Abstract

A nonlinear structure for efficient Cherenkov-type terahertz emission from ultrashort laser pulses is proposed, modeled, and experimentally demonstrated. The structure comprises a thin (a few tens of micrometers thick) layer of lithium niobate sandwiched between two silicon prisms. A focused-to-a-line laser pulse propagates in the layer and generates a Cherenkov wedge of terahertz radiation in the prisms. The radiation experiences total internal reflection in the prisms and emerges into free space as two adjacent beams collinear to the pump laser beam. The structure can generate a centimeter-wide terahertz beam with high transverse uniformity and a flat frequency spectrum. An optical-to-terahertz conversion efficiency as high as 0.35% is achieved with 10-µJ laser pulses. It can be further enhanced by reducing the thickness of the lithium niobate layer.

© 2020 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Generation of 0.7 mJ multicycle 15 THz radiation by phase-matched optical rectification in lithium niobate

Dogeun Jang, Jae Hee Sung, Seong Ku Lee, Chul Kang, and Ki-Yong Kim
Opt. Lett. 45(13) 3617-3620 (2020)

Asymmetric Cherenkov radiation for improved terahertz generation in the Si-prism-coupled LiNbO3 layer

M. I. Bakunov, E. A. Mashkovich, and E. V. Svinkina
Opt. Lett. 39(24) 6779-6782 (2014)

Efficient electro-optic sampling detection of terahertz radiation via Cherenkov phase matching

Masahiko Tani, Kazuki Horita, Tetsuya Kinoshita, Christopher T. Que, Elmer Estacio, Kohji Yamamoto, and Michael I. Bakunov
Opt. Express 19(21) 19901-19906 (2011)

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 (6)

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

Equations (4)

You do not have subscription access to this journal. Equations 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