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레이저 다이오드 QCL

양자 폭포 레이저(Quantum Cascade Laser)는 중적외선 범위에서 빛을 방출하는 광원입니다.

QC-ET Extended Tuning DFB Source

Alpes Lasers offers two types of extended tuning devices, both of which allow rapid tuning at fixed temperature in a wider range than standard DFB lasers. The QC-ET (described here) allows fully continuous tuning over 0.4% of the central wavelength, while the QC-XT allows piece-wise continuous tuning over 2% of the central wavelength.

QC-ET Extended Tuning Lasers use a dual current control to extend the mode-hop free tuning to more than 0.4% of the central wavelength (>6 cm-1 at 1270 cm-1). While the first laser input allows direct intensity modulation in the same manner as standard DFB lasers, the integrated heater current IT allows to offset the wavelength much faster than the temperature change of the heatsink temperature would do.

 

 

Key Benefits:

 

- Increased wavelength scanning span fully electrically

(Increased electrical wavelength scan)

- Wavelength dither and ramps as in conventional DFB

- DFB wavelength reproducibility

- DFB quality linewidth and noise

 

QC-ET Extended Tuning_1.png

Sample datasheets

Take a look at these two sample datasheets to see how these ET-QCLs can be used, or read the following paper in Optics Express:

 - A. Bismuto, Y. Bidaux, C. Tardy, R. Terazzi, T. Gresch, J. Wolf, S. Blaser, A. Muller, and J. Faist, “Extended tuning of mid-ir quantum cascade lasers using integrated resistive heaters,” Optics Express, vol. 23, no. 23, p. 29715, Nov. 2015

 

 

QC-ET Extended Tuning_2.png

 

You can see in the picture on the right the extent of the range of a typical QC-ET laser compared to a standard DFB laser. By integrating the heater monolithically the entire range can be accessed at a fixed temperature.
 
 
 
 

QC-ET Extended Tuning_3.png

The current and amplitude in the laser and resistor can be combined to change the tuning range. Frequency tuning is maximized when the modulations are in phase and minimized when they are out of phase.
 
 
 
 
 

QC-ET Extended Tuning_4.png

This type of modulation can be used to taylor the ratio of frequency and amplitude modulation to your experiment.