研究目的
To investigate the effect of cold finger temperature on optical pulse modulation characteristics in a 2.59 terahertz quantum cascade laser.
研究成果
The study concludes that the square input pulse requires the least magnitude current (0.83 A) at 15 K to generate pulses with minimum FWHM. Moreover, when the peak amplitude of the square input signal is 1.01 A, it generates optical pulses with the least FWHM of 19.42 ps at 45 K. In the case of the haversine input with peak amplitude of 1.8A, a peak power of 27.86 mW is generated at 15 K.
研究不足
The study is limited to numerical simulations and does not include experimental validation. The assumption of a marginal impact of the waveguides on the effective temperature of the metal cold finger may not hold in all cases.
1：Experimental Design and Method Selection:
The study uses a device-specific modeling approach to predict the optical output power under current modulation and chip temperature. Modified rate equations are used for self-consistent computation of emitted THz optical power from QCLs.
2：Sample Selection and Data Sources:
The device considered is a 90-stage far infrared QCL operating at 116 μm.
3：List of Experimental Equipment and Materials:
The QCL along with waveguide arrangement is mounted onto a copper cold finger to operate at cryogenic temperatures.
4：Experimental Procedures and Operational Workflow:
The QCL is subjected to three different input drive current waveforms, namely square, haversine and tangential hyperbolic signals. The peak amplitude of the input signal is varied at different cold finger temperatures to assess the optical pulse characteristics.
5：Data Analysis Methods:
The modified rate equations of the device are numerically solved by the Runge–Kutta method using the ordinary differential equations (ODE) solver in MATLAB, to study gain switching.
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