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Wide range tuning of external cavity bent-waveguide laser diode
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10.1063/1.3658257
/content/aip/journal/jap/110/9/10.1063/1.3658257
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/9/10.1063/1.3658257

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Schematic view of our external cavity setup (in case of the SAF 1126-55-90 laser). Light from the bent-waveguide laser is collimated and reflected from the diffraction grating and from the mirror. The first order diffraction goes back to the laser (Littrow configuration) and the zeroth order is our output beam. For the temperature tuning the laser and the collimating lens are placed in a cryostat, for pressure tuning they are placed in an optical pressure cell.

Image of FIG. 2.
FIG. 2.

(Color online) Emission spectra of the SAF 1126-55-90 chip with semi-transparent mirror (black) and with the grating in Littrow configuration (red).

Image of FIG. 3.
FIG. 3.

(Color online) Emission spectra (in logarithmic scale) of the SAF 1126-55-90 laser tuned (from the front side) by grating at different temperatures. The individual emission peaks correspond to different angular positions of the grating. The spectra were obtained for the maximum operating current of 300 mA.

Image of FIG. 4.
FIG. 4.

(Color online) Threshold currents of the SAF 1126-55-90 laser tuned (from the front side) by grating at different temperatures.

Image of FIG. 5.
FIG. 5.

(Color online) Emission spectra (in logarithmic scale) of the SAF 1126-55-10 laser tuned (from the back side) by grating at different temperatures. The individual emission peaks correspond to different angular positions of the grating. The spectra were obtained for the maximum operating current of 300 mA.

Image of FIG. 6.
FIG. 6.

(Color online) Threshold currents of the SAF 1126-55-10 laser tuned (from the back side) by grating at different temperatures.

Image of FIG. 7.
FIG. 7.

(Color online) Temperature dependence of threshold currents (for SAF 1126-55-90) with the grating replaced by a semi-transparent mirror reflecting 20%. Straight line represents the linear approximation characteristic for radiative recombination. The exponential increase at temperatures above 220 K is due to Auger recombination.

Image of FIG. 8.
FIG. 8.

(Color online) Schematic view of the experimental setup for pressure tuning in the external cavity. The output beam from the pressure cell is convergent and is collimated by an external lens.

Image of FIG. 9.
FIG. 9.

(Color online) Emission spectra of the laser tuned by the grating at different pressures (in logarithmic scale). The individual emission peaks correspond to different angular positions of the grating. The spectra were obtained for the maximum operating current of 300 mA.

Image of FIG. 10.
FIG. 10.

(Color online) Threshold currents (at different pressures) for the laser tuned by the grating.

Image of FIG. 11.
FIG. 11.

(Color online) Transition energies in the InGaAsP quantum well as a function of pressure.

Image of FIG. 12.
FIG. 12.

(Color online) Gain spectra for different carrier concentrations in the InGaAsP quantum well.

Image of FIG. 13.
FIG. 13.

Pressure (a) and temperature (b) variation of threshold concentration nth.

Image of FIG. 14.
FIG. 14.

(Color online) Modal gain at threshold for the InGaAsP laser for different temperatures (at ambient pressure). The corresponding threshold concentrations are shown in Fig. 13(b).

Image of FIG. 15.
FIG. 15.

(Color online) Modal gain at threshold for the InGaAsP laser for different pressures (at room temperature). The corresponding threshold concentrations are shown in Fig. 13(a).

Image of FIG. 16.
FIG. 16.

(Color online) Threshold currents for wavelength tuning at different temperatures. Points are experimental, curves are theoretical.

Image of FIG. 17.
FIG. 17.

(Color online) Threshold currents for wavelength tuning at different pressures. Points are experimental, curves are theoretical.

Tables

Generic image for table
Table I.

Material parameters used in the calculations. In the first row the expression for the energy gap as a function of pressure and temperature is given.

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/content/aip/journal/jap/110/9/10.1063/1.3658257
2011-11-04
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Wide range tuning of external cavity bent-waveguide laser diode
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/9/10.1063/1.3658257
10.1063/1.3658257
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