Laser frequency combs have properties that make them promising spectrograph calibration light sources. One drawback for this application is the high dynamic range in the supercontinuum spectra of some frequency combs. We aim to flatten the spectrum of a Ti:sapphire laser frequency comb to improve the calibration performance for a Fourier transform spectrograph. For this, we develop a compact Fourier transform optical pulse shaping setup, which enables control of the spectral envelope via dispersion of the light onto a spatial light modulator (SLM). We demonstrate that this setup allows us to flatten the comb spectrum in the wavelength range 780 to 980 nm. For 90% of the wavelength range, the dynamic range is below 3 dB. In the flattened spectra 3% more comb lines can be detected. The line center fit precision, however, is reduced due to noise caused by the SLM.

中文翻译：

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平坦频率梳频谱的频谱包络控制

激光频率梳的特性使其成为有前途的光谱仪校准光源。这种应用的一个缺点是一些频率梳的超连续谱中的高动态范围。我们的目标是使 Ti:sapphire 激光频率梳的光谱变平，以提高傅里叶变换光谱仪的校准性能。为此，我们开发了一种紧凑的傅立叶变换光脉冲整形装置，它可以通过将光分散到空间光调制器 (SLM) 上来控制光谱包络。我们证明了这种设置使我们能够在 780 到 980 nm 的波长范围内使梳状光谱变平。对于 90% 的波长范围，动态范围低于 3 dB。在平坦化的光谱中，可以检测到多出 3% 的梳状线。然而，线中心拟合精度，