Beam and phase distributions of a terahertz quantum cascade wire laser
We report on both measurements and simulations of the beam profile and wavefront of a single-mode, 3.5 THz quantum cascade wire laser, incorporating a lateral corrugated metal-metal waveguide, 3rd-order distributed feedback grating. The intrinsic wavefront was measured by using a Hartmann wavefront...
| Main Authors: | , , , , , , , |
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| Andre forfattere: | |
| Format: | Article |
| Sprog: | en_US |
| Udgivet: |
American Institute of Physics (AIP)
2014
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| Online adgang: | http://hdl.handle.net/1721.1/86380 https://orcid.org/0000-0003-1982-4053 |
| Summary: | We report on both measurements and simulations of the beam profile and wavefront of a single-mode, 3.5 THz quantum cascade wire laser, incorporating a lateral corrugated metal-metal waveguide, 3rd-order distributed feedback grating. The intrinsic wavefront was measured by using a Hartmann wavefront sensor (HWS) without any optical components between the laser and HWS. Both beam profile and wavefront were simulated using an antenna array model, but taking the non-uniform electric field distribution along the waveguide into account. The results show that the non-uniform distribution along the wire laser plays a crucial role in realizing a nearly single-lobed narrow beam. The measured wavefront is spherical and agrees well with the simulation. |
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