Frequency doubling in three laser regimes using nonlinear polarization rotation laser

Shruti Sundar; Anil Prabhakar

doi:10.1117/12.2609252

13 April 2022 Frequency doubling in three laser regimes using nonlinear polarization rotation laser

Shruti Sundar, Anil Prabhakar

Proceedings Volume 11981, Fiber Lasers XIX: Technology and Systems; 1198117 (2022) https://doi.org/10.1117/12.2609252
Event: SPIE LASE, 2022, San Francisco, California, United States

Conference Poster

Abstract

A unidirectional ring cavity was developed and characterized, using a Yb-doped double-clad fiber with nonlinear polarization rotation (NPR). Depending on the relative orientations of the quarter and half-wave plates, we observed that the laser operated in different regimes: Continuous-wave(CW), Q-switching(QS), and Modelocking(ML). We observed that the central wavelength was at 1064.5 nm in each of the different laser regimes. Mode-locking a laser with NPR is attractive due to its simplicity, with the locking being induced by the optical Kerr effect along with the fiber while the wave-plates and filters act as an artificial saturable absorber. The total cavity length of the Yb-doped fiber laser was about 10.8 m, including a free space segment, giving us a 18 MHz repetition rate for the mode-locked pulses. In the Q-switched regime, a pulse train with repetition rates from 14 kHz to 35 kHz and pulse widths from 980 ns to 3 μs were observed by varying the pump power. Lastly, we utilized this laser as a pump source to conduct a comparative study of the frequency-doubling characteristics in a single-pass configuration using MgO:PPLN crystal of 10 mm and 20 mm lengths in the three laser regimes. The second harmonic efficiencies obtained at CW, QS, ML for the crystal length of 10 mm were 2.15% , 11.1%, and 13.6% while for 20 mm they were 2.27%, 15.8%, and 18.7% respectively.

Citation Download Citation

Shruti Sundar and Anil Prabhakar "Frequency doubling in three laser regimes using nonlinear polarization rotation laser", Proc. SPIE 11981, Fiber Lasers XIX: Technology and Systems, 1198117 (13 April 2022); https://doi.org/10.1117/12.2609252

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