-
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate laser action from a waveguide fabricated in an Er:Yb-doped silicate glass using femtosecond laser inscription. Waveguides were fabricated using a diode-pumped Yb:glass oscillator at a 600-kHz repetition rate. The multiscan technique was used to control the waveguide cross section. Textbook threshold characteristics are observed for both 980 nm and dual-wavelength excitation.
IEEE Photonics Technology Letters 02/2008; · 2.19 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A time-dependent theory has been developed to model the behavior of doped-InSb, optically bistable etalons operating at room temperature and illuminated by a pulsed CO 2 laser. Good agreement can be obtained between this semi-empirical theory and experiment. The reduction of switching times to ∼ 1 ns by n-type doping has been demonstrated experimentally.
IEEE Journal of Quantum Electronics 12/1987; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report the first observation of quasi-steady-state optical bistability in an InSb etalon at room temperature as a result of the generation of free carriers through two photon absorption of 10 μm radiation. Nonlinear tuning of the etalon through two free spectral ranges has been achieved, with bistability observed around the two cavity resonances. Switching from a low to high transmission state has been achieved in times less than 10 ns while switching in the opposite direction occurs within 50-100 ns. The experimental results have been successfully fitted to a numerical model of the device.
IEEE Journal of Quantum Electronics 03/1986; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report the first observation of quasi-steady state optical bistability in a 360 μm thick, uncoated Cd 0.23 Hg 0.77 Te etalon at room temperature as a result of the generation of free carriers through two photon absorption of pulsed 10.6 μm radiation from a hybrid TEA CO 2 laser (FWHM = 1.75 μs). The experimental results are compared with the predictions of a computer model.
IEEE Journal of Quantum Electronics 10/1985; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The current status of hybrid and injection-locked single-mode TEA CO 2 laser systems is examined in relation to two important applications. It is argued that the operational characteristics of injection-locked systems are particularly well-suited for LIDAR applications and that the properties of hybrid devices impose a strong bias toward nonlinear optics applications, in particular, optical signal processing research.
IEEE Journal of Quantum Electronics 05/1985; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report a detailed study of time resolved self-defocusing in InSb at room temperature, using 3 μs long CO 2 laser pulses. We have determined that the intensity dependence of the refractive index varies as intensity to the two-thirds power. The measured values correspond to an equivalent dn/dI of -0.11 cm<sup>2</sup>/MW at an incident intensity of 210 kW/cm<sup>2</sup>.
IEEE Journal of Quantum Electronics 02/1985; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Electron-plasma-induced chirping phenomena are incorporated into a quantitative theoretical treatment of an injection-locked compact TEA CO 2 laser. For the first time, inferred estimates of both the magnitude and sense of the single mode detuning range asymmetry about resonance are shown to agree with experimentally derived data. Conditions for chirp-free operation are discussed and demonstrated.
IEEE Journal of Quantum Electronics 02/1985; · 1.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Multikilowatt mid infrared emission with high pump photon conversion efficiency (∼ 15 percent) has been obtained by difference frequency generation in CdGeAs 2 utilizing the double wavelength output from a grating tuned twin-cavity TEA CO 2 system, one signal of which is frequency doubled to provide efficient synchronized sources for both pump and idler. Tuning over a spectral range 8-14 mu m can be achieved and further extended to 17 μm using 12.8 μm emission from an efficient TEA CO 2 pumped NH 3 laser.
IEEE Journal of Quantum Electronics 09/1982; · 1.88 Impact Factor
-
A.P. Caricato,
A. Fazzi,
A. Jha, A. Kar,
G. Leggieri,
A. Luches,
M. Martino,
F. Romano,
S. Shen,
M. Taghizadeh,
R. Thomson,
T. Tunno
[show abstract]
[hide abstract]
ABSTRACT: Er-doped oxyfluoride silicate thin films were deposited using pulsed laser deposition. The target glass composition was 65SiO2– 3Al2O3–12Na2O–10PbF3–10LaF3 (in mol%) + 1Er2O3 (in wt.%). Irradiations were performed using an ArF excimer laser in a dynamic flow of oxygen of pressure 5 Pa. The laser fluence at the target surface was 2 J/cm2. Films were deposited on pure silica substrates, either at room temperature or on a substrate-holder heated at 200 °C. The optical transmission of the films in the NIR–visible–UV regions (200–2500 nm) was recorded using a double beam spectrophotometer and was higher than 90%. The optical spectra were analyzed using computer code to evaluate the refraction index (n), the extinction coefficient (k) along with the film thickness. The films deposited at room temperature were cracked whilst examined under scanning electron microscopy and reactive ion etching. By comparison, the films deposited at 200 °C remained undamaged. Optical waveguides were written on the films deposited at 200 °C using dry reactive ion etching with attenuation in the range of 0.74 dB/cm at 633 nm, measured using a prism coupler.
Optical Materials. 29(9):1166-1170.
