Abstract

Dispersive pulse-stretching at 2.0 μm has long been hindered by the high intrinsic optical loss from conventional dispersive media. Here a flexible pulse-stretching technique at 2.0 μm is demonstrated over a broad bandwidth with large-scale dispersion and low intrinsic optical loss. The technique employs the newly proposed pulse-stretching scheme, namely, free-space angular-chirp-enhanced delay. Both normal and anomalous temporal dispersion (up to $\pm 500\mathrm{ps}/\mathrm{nm}$) with low intrinsic loss ($<6\mathrm{dB}$) over a spectral bandwidth of $\sim 84\mathrm{nm}$ at 2.0 μm is obtained with low nonlinear effects. Based on this method, an optical wavelength-swept source at 2.0 μm is realized and applied to spectrally encoded imaging at a line scan rate of $\sim 19\mathrm{MHz}$, proving the potential of this pulse-stretching technique for continuous single-shot measurements at the 2.0 μm wavelength regime, particularly for optical microscopy and spectroscopy.

© 2017 Optical Society of America

High-speed wavelength-swept source at 2.0 μm and its application in imaging through a scattering medium

Sisi Tan, Lingxiao Yang, Xiaoming Wei, Can Li, Nan Chen, Kevin K. Tsia, and Kenneth K. Y. Wong
Opt. Lett. 42(8) 1540-1543 (2017)

Real-time spectral analysis of ultrafast pulses using a free-space angular chirp-enhanced delay

Yiqing Xu and Stuart G. Murdoch
Opt. Lett. 44(15) 3697-3700 (2019)

Ultrafast optical imaging at 2.0  μm through second-harmonic-generation-based time-stretch at 1.0  μm

Sisi Tan, Xiaoming Wei, Bowen Li, Queenie T. K. Lai, Kevin K. Tsia, and Kenneth K. Y. Wong
Opt. Lett. 43(16) 3822-3825 (2018)

16  MHz wavelength-swept and wavelength-stepped laser architectures based on stretched-pulse active mode locking with a single continuously chirped fiber Bragg grating

Reza Khazaeinezhad, Meena Siddiqui, and Benjamin J. Vakoc
Opt. Lett. 42(10) 2046-2049 (2017)

4.2 PW, 20 fs Ti:sapphire laser at 0.1 Hz

Jae Hee Sung, Hwang Woon Lee, Je Yoon Yoo, Jin Woo Yoon, Chang Won Lee, Jeong Moon Yang, Yeon Joo Son, Yong Ha Jang, Seong Ku Lee, and Chang Hee Nam
Opt. Lett. 42(11) 2058-2061 (2017)