Robust 2070 nm ns pulsed PM laser module with 250 W peak output power and 12uJ pulse energy

Wiktor T. Walasik; Shivaraman Asoda; Gustavo Rivas; Robert E. Tench; Jean-Marc Delavaux

doi:10.1117/12.2648395

27 March 2023 Robust 2070 nm ns pulsed PM laser module with 250 W peak output power and 12μJ pulse energy

Wiktor T. Walasik, Shivaraman Asoda, Gustavo Rivas, Robert E. Tench, Jean-Marc Delavaux

Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124001M (2023) https://doi.org/10.1117/12.2648395
Event: SPIE LASE, 2023, San Francisco, California, United States

Conference Poster

Abstract

Highly stable, high peak output power pulsed transmitter sources in the 2000 nm band are essential seed lasers for diverse applications such as LIDAR, ground-to-space optical communications, detection of trace gases in the atmosphere, medical applications, and pumping optical parametric oscillators and supercontinuum sources. Previous work utilizing single clad, single mode fibers has demonstrated pulsed mode operation of an optically amplified source at 2051 nm and 2090 nm with pulse widths ranging from 5–500 ns, pulse repetition frequencies (PRFs) of 20–300 kHz, and peak output pulse energies of 10 μJ. In this paper, we report the design and performance of a novel nanosecond MOPA optical transmitter at a signal wavelength of 2070 nm with more than 250 W peak output power and highly stable output pulses. The seed laser is broadened using a phase modulator, to minimize the onset of optical nonlinearities such as SBS and MI and then amplified using a two-stage Ho-doped fiber amplifier (HDFA) employing 8-μm core active fiber. The amplified signal is then transmitted through a tandem arrangement with a 250 MHz acousto-optic modulator (AOM) followed by a high-speed electro-optic amplitude modulator (EOM). This pulses signal is then reamplified by a two-stage HDFA where the second stage employs a 20-μm core active fiber, which reduces the threshold for the onset of nonlinear effects such as modulation instability (MI) and four-wave mixing. We present a comparison of optical simulation results with experimental data for the medium- and large-core Ho-doped fibers in the MOPA transmitter.

Citation Download Citation

Wiktor T. Walasik, Shivaraman Asoda, Gustavo Rivas, Robert E. Tench, and Jean-Marc Delavaux "Robust 2070 nm ns pulsed PM laser module with 250 W peak output power and 12μJ pulse energy", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124001M (27 March 2023); https://doi.org/10.1117/12.2648395

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