Octave-spanning supercontinuum generation in infrared by MoS 2 -filled hollow core fiber
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Octave-spanning supercontinuum generation in infrared by MoS2 -filled hollow core fiber Hyo-suk Kim, Youngho Cho, Byeongho Park, Subeen Park, Kwanil Lee, Yong-Sang Ryu, Chulki Kim, Taikjin Lee, Hyun Seok Song, Deok Ha Woo and Jae Hun Kim∗ Sensor System Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
Hyo-suk Kim and Youngchul Chung Department of Electronics and Communications Engineering, Kwangwoon University, Seoul 01897, Korea
Hyung Min Kim Department of Chemistry, Kookmin University, Seoul 02707, Korea (Received 20 August 2020; revised 15 October 2020; accepted 18 October 2020) We report the generation of an infrared (IR) supercontinuum spanning over an octave using a centimeter (6 cm) length of photonic crystal fiber (PCF) filled with MoS2 , which has a considerably large nonlinear refractive index. The fiber is pumped with a femto-second laser pulse with an infrared wavelength of 2080 nm, pumping intensity of 336.76 GW/cm2 , peak power of 0.75 GW, and pulse width of 150 fs. With the assistance of highly nonlinear MoS2 , a supercontinuum bandwidth that remarkably extends from 1400 to 2700 nm below 20 dB is achieved. This supercontinuum bandwidth significantly exceeds the previously reported spectra for other nonlinear glass-based optical fibers, even with a fairly short fiber length. Furthermore, this short fiber length allows PCF to be more efficiently utilized, and is expected to be suitable for various applications, such as broadband light source through liquid-based fibers and waveguide-based optical communications, especially in the IR region. Keywords: Mid-IR supercontinuum generation, Nonlinear optics, Transition metal dichalcogenides DOI: 10.3938/jkps.77.931
I. INTRODUCTION Ultra-broadband light sources are required for various applications, such as bio-imaging [1,2], absorption spectroscopy [3], and telecommunications [4]. Because infrared (IR) light provides more information about molecular vibration modes and fingerprinting [5, 6], broad bandwidth sources are extremely popular [7]. In the past, lamps were used to obtain applicable light sources in the IR region. However, IR measurement using lamps has various drawbacks such as low power density, power fluctuations, and collimation difficulty owing to low coherence. Using the supercontinuum, various experiments can be designed, which is better than conventional lamps with fine coherence and high power. Furthermore, pulsed IR radiation can transfer beam signal clearly for short time reactions occurring inside a material. However, the simultaneous generation of pulsed and broadband IR light sources is difficult because of technical limits, such as laser pulse width and wavelength. A supercon∗ E-mail:
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pISSN:0374-4884/eISSN:1976-8524
tinuum is a good candidate for pulsed IR generation since it can be easily generated with very short lasers and its bandwidth and spectra can be varied by pumping at various wavelengths [8,9]. Photonic crystal fiber (PCF) is the suitable medium for supercontinuum generation in o
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