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Schematics of the differential detector setup. ͑ a ͒ The concept of the measurement. A Ti:sapphire beam is split into equal parts by a Wollaston prism ͑ WP ͒ . The two beams are then focused on the two photodiodes of the detector. ͑ b ͒ A schematic of the electronics of the detector. The two photodiodes are each reversed biased with a voltage V bias . The difference in the
Source publication
In electro-optic detection of terahertz transients, the photodiodes of a differential detector are often illuminated with optical powers on the order of several milliwatts. We present measurements that show that the response of the photodiodes at these power levels is distorted, giving rise to frequency-dependent amplitude and phase changes in the...
Contexts in source publication
Context 1
... setup for measuring the noise from the differential- detector setup is shown in Fig. 2a. In this setup a beam from the Ti:sapphire oscillator is split into two beams, hav- ing equal power, by a Wollaston prism. Each beam is focused onto one of the photodiodes of a differential detector. Figure 2b shows a schematic of this detector. Both BPW34s sili- con PIN photodiodes are reversed-biased with a 5 V volt- age. The ...
Context 2
... beam is focused onto one of the photodiodes of a differential detector. Figure 2b shows a schematic of this detector. Both BPW34s sili- con PIN photodiodes are reversed-biased with a 5 V volt- age. ...
Context 3
... Instrum. 76, 073104 2005 less than 5% and the phase distortion was less than 2°. It is clear from the previous results that the response of the photodiode changes drastically under high levels of illu- mination. To study the effect of this on differential detection, we show in Fig. 5 the noise spectra of the differential detec- tor described in Fig. 2, measured for different values of the power of the Ti:sapphire ...
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