Abstract

Phase-matched nonlinear processes exhibit a tradeoff between the conversion efficiency and the acceptance bandwidth. Adiabatic nonlinear processes, in which the phase mismatch varies slowly along the interaction length, enable us to overcome this tradeoff, allowing an efficient frequency conversion with broad spectral and thermal bandwidths. Until now, the variation in the phase mismatch condition was mainly based on quasi-phase matching in ferroelectric crystals. However, this solution is limited to low power sources. Here, instead, we study the adiabatic second harmonic in birefringently phase-matched lithium triborate crystal, enabling us to handle much higher power levels. The variation in the phase mismatch is achieved by inducing a temperature gradient along the crystal. By using a 50 mm long crystal, the adiabatic process provided a temperature bandwidth of 18°C, 5.4 times wider than what is achieved when the same crystal is held at the fixed phase-matching temperature. The conversion efficiency exceeded 60% for a 0.9 millijoule pump pulse.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Temperature-insensitive second-harmonic generation based on noncollinear phase matching in a lithium triborate crystal

Daolong Tang, Jing Wang, Bingjie Zhou, Guoqiang Xie, Jingui Ma, Peng Yuan, Heyuan Zhu, and Liejia Qian
J. Opt. Soc. Am. B 34(8) 1659-1668 (2017)

Adiabatic second-harmonic generation

Anat Leshem, Guilia Meshulam, Gil Porat, and Ady Arie
Opt. Lett. 41(6) 1229-1232 (2016)

Efficient second-harmonic generation of a broadband radiation by control of the temperature distribution along a nonlinear crystal

K. Regelskis, J. Želudevičius, N. Gavrilin, and G. Račiukaitis
Opt. Express 20(27) 28544-28556 (2012)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription