By Dr. Jungsang Kim, Dr. Seema Somani, Professor Yoshihisa Yamamoto (auth.)
The quantum statistical homes of the sunshine wave generated in a semiconductor laser or a light-emitting diode (LED) has been a box of excessive study for greater than a decade. This study monograph discusses contemporary examine actions in nonclassical mild new release in keeping with semiconductor units. This quantity consists of 4 significant elements. the 1st discusses the new release of sub-shot-noise mild in macroscopic pn junction light-emitting units, together with semiconductor laser and light-emitting diodes. the second one half discusses the applying of squeezed gentle in high-precision size, together with spectroscopy and interferometry. The 3rd half addresses the Coulomb blockade impression in a mesoscopic pn junction and the new release of unmarried photon states. The final half covers the detection of unmarried photons utilizing a visual mild photon counter.
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Extra info for Nonclassical Light from Semiconductor Lasers and LEDs
1b. The opposite is true at the dark fringe. Similarly, for Δl = 2Δl0 , Δφ for adjacent modes diﬀers by 2π; thus, the fringes of all the modes overlap again. Therefore, by setting the arm-length diﬀerence Δl to c/(2Δf ), we can discriminate between longitudinal modes and measure the longitudinal-modepartition noise with the highest eﬃciency. 2 shows the experimental setup for measuring the longitudinalmode-partition noise of semiconductor lasers using a Mach–Zehnder interferometer. The laser output was injected into a Mach–Zehnder interferometer with the arm-length diﬀerence Δl = c/(2Δf ).
As the driving current increases, the squeezing bandwidth is limited by the carrier recombination lifetime and saturates at ∼560 kHz. For the smallestarea LED, the squeezing bandwidth increases above this value at higher driving currents. This is attributed to the carrier-concentration-dependent radiative lifetime. At higher current densities, the carrier density in the active region increases, and the carrier lifetime is shortened . This results in the increased squeezing bandwidth. 700 600 30 Squeezing Bandwidth (kHz) 800 700 600 500 400 300 200 100 0 10 15 20 25 30 35 40 Squeezing Bandwidth (kHz) Squeezing Bandwidth (kHz) 3.
The signal power is proportional to the square of RL . The total noise in this measurement is the sum of the thermal noise generated at RL and the input noise of the ampliﬁer used. 5) where Iph is the photocurrent, F < 1 characterizes the amount of squeezing, and Samp is the input noise power spectral density of the ampliﬁer. When the ampliﬁer input noise, Samp , is small compared with the thermal noise of the load resistor, the SNR is proportional to the load resistor used. A high impedance front-end design using a 10 kΩ load resistance was used to improve the SNR.