Demonstration of input wavelength flexible cascaded Raman resonators based on the inclusion of a broadband distributed feedback reflector

Roopa Prakash; V. Balaswamy; Vishal Choudhury; C. G. Lakshmi; V. R. Supradeepa

doi:10.1117/12.2509759

4 March 2019 Demonstration of input wavelength flexible cascaded Raman resonators based on the inclusion of a broadband distributed feedback reflector

Roopa Prakash, V. Balaswamy, Vishal Choudhury, C. G. Lakshmi, V. R. Supradeepa

Author Affiliations +

Proceedings Volume 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII; 109021D (2019) https://doi.org/10.1117/12.2509759
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Cascaded Raman fiber lasers are agile and scalable offering high optical powers at various wavelength bands inaccessible with rare-earth doped fiber lasers. Although several architectures for building cascaded Raman lasers exist, only the use of cascaded Raman resonators (CRRs) provide a high degree of power-independent wavelength conversion. A cascaded Raman resonator comprises of nested cavities built with two sets of high reflectivity fiber Bragg gratings at fixed Stokes wavelengths and thus can be used only for a fixed input wavelength; thereby restricting its use to a specific Ytterbium-doped fiber laser. The need for fabricating separate grating sets for each input wavelength compromises the simplicity and cost-effectiveness of this technique. Here, we demonstrate through experiment and simulations that the simple inclusion of a distributed broadband reflector at the first-order Stokes component along with the grating sets makes the CRR module very flexible to the input wavelengths, with remarkable improvement in efficiency over a widerange of inputs. In our experiment, a 17W Ytterbium-doped fiber laser tunable from 1055nm to 1080nm is used to pump a CRR module designed for an input wavelength of 1117nm and output wavelength of 1480nm. In conventional operation, for a non-resonant pump input into the CRR, nearly all the output was still unconverted pump. However, with the addition of the broadband distributed feedback reflector for the first-order Stokes component we achieved the 6thorder Stokes at 1480nm over the entire tuning range with a significant improvement in conversion ranging from ~33% to 86% of output at 1480nm.

Conference Presentation

Citation Download Citation

Roopa Prakash, V. Balaswamy, Vishal Choudhury, C. G. Lakshmi, and V. R. Supradeepa "Demonstration of input wavelength flexible cascaded Raman resonators based on the inclusion of a broadband distributed feedback reflector", Proc. SPIE 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 109021D (4 March 2019); https://doi.org/10.1117/12.2509759

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available