DAC-board based X-band EPR spectrometer with arbitrary waveform control.
DAC-board based X-band EPR spectrometer with arbitrary waveform control.
复制标题
DOI：
10.1016/j.jmr.2013.07.015
复制
发表时间：
2013-10
影响因子：
2.2
通讯作者：
Han, Songi
中科院分区：
文献类型：
--
作者：
Kaufmann, Thomas;Keller, Timothy J.;Franck, John M.;Barnes, Ryan P.;Glaser, Steffen J.;Martinis, John M.;Han, Songi
关键词：
我们提出了对均匀自旋系统的任意控制，它在一台简单的自制电子顺磁共振(EPR)谱仪上演示，工作在8-10 GHz(X波段)，由1 GHz任意波形发生器(AWG)控制，动态范围为42分贝(即14位)。这种光谱仪可以相对容易地由单个DAC(数模转换器)板和少量库存组件构成，并提供强大的自动数字校准和校正例程功能，使其能够生成具有精确幅度和相位控制的成形X波段脉冲。它可以根据实验输入的反馈校准，精确地定制由微波谐振器中的自旋“看到”的激发曲线。我们演示了生成各种脉冲形状的能力，包括矩形、三角形、高斯、正弦和绝热快速通过波形。然后，我们展示了如何精确地补偿由于传输到微波腔中而引起的失真和展宽，以便优化与初始的、未校正的波形明显不同的校正波形。具体地说，我们利用宽度比任何失真的特征都更细的窄EPR信号来绘制对短脉冲的响应，这反过来又产生了光谱仪系统的精确传递函数。该传递函数对于线性响应区域内的所有脉冲形状都是一致的。除了具有精确的波形整形功能外，本文介绍的光谱仪还提供了对光谱仪的全数字控制和校准，允许以0.007°分辨率对脉冲相位进行相位循环，并将脉冲间延迟和脉冲持续时间指定为≤250ps分辨率。将讨论这些能力的影响和潜在应用。
We present arbitrary control over a homogenous spin system, demonstrated on a simple, home-built, electron paramagnetic resonance (EPR) spectrometer operating at 8–10 GHz (X-band) and controlled by a 1 GHz arbitrary waveform generator (AWG) with 42 dB (i.e. 14-bit) of dynamic range. Such a spectrometer can be relatively easily built from a single DAC (digital to analog converter) board with a modest number of stock components and offers powerful capabilities for automated digital calibration and correction routines that allow it to generate shaped X-band pulses with precise amplitude and phase control. It can precisely tailor the excitation profiles “seen” by the spins in the microwave resonator, based on feedback calibration with experimental input. We demonstrate the capability to generate a variety of pulse shapes, including rectangular, triangular, Gaussian, sinc, and adiabatic rapid passage waveforms. We then show how one can precisely compensate for the distortion and broadening caused by transmission into the microwave cavity in order to optimize corrected waveforms that are distinctly different from the initial, uncorrected waveforms. Specifically, we exploit a narrow EPR signal whose width is finer than the features of any distortions in order to map out the response to a short pulse, which, in turn, yields the precise transfer function of the spectrometer system. This transfer function is found to be consistent for all pulse shapes in the linear response regime. In addition to allowing precise waveform shaping capabilities, the spectrometer presented here offers complete digital control and calibration of the spectrometer that allows one to phase cycle the pulse phase with 0.007° resolution and to specify the inter-pulse delays and pulse durations to ≤250 ps resolution. The implications and potential applications of these capabilities will be discussed.
登录
查看更多内容
影响因子：
2.2
作者：
Garwood, M;DelaBarre, L
通讯作者：
DelaBarre, L
影响因子：
2.2
作者：
Khaneja, N;Reiss, T;Glaser, SJ
通讯作者：
Glaser, SJ
影响因子：
2.2
作者：
HORNAK, JP;FREED, JH
通讯作者：
FREED, JH
影响因子：
2.2
作者：
Kobzar, K;Luy, B;Glaser, SJ
通讯作者：
Glaser, SJ
影响因子：
10.6
作者：
PAULY, J;LEROUX, P;MACOVSKI, A
通讯作者：
MACOVSKI, A