Dissertation Defense: Josh Olson, "Development and Characterization of Infrared Pulsed Fiber Lasers"

    Monday, April 5, 2021 - 1:00pm

    Joshua Linne Olson is inviting you to a scheduled Zoom meeting.

    Join Zoom Meeting: https://arizona.zoom.us/j/84034884161

    Password: 190034 


    Infrared pulsed fiber lasers have become indispensable scientific instruments. Application of these tools depends on the required pulse duration, pulse energy and stability of the laser source among other features. To extend the range of applications for these instruments, significant work is being done to develop infrared pulsed laser sources which can meet requirements in a compact and robust all-fiber format. This dissertation covers the development of two all-fiber laser systems operating in the short-wave infrared and a technique for characterizing the timing noise of mode-locked lasers in real-time.

    The first laser source was developed for applications that require nanosecond pulses with high pulse energy and eye-safe emission such as direct detection LiDAR systems. For this source, a highly erbium-doped very large mode-area phosphate gain fiber was developed and tested as the last stage gain fiber of an all-fiber master oscillator power amplifier (MOPA). This laser system has an adjustable repetition rate and pulse-duration and delivers up to 3 mJ of pulse energy with a 5 kHz repetition rate.

    The second laser source was developed as a simple and affordable platform for the detection of atmospheric H2O and CO2. This laser source uses a bidirectionally mode-locked thulium doped fiber ring laser to produce two coherently linked frequency combs around 1870 nm. Atmospheric detection of H2O using the dual-comb spectroscopy technique was demonstrated with this laser source.

    A method of characterizing the timing error in mode-locked fiber lasers in real-time was developed to fill the need of high-frequency photonic analog to digital converters (PADC) which incur signal noise and distortion from pulsed laser jitter. Real-time correction of a phase-encoded optical sampling PADC operating at frequencies up to 40 GHz was demonstrated as a proof-of-principle of this technique.