RF control of THz quantum cascade laser frequency combs (Conference Presentation)

Giacomo Scalari; Andres Forrer; David Stark; Urban Senica; Tudor Olariu; Philipp Täschler; Mattias Beck; Jerome Faist

doi:10.1117/12.2556090

30 March 2020 RF control of THz quantum cascade laser frequency combs (Conference Presentation)

Giacomo Scalari, Andres Forrer, David Stark, Urban Senica, Tudor Olariu, Philipp Täschler, Mattias Beck, Jerome Faist

Proceedings Volume 11348, Terahertz Photonics; 113480C (2020) https://doi.org/10.1117/12.2556090
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

Recently, on-chip quantum-cascade-laser-based frequency combs are gaining increasing attention both in the Mid-IR and in the THz spectral regions. THz devices offer the possibility of filling the gap of comb sources in a spectral region were no table-top comb is available. I will discuss direct THz comb generation from both homogeneous and heterogeneous quantum cascade lasers. Octave spanning emission spectra and comb operation on bandwidth larger than 1 THz are reported for heterogeneous cascades. I will also report on a series of new structures with homogeneous cascade design that feature a very low threshold current density (< 100 A/cm2), a bandwidth of roughly 1 THz centered a 3 THz and an extremely wide bandwidth (>1.8 THz) when driven in the NDR region. This extremely broadband emission in the NDR is studied as well with NEGF simulation and is based on an interplay between strong photon assisted transport due to the highly diagonal transition and domain formation.These structures are also showing RF injection locking with extremely reduced microwave powers. We will discuss locking experiments as well as a method to finely control the repetition rate of the laser based on controlled optical feedback. Time resolved spectral measurements aimed to clarify the physics of field domains in the NDR will be also presented.

Conference Presentation

Citation Download Citation

Giacomo Scalari, Andres Forrer, David Stark, Urban Senica, Tudor Olariu, Philipp Täschler, Mattias Beck, and Jerome Faist "RF control of THz quantum cascade laser frequency combs (Conference Presentation)", Proc. SPIE 11348, Terahertz Photonics, 113480C (30 March 2020); https://doi.org/10.1117/12.2556090

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Terahertz radiation

Frequency combs

Quantum cascade lasers

Feedback control

Microwave radiation

Mid-IR

Photon transport

Show All Keywords

Keywords/Phrases

Search In:

Publication Years