Widely tunable visible pulsed cascaded Raman fiber laser source

Abhigyan Goswami; Sarthak Dash; Rashmita Deheri; V. R. Supradeepa

doi:10.1117/12.3000916

12 March 2024 Widely tunable visible pulsed cascaded Raman fiber laser source

Abhigyan Goswami, Sarthak Dash, Rashmita Deheri, V. R. Supradeepa

Proceedings Volume 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; 128690H (2024) https://doi.org/10.1117/12.3000916
Event: SPIE LASE, 2024, San Francisco, California, United States

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.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Abhigyan Goswami, Sarthak Dash, Rashmita Deheri, and V. R. Supradeepa "Widely tunable visible pulsed cascaded Raman fiber laser source", Proc. SPIE 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, 128690H (12 March 2024); https://doi.org/10.1117/12.3000916

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