintain the original temporal shape when it propagates through the waveguides and optics with uniform spectral transmissions.…”