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Low-noise tunable deep-ultraviolet supercontinuum laser
Callum R Smith1, Asbjørn Moltke1, Abubakar I Adamu1
1DTU Fotonik, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark.
Scientific Reports
|October 29, 2020
Summary
A tunable deep-ultraviolet laser source was developed using argon-filled fiber, achieving low noise. This compact, stable laser is ideal for imaging and spectroscopy applications.
Area of Science:
- Laser Physics
- Nonlinear Optics
- Spectroscopy
Background:
- Deep-ultraviolet (UV) laser sources are crucial for advanced imaging and spectroscopy.
- Existing sources often lack tunability and possess undesirable noise characteristics.
- Minimizing source noise is critical for enhancing the precision of scientific measurements.
Purpose of the Study:
- To characterize the pulse-to-pulse relative intensity noise (RIN) of a tunable deep-UV laser source.
- To investigate the noise properties of a deep-UV source based on an argon-filled anti-resonant hollow-core fiber.
- To establish a benchmark for noise performance in compact, tunable deep-UV laser systems.
Main Methods:
- Utilized a 1030 nm, 400 fs laser, compressed to 30 fs pulses.
- Employed nonlinear compression and an argon-filled anti-resonant hollow-core fiber for supercontinuum generation.
- Tuned the resonant dispersive wave (RDW) output from 236 nm to 377 nm by adjusting argon pressure.
Main Results:
- Achieved a tunable deep-UV source with output tunable between 236-377 nm.
- Demonstrated exceptionally low RIN of 1.9% at ~282 nm under optimal conditions.
- Provided the first broadband RIN characterization of such a deep-UV source.
Conclusions:
- The argon-filled AR HC fiber laser offers a stable, compact, and tunable deep-UV source.
- The characterized low noise properties are a significant advancement for deep-UV applications.
- This work paves the way for widespread adoption of advanced deep-UV laser technology.
