Optically Pumped Type-II Mid-Infrared Tunable Distributed Feedback Lasers

Optically-pumped type-II mid-infrared index-coupled tunable distributed feed- back (DFB) semiconductor lasers have been developed to provide continuous-wave (CW) single longitudinal mode (SLM) operation with features including narrow spec- tral linewidth, high output power, good beam quality and wide continuous wave- length tunability for applications such as remote sensing or spectroscopy in the 3 to 5 μm midwave-infrared range of atmospheric transmission window. In the demonstration of this type of laser, a hyperbolically chirped grating was patterned using interferometric lithography (IL) with spherical wavefronts which was then transferred into the top clad of the slab waveguide epi-structure of the laser de- vice. Wavelength tuning is achieved by translationally projecting pump stripe at di\ufb00erent positions of this chirped grating on the laser device, thus di\ufb00erent grat- ing periods along the pump stripe at di\ufb00erent pump positions select di\ufb00erent las- ing wavelengths. Primary results were acquired on one device of 4 mm in lateral dimension with continuously tuning range of about 80 nm centered at 3100 nm, single facet output power of 830 mW and typical spectral linewidth of 1.2 nm at 2.5xthreshold pumping. Fabry-Perot (F-P) interferometer was used as arti\ufb01cial tar- get gas to demonstrate potential application of gas spectroscopy with this type of laser.

Name thesis:degree_name

Optical Science and Engineering

Level thesis:degree_level

Doctoral

Discipline thesis:degree_discipline

Optical Science and Engineering

Year

2014

Author dc:creator

• He, Xiang

Contributors dc:contributor

• Brueck, Steven
• Sheik-Bahae, Mansoor
• Kaspi, Ron
• Hayat, Majeed
• Eliseev, Petr

Language dc:language

English

Identifier

https://digitalrepository.unm.edu/ose_etds/7

OAI identifier oai:identifier

oai:digitalrepository.unm.edu:ose_etds-1006