scholarly journals Quantum Optical Aspects of High-Harmonic Generation

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 269
Author(s):  
Sándor Varró
Keyword(s):  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Strong Field ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Joint Effect ◽  
Analytic Solutions ◽  
Binding Potential ◽  
Atom Interaction ◽  
Quantum Optical

The interaction of electrons with strong laser fields is usually treated with semiclassical theory, where the laser is represented by an external field. There are analytic solutions for the free electron wave functions, which incorporate the interaction with the laser field exactly, but the joint effect of the atomic binding potential presents an obstacle for the analysis. Moreover, the radiation is a dynamical system, the number of photons changes during the interactions. Thus, it is legitimate to ask how can one treat the high order processes nonperturbatively, in such a way that the electron-atom interaction and the quantized nature of radiation be simultaneously taken into account? An analytic method is proposed to answer this question in the framework of nonrelativistic quantum electrodynamics. As an application, a quantum optical generalization of the strong-field Kramers-Heisenberg formula is derived for describing high-harmonic generation. Our formalism is suitable to analyse, among various quantal effects, the possible role of arbitrary photon statistics of the incoming field. The present paper is dedicated to the memory of Prof. Dr. Fritz Ehlotzky, who had significantly contributed to the theory of strong-field phenomena over many decades.

scholarly journals Quantum-Optical Spectrometry in Relativistic Laser–Plasma Interactions Using the High-Harmonic Generation Process: A Proposal

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 192
Author(s):  
Theocharis Lamprou ◽  
Rodrigo Lopez-Martens ◽  
Stefan Haessler ◽  
Ioannis Liontos ◽  
Subhendu Kahaly ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
Laser Field ◽  
High Harmonic ◽  
Intense Laser ◽  
Strong Laser Field ◽  
Laser Plasma Interactions ◽  
Strong Laser ◽  
Optical Spectrometry ◽  
Quantum Optical

Quantum-optical spectrometry is a recently developed shot-to-shot photon correlation-based method, namely using a quantum spectrometer (QS), that has been used to reveal the quantum optical nature of intense laser–matter interactions and connect the research domains of quantum optics (QO) and strong laser-field physics (SLFP). The method provides the probability of absorbing photons from a driving laser field towards the generation of a strong laser–field interaction product, such as high-order harmonics. In this case, the harmonic spectrum is reflected in the photon number distribution of the infrared (IR) driving field after its interaction with the high harmonic generation medium. The method was implemented in non-relativistic interactions using high harmonics produced by the interaction of strong laser pulses with atoms and semiconductors. Very recently, it was used for the generation of non-classical light states in intense laser–atom interaction, building the basis for studies of quantum electrodynamics in strong laser-field physics and the development of a new class of non-classical light sources for applications in quantum technology. Here, after a brief introduction of the QS method, we will discuss how the QS can be applied in relativistic laser–plasma interactions and become the driving factor for initiating investigations on relativistic quantum electrodynamics.

scholarly journals Quantum optical description of high-harmonic generation

2018 ◽  
Author(s):  
Νικόλαος Τσατραφύλλης
Keyword(s):  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Quantum Optical

Ο σκοπός αυτής της διατριβής, είναι η κβαντική–οπτική περιγραφή της αλληλεπίδρασης ισχυρού πεδίου λέϊζερ–ατόμου. Χρησιμοποιώντας μία πλήρη κβαντομηχανική προσέγγιση (πιο συγκεκριμένα, θεωρώντας σύμφωνη κατάσταση για το πεδίο του λεϊζερ) για την περιγραφή των αρμονικών υψηλής τάξης, παραγώμενες από την αλληλεπίδραση ενός ισχυρού υπέρυθρου πεδίου λεϊζερ με άτομα, καταγράψαμε το φάσμα των αρμονικών χωρίς τη χρήση συμβατικού φασματόμετρου ακραίας υπεριώδους φασματικής περιοχής. Αυτό επιτεύχθηκε, με τη χρήση στατιστικής φωτονίων στην κατάσταση του υπέρυθρου φωτός που εξέρχεται από το αέριο μέσο. Βρέθηκε ότι η ακτινοβολία έχει μια ξεχωριστή μη–κλασσική συμπεριφορά, καθώς η κατανομή φωτονίων αποτελείται από μία σειρά καλά καθορισμένων κορυφών, οι οποίες αντιστοιχούν στο φάσμα των αρμονικών υψηλής τάξης. Αυτή η εργασία συνθέτει τα πεδία της φυσικής ισχυρού πεδίου και κβαντικής οπτικής και ανοίγει το δρόμο για μελέτες στην επιστήμη των αττοδευτερολέπτων, χρησιμοποιώντας συμβατικά διαγνωστικά υπέρυθρης ακτινοβολίας.

scholarly journals The quantum-optical nature of high harmonic generation

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Alexey Gorlach ◽  
Ofer Neufeld ◽  
Nicholas Rivera ◽  
Oren Cohen ◽  
Ido Kaminer
Keyword(s):  
Nonlinear Optics ◽  
Harmonic Generation ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Frequency Component ◽  
Dipole Approximation ◽  
Frequency Combs ◽  
Wide Range ◽  
Quantum Phenomena ◽  
Quantum Optical

Abstract High harmonic generation (HHG) is an extremely nonlinear effect generating coherent broadband radiation and pulse durations reaching attosecond timescales. Conventional models of HHG that treat the driving and emitted fields classically are usually very successful but inherently cannot capture the quantum-optical nature of the process. Although prior work considered quantum HHG, it remains unknown in what conditions the spectral and statistical properties of the radiation depart considerably from the known phenomenology of HHG. The discovery of such conditions could lead to novel sources of attosecond light having squeezing and entanglement. Here, we present a fully-quantum theory of extreme nonlinear optics, predicting quantum effects that alter both the spectrum and photon statistics of HHG, thus departing from all previous approaches. We predict the emission of shifted frequency combs and identify spectral features arising from the breakdown of the dipole approximation for the emission. Our results show that each frequency component of HHG can be bunched and squeezed and that each emitted photon is a superposition of all frequencies in the spectrum, i.e., each photon is a comb. Our general approach is applicable to a wide range of nonlinear optical processes, paving the way towards novel quantum phenomena in extreme nonlinear optics.

THz-driven strong-field dynamics in solids: High-harmonic generation and quasiparticle collisions

2017 ◽  
Author(s):  
F. Langer ◽  
M. Hohenleutner ◽  
C.P. Schmid ◽  
S. Schlauderer ◽  
U. Huttner ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Strong Field ◽  
High Harmonic ◽  
High Harmonic Generation

scholarly journals Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tobias Heinrich ◽  
Marco Taucer ◽  
Ofer Kfir ◽  
P. B. Corkum ◽  
André Staudte ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Harmonic Generation ◽  
Strong Field ◽  
Condensed Matter ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Nonlinear Spectroscopy ◽  
Field Methods ◽  
Circularly Polarized ◽  
Symmetry Properties

AbstractStrong-field methods in solids enable new strategies for ultrafast nonlinear spectroscopy and provide all-optical insights into the electronic properties of condensed matter in reciprocal and real space. Additionally, solid-state media offers unprecedented possibilities to control high-harmonic generation using modified targets or tailored excitation fields. Here we merge these important points and demonstrate circularly-polarized high-harmonic generation with polarization-matched excitation fields for spectroscopy of chiral electronic properties at surfaces. The sensitivity of our approach is demonstrated for structural helicity and termination-mediated ferromagnetic order at the surface of silicon-dioxide and magnesium oxide, respectively. Circularly polarized radiation emanating from a solid sample now allows to add basic symmetry properties as chirality to the arsenal of strong-field spectroscopy in solids. Together with its inherent temporal (femtosecond) resolution and non-resonant broadband spectrum, the polarization control of high harmonics from condensed matter can illuminate ultrafast and strong field dynamics of surfaces, buried layers or thin films.

Quantum Electrodynamics Basis of Classical-Field High-Harmonic Generation Theory

2001 ◽  
Vol 18 (9) ◽  
pp. 1196-1198 ◽  
Author(s):  
Wang Bing-Bing ◽  
Li Xiao-Feng ◽  
Gao Liang-Hui ◽  
Fu Pan-Ming ◽  
Guo Dong-Sheng ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Quantum Electrodynamics ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Classical Field ◽  
Generation Theory
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