NDLI: Modes, emission beams and losses of THz heterostructure disk lasers: single-mode laser with vertical beam option

Content Provider	IET Digital Library
Author	Andronov, A. A. Dodin, E. P. Nozdrin, Yu. N. Pozdnyakova, V. I. Sadofiev, Yu. G. Fefelov, A. G.
Abstract	Properties of disk cavities for terahertz (THz) heterostructure lasers are discussed basing on observation of emission and beam from THz quantum cascade disk laser and analytical evaluation of modes, beams and losses of the laser disk cavities. The measured laser beam has beam peak at about 30° from vertical. To find condition for vertically emitted beam and for evaluation of the laser modes, emission beams and losses simple approach adopted in theory of slit (patch) antennas is used. With this approach results on observed laser beam are discussed and a possibility to create single-frequency disk laser with narrow vertical beam. This can be achieved if only single TEM1m cavity mode is exited. Several examples of such possibility for 100 µm wavelength with disk cavities from 18 to 200 µm in diameter and with cascade thickness 10 µm are presented. Depending on the diameter the cavity emission losses are higher than or of about that of THz quantum cascade laser waveguide losses or amplification. For wavelength longer than 100 µm and (or) with lower cascade thickness, the losses go down and cavity could be optimised for creation a single-mode powerful vertically emitted disk laser.
Starting Page	383
Ending Page	385
Page Count	3
ISSN	00135194
Volume Number	52
e-ISSN	1350911X
Issue Number	Issue 5, Mar (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/52/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2015.4033
Journal	Electronics Letters
Publisher Date	2016-02-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Design of Specific Laser System Emission Beam Laser Beam Laser Beam Characteristic And Interactions Laser Beam Interactions And Property Laser Cavity Resonator Laser Disk Cavities Laser Mode Laser Resonator And Cavities Lasing Action in SemiConductor Optical Loss Patch Antenna Quantum Cascade Lasers Semiconductor Laser Single Mode Laser Single TEM1m Cavity Mode Single-frequency Disk Laser Single-mode Powerful Vertically Emitted Disk Laser Slit Antenna Surface Emitting Laser Diode THz Heterostructure Disk Lasers THz Quantum Cascade Disk Laser THz Quantum Cascade Laser Waveguide Amplification THz Quantum Cascade Laser Waveguide Loss Vertical Beam Waveguide Lasers Wavelength 18 Mum to 200 Mum
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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