Widely tunable visible pulsed cascaded Raman fiber laser source. Goswami, A., Dash, S., Deheri, R., & Supradeepa, V. R. In Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, volume 12869, pages 128690H, 2024. International Society for Optics and Photonics, SPIE.
Widely tunable visible pulsed cascaded Raman fiber laser source [link]Paper  doi  abstract   bibtex   
We have generated a visible laser by second harmonic generation from a pulsed Cascaded Raman fiber Lasers (CRFL) continuously tunable in 1060nm-1600nm, using type-I LBO. To eliminate the requirement of precise synchronization and control, we employed a passive Q-switching mechanism for the Yb laser pumping the Raman module. The pump is made continuously tunable in Yb-band with wavelength dependent feedback in the Q-switched cavity ensuring continuous wavelength tunability of generated Raman Stokes. We utilized a large mode-area amplifier to amply pulse-energy without introducing temporal instability and optimized Raman module for efficient pump conversion. We demonstrated a widely tunable visible laser with approximately μJ pulse-energy and approximately 20 − 65kHz repetition-rate, 40-200ns pulse duration. This is the first demonstration of a high pulse energy nanosecond laser continuously tunable in 530nm-600nm making it a versatile laser source for numerous biomedical applications. The wavelength tunable range can be extended to 700nm by utilizing type-II LBO.
@inproceedings{10.1117/12.3000916,
author = {Abhigyan Goswami and Sarthak Dash and Rashmita Deheri and V. R. Supradeepa},
title = {{Widely tunable visible pulsed cascaded Raman fiber laser source}},
volume = {12869},
booktitle = {Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII},
editor = {Peter G. Schunemann},
organization = {International Society for Optics and Photonics},
publisher = {SPIE},
pages = {128690H},
keywords = {Visible laser source, fiber laser, Raman fiber laser, continuously tunable visible laser, Q-switched laser, second harmonic generation, Pulsed Raman, photoacoustic imaging},
year = {2024},
doi = {10.1117/12.3000916},
URL = {https://doi.org/10.1117/12.3000916},
abstract={We have generated a visible laser by second harmonic generation from a pulsed Cascaded Raman fiber Lasers (CRFL) continuously tunable in 1060nm-1600nm, using type-I LBO. To eliminate the requirement of precise synchronization and control, we employed a passive Q-switching mechanism for the Yb laser pumping the Raman module. The pump is made continuously tunable in Yb-band with wavelength dependent feedback in the Q-switched cavity ensuring continuous wavelength tunability of generated Raman Stokes. We utilized a large mode-area amplifier to amply pulse-energy without introducing temporal instability and optimized Raman module for efficient pump conversion. We demonstrated a widely tunable visible laser with approximately μJ pulse-energy and approximately 20 − 65kHz repetition-rate, 40-200ns pulse duration. This is the first demonstration of a high pulse energy nanosecond laser continuously tunable in 530nm-600nm making it a versatile laser source for numerous biomedical applications. The wavelength tunable range can be extended to 700nm by utilizing type-II LBO. }
}

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