The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 36, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • Preface to Topical Papers on Trends in Tunable Mid-Infrared Laser Devices and their Applications
    Shigeru YAMAGUCHI
    2008 Volume 36 Issue 2 Pages 57
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.57
    JOURNAL FREE ACCESS
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  • Mid-Infrared Semiconductor Quasi-Phase-Matching Wavelength-Conversion Devices
    Takashi KONDO, Ikuma OHTA, Tomonori MATSUSHITA
    2008 Volume 36 Issue 2 Pages 58-63
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.58
    JOURNAL FREE ACCESS
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    Recent progress of semiconductor-based quasi-phase-matching (QPM) wavelength conversion devices is reviewed.Compound semiconductors are promising materials for generating coherent light in the mid-infrared (IR) region because of their transparencies in the long-wave IR range and high second-order nonlinearities.Bulk-type and waveguide-type QPM devices have been developed using Ga As, and their high potentials are now being demonstrated. Wider-bandgap semiconductors are also studied as materials for the next-generation wavelength conversion devices.
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  • Highly Efficient Mid-Infrared Difference Frequency Generation Using a Quasi-Phase Matched Li NbO3 Ridge Waveguide
    Osamu TADANAGA, Tsutomu YANAGAWA, Yoshiki NISHIDA, Masaki ASOBE, Hiroy ...
    2008 Volume 36 Issue 2 Pages 64-69
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.2_64
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    A laser source in mid-infrared (IR) range is needed for gas sensing because this wavelength range includes a large number of fundamental absorption bands of various atmospheric pollutants. Difference frequency generation (DFG) using quasi-phase matched Li NbO3 (QPM-LN) waveguides are promising for these laser source.In this review, we describe DFG characteristics of fabricated QPM-LN waveguides using direct-bonding technique.We achieved 40 and 100 %/W conversion efficiency for 3.2 and 2.3μm generation, respectively. Then, we demonstrated CH4 gas and 12CO/13CO isotopomer measurement using these waveguides. We also describe wavelength conversion module using V-groove connection technique. Finally, we report compact sub-m W mid-IR laser source, which did not employ a fiber amplifier or a high power solid-state laser.
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  • Semiconductor Material Systems for Quantum Cascade Lasers
    Keita OHTANI, Hideo OHNO
    2008 Volume 36 Issue 2 Pages 70-74
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.70
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    Quantum cascade lasers (QCLs) are long-wavelength and high-power semiconductor lasers employing carrier recycling in an active region. Since this laser utilizes an intersubband transition in quantum well structures, fundamental properties such as the laser emission wavelength are dependent on the design of structures. However ultimate laser performance depends not only on designing the structures but also on material properties. Here we have discussed semiconductor material systems suitable for the operation of QCLs. The material properties, which have an influence on laser characteristics, are presented and compared with the laser performance of state-of-art QCLs composed by the different kinds of materials. Finally we have described our recent results using In As/AISb which has material properties advantageous for the operation of QCLs.
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  • Development of DFB Quantum Cascade Lasers and their Applications
    Tadataka EDAMURA, Naota AKIKUSA, Atsushi SUGIYAMA, Takahide OCHIAI, Ka ...
    2008 Volume 36 Issue 2 Pages 75-79
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.75
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    We have developed single-mode quantum cascade lasers (QCLs) emitting at 5.2μm and 7.7 Em. Single-mode emission with narrow line width is achieved using a distributed feedback (DFB) technology. A narrow line width is interpreted in terms of an extremely small effective coupling efficiency of spontaneous emission, caused by ultrafast nonradiative scatterings. We have demonstrated absorption signal detection of NO, N2O, and CH4. The highest spectral resolution can be achieved with a CW mode DFB-QCL. We have observed lines of isotopomer of nitrous oxide, and signal detection limit is about 50 ppb.
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  • Performance Characteristics of a Compact Widely Tunable External Cavity Quantum Cascade Laser
    Michael PUSHKARSKY, Miles WEIDA, Timothy DAY, David ARNONE, Russ PRITC ...
    2008 Volume 36 Issue 2 Pages 80-83
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.80
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    Daylight Solutions is developing broadly tunable, external cavity quantum cascade lasers (EC-QCLs) for gas sensing instrumentation. Recent efforts at Daylight Solutions yielded the world's first miniature room temperature EC-QCLs comprising a 15 mm long optical cavity, miniature grating tuning mechanism and integrated current and temperature controls. The laser operates in the 4.5-10.5μm spectral region with a scanning range up to 100 cm-1. Spectral resolution is better than 1 cm-1 and scanning rate is faster than 1 second. In addition to the relative simplicity and ruggedness of the opto-mechanical design, the laser also features low power consumption, does not require precise current and temperature control, and operates at room temperature with convective cooling. The prototype QCL-based acetone sensor has shown a sensitivity of 100 ppb. In parallel, a continuously tunable CW broadly external cavity QCL laser prototype was developed. The CW laser performance was evaluated by recording ammonia spectrum.
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  • Wavelength Stability of Rapid and Random Wavelength-Tuned Mid-Infrared Coherent Light Source and Application to Imaging
    Masaki YUMOTO, Yasuhiro MAEDA, Norihito SAITO, Takayo OGAWA, Masafumi ...
    2008 Volume 36 Issue 2 Pages 84-88
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.84
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    We have realized a rapid and random wavelength-tuned mid-infrared laser with difference-frequency generation (DFG) pumping using the two wavelengths oscillated from Ti: sapphire laser. In the experiment, a wavelength region from 5μm to 12μm is realized. The wavelength stability of the mid-infrared radiation was measured to be less than ±1.1×10-3 μm. We realized a fastest wavelength switching speed of 1 ms. As demonstration, the real-time absorption measurements of water and liquid acetone were performed. The results show that the electronically tuned mid-IR laser is attractive for real-time imaging in the mid-IR region.
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  • Design Considerations of a RF-Pumped High-Power CO2 Laser with a W-Axicon Type Optical Resonator
    Naoomi MIYAKAWA, Shigeru YAMAGUCHI, Tomoo FUJIOKA
    2008 Volume 36 Issue 2 Pages 89-92
    Published: February 15, 2008
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.36.89
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    Existing types of industrial CO2 lasers are compared with each other as well as with YAG and fiber lasers. An RF-excited wide-area cylindrical-electrode CO2laser with W-axicon and toric mirrors is proposed.
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