TUNABLE INFRARED LASERS FOR GAS-PHASE SPECTROSCOPY
First Claim
1. A tunable laser device comprising:
- a chirped distributed feedback (DFB) grating disposed on an optically pumped laser structure; and
a pump laser disposed to provide a pump beam illumination in a sub-area with respect to an area covered by the chirped DFB grating, the position being changed to allow a continuous tuning of a lasing emission wavelength from the optically pumped laser structure.
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Abstract
Exemplary embodiments provide tunable laser devices, methods for making the laser devices and methods for tuning the laser devices. The tunable laser devices can include an optically pumped semiconductor laser heterostructure, on which a distributed-feedback (DFB) laser grating having variable grating spacings (or chirps) can be formed. The optically pumped semiconductor laser heterostructure can be an optically pumped type-II quantum well laser structure. The emission wavelength of the tunable laser devices can be tuned by changing positions of the region illuminated by the pump laser and with respect to the chirped DFB grating. The disclosed laser devices and methods can provide tunable laser emission with a combination of narrow linewidth and high output power that can be used for remote sensing applications and/or spectroscopic applications across the entire mid infrared (IR) spectral region.
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Citations
24 Claims
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1. A tunable laser device comprising:
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a chirped distributed feedback (DFB) grating disposed on an optically pumped laser structure; and a pump laser disposed to provide a pump beam illumination in a sub-area with respect to an area covered by the chirped DFB grating, the position being changed to allow a continuous tuning of a lasing emission wavelength from the optically pumped laser structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for tuning a laser emission wavelength comprising:
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providing an optically pumped laser structure; forming a chirped distributed feed-back (DFB) grating on the optically pumped laser structure using an interferometric lithography; and changing a position of a pump beam relative to the chirped DFB grating to tune a laser emission wavelength. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A laser source for gas sensing comprising:
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a chirped DFB grating disposed on an optically pumped laser structure, wherein the optically pumped laser structure emits in a mid-IR wavelength range; and an optical arrangement comprising a pump beam that samples the chirped DFB grating at a plurality of locations, such that a single longitudinal mode emission is tuned to perform a spectroscopy of an absorbing media. - View Dependent Claims (22, 23, 24)
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Specification