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Continuous-wave subwavelength microdisk lasers at λ = 1.53 µm
Mon, 2010-08-30 02:00 — GuestZhijun Liu, Jeffrey M. Shainline, Gustavo E. Fernandes, Jimmy Xu, Jianxin Chen, Claire F. Gmachl
Subwavelength InGaAs/AlInAs microdisk lasers are demonstrated under continuous-wave optical pumping at a heat-sink temperature of 45 K. A 1.49 µm diameter, 209 nm thick microdisk lases in single-mode at a wavelength of 1.53 µm, which is identified as the whispering-gallery mode with the ... [Opt. Express 18, 19242-19248 (2010)]
Small-signal analysis of bidirectional operating characteristics in a Raman ring laser with external optical injections
Mon, 2010-08-30 02:00 — GuestZhang Luo, Xiaodong Yuan, Weimin Ye, Chun Zeng, Jiarong Ji
Employing the small-signal analysis, we study the bidirectional operating characteristics in a Raman ring laser. Bidirectional operation is found not stable in a silicon ring because of the existence of two-photon absorption. Using polar crystals which have different forward and backward Raman gain ... [Opt. Express 18, 19407-19412 (2010)]
Broadly tunable high-power InAs/GaAs quantum-dot external cavity diode lasers
Mon, 2010-08-30 02:00 — GuestKsenia A. Fedorova, Maria Ana Cataluna, Igor Krestnikov, Daniil Livshits, Edik U. Rafailov
A record broadly tunable high-power external cavity InAs/GaAs quantum-dot diode laser with a tuning range of 202 nm (1122 nm-1324 nm) is demonstrated. A maximum output power of 480 mW and a side-mode suppression ratio greater than 45 dB are achieved in the central part of the tuning range. We ... [Opt. Express 18, 19438-19443 (2010)]
Femtosecond laser induced surface nanostructuring and simultaneous crystallization of amorphous thin silicon film
Mon, 2010-08-30 02:00 — GuestX. C. Wang, H. Y. Zheng, C. W. Tan, F. Wang, H. Y. Yu, K. L. Pey
Ultrafast pulsed laser irradiation is demonstrated to be able to produce surface nano-structuring and simultaneous crystallization of amorphous silicon thin film in one step laser processing. After fs laser irradiation on 80 nm-thick a-Si deposited on Corning 1737 glass substrate, the color change ... [Opt. Express 18, 19379-19385 (2010)]
Spectroscopic photoacoustic microscopy using a photonic crystal fiber supercontinuum source
Mon, 2010-08-30 02:00 — GuestYazan N. Billeh, Mengyang Liu, Takashi Buma
Photoacoustic microscopy (PAM) provides high resolution images with excellent image contrast based on optical absorption. The compact size and high repetition rate of pulsed microchip lasers make them attractive sources for PAM. However, their fixed wavelength output precludes their use in ... [Opt. Express 18, 18519-18524 (2010)]
Actively Q-switched 1.6-mJ tapered double-clad ytterbium-doped fiber laser
Mon, 2010-08-30 02:00 — GuestJuho Kerttula, Valery Filippov, Yuri Chamorovskii, Konstantin Golant, Oleg G. Okhotnikov
We have demonstrated an actively Q-switched tapered double-clad fiber laser capable of single-shot generation of 1.6-mJ, 64-ns pulses. The active medium based on tapered double-clad fiber is shown to exhibit a reduced level of amplified spontaneous emission which allows for high-energy pulse ... [Opt. Express 18, 18543-18549 (2010)]
Distributed-feedback-laser-based NICE-OHMS in the pressure-broadened regime
Mon, 2010-08-30 02:00 — GuestAleksandra Foltynowicz, Junyang Wang, Patrick Ehlers, Ove Axner
A compact noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) system based on a narrow linewidth distributed-feedback laser and fiber-coupled acousto-optic and electro-optic modulators has been developed. Measurements of absorption and dispersion signals have been ... [Opt. Express 18, 18580-18591 (2010)]
Highly sensitive bending sensor based on Er^3+-doped DBR fiber laser
Mon, 2010-08-16 02:00 — GuestWeisheng Liu, Tuan Guo, Allan Chi-lun Wong, Hwa-Yaw Tam, Sailing He
A short cavity Er^3+-doped distributed-Bragg-reflector (DBR) fiber laser with a low polarization beat frequency has been demonstrated for bending measurement. The polarization beat frequency of the DBR laser is extremely sensitive to bending and can measure curvature changes as small as 1.8 × ... [Opt. Express 18, 17834-17840 (2010)]
Design of an integrated hardware interface for AOSLO image capture and cone-targeted stimulus delivery
Mon, 2010-08-16 02:00 — GuestQiang Yang, David W. Arathorn, Pavan Tiruveedhula, Curtis R. Vogel, Austin Roorda
We demonstrate an integrated FPGA solution to project highly stabilized, aberration-corrected stimuli directly onto the retina by means of real-time retinal image motion signals in combination with high speed modulation of a scanning laser. By reducing the latency between target location prediction ... [Opt. Express 18, 17841-17858 (2010)]
Fifteen terawatt picosecond CO_2 laser system
Mon, 2010-08-16 02:00 — GuestD. Haberberger, S. Tochitsky, C. Joshi
The generation of a record peak-power of 15TW (45J, 3ps) in a single CO_2 laser beam is reported. Using a master oscillator–power amplifier laser system, it is shown that up to 100J of energy can be extracted in a train of 3ps laser pulses separated by 18ps, a characteristic time of the CO_2 ... [Opt. Express 18, 17865-17875 (2010)]
