Noise Analysis of Second‐Harmonic Generation in Undoped and MgO‐Doped Periodically Poled Lithium Niobate

Wang, Yong; Fonseca-Campos, Jorge; Liang, Wanguo; Xu, Chang‐Qing; Vargas‐Baca, Ignacio

doi:10.1155/2008/428971

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…7. A similar behaviour of increased SHG noise relative to the IR noise has been reported in [19]. In the frequency range [100 -1M] Hz, the cascaded SHG light has a RIN value of 0.062 % rms.…”

Section: Shg Laser Noisesupporting

confidence: 80%

“…The increase in IR noise is to be expected as the powers of the two electromagnetic fields (IR and SHG) are correlated. Since the frequency conversion process is quadratic in the input optical power, one would expect the relative SHG amplitude noise to be a factor of 2 (6 dB electrical) larger than that of the input IR, similar to the increase in amplitude noise observed in [19]. That said, the additional white noise in the case of two phase matched crystals is somewhat surprising and its origin is not clear.…”

Section: Discussionmentioning

confidence: 97%

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Intensity Noise Transfer Through a Diode-Pumped Titanium Sapphire Laser System

Tawfieq

Hansen

Jensen

et al. 2018

IEEE J. Quantum Electron.

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Abstract-In this paper, we investigate the noise performance and transfer in a titanium sapphire (Ti:S) laser system. This system consists of a DBR tapered diode laser, which is frequency doubled in two cascaded nonlinear crystals and used to pump the Ti:S laser oscillator. This investigation includes electrical noise characterizations of the utilized power supplies, the optical noise of the fundamental light, the second harmonic light, and finally the optical noise of the femtosecond pulses emitted by the Ti:S laser. Noise features originating from the electric power supply are evident throughout the whole transfer chain. It is demonstrated that improving the electrical noise provides an easy method for reducing the relative intensity noise (RIN) in all stages. The frequency doubled light is shown to have a higher RIN than the fundamental light. In particular, the cascaded system is seen to exhibit higher RIN than a setup with only a single nonlinear crystal. The Ti:S is shown to have a cut-off frequency around 500 kHz, which means that noise structures of the pump laser above this frequency are strongly suppressed. Finally, the majority of the Ti:S noise seems to originate from the laser itself, which partly can be explained by the effect of relaxation oscillation frequency.

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Section: Shg Laser Noisesupporting

confidence: 80%

Section: Discussionmentioning

confidence: 97%

Intensity Noise Transfer Through a Diode-Pumped Titanium Sapphire Laser System

Tawfieq

Hansen

Jensen

et al. 2018

IEEE J. Quantum Electron.

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“…This means that the RMS of the relative intensity fluctuations of the kth harmonic is expected to be a factor k higher leading to an RIN (PSD), a factor k 2 higher than the fundamental RIN. This law has been experimentally demonstrated for SHG in bulk crystals [45,46].…”

Section: Uv-dcs Laser Sourcesmentioning

confidence: 70%

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

2020

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The development of increasingly sensitive and robust instruments and new methodologies are essential to improve our understanding of the Earth’s climate and air pollution. In this context, Dual-Comb spectroscopy (DCS) has been successfully demonstrated as a remote laser-based instrument to probe infrared absorbing species such as greenhouse gases. We present here a study of the sensitivity of Dual-Comb spectroscopy to remotely monitor atmospheric gases focusing on molecules that absorb in the ultraviolet domain, where the most reactive molecules of the atmosphere (OH, HONO, BrO...) have their highest absorption cross-sections. We assess the achievable signal-to-noise ratio (SNR) and the corresponding minimum absorption sensitivity of DCS in the ultraviolet range. We propose a potential light source for remote sensing UV-DCS and discuss the degree of immunity of UV-DCS to atmospheric turbulences. We show that the characteristics of the currently available UV sources are compatible with the unambiguous identification of UV absorbing gases by UV-DCS.

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“…Therefore, a periodically poled lithium niobate (PPLN) crystal was used to take additional data on the frequency-doubled output after second-harmonic generation (see figure 3.17). The quadratic dependence of the SHG frequency conversion process on the optical input power should enhance the RIN by a factor of two [234,237], corresponding to an increase of 6 dB in electrical power. Moreover, to only measure the noise centered at 1.2 µm and block contributions from the fundamental and other wavelengths, a suitable bandpass filter was placed right behind the crystal.…”

Section: Amplitude Noise Measurementsmentioning

confidence: 99%

A New Generation of Ultrafast Oscillators for Mid-Infrared Applications

Nagl¹

2021

Springer Theses

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The mid-infrared (MIR) spectral range with wavelengths between 2 µm and 20 µm holds tremendous potential for the study of complex biological systems, given the abundance of intense and unique molecular absorption lines that can be detected. Consequently, spectroscopic applications of mid-infrared radiation have garnered enormous attention in recent years. A particularly striking example is the combination of multi-MHz-repetition-rate, few-cycle MIR light sources with electric-field-resolved techniques, enabling the recording of amplitude-and phase-resolved molecular signals with unparalleled specificity and shot noise limited sensitivity. Despite the ever-growing research demand, their widespread use is severely hampered by the lack of low-noise, compact, and ultrafast laser systems.In this dissertation, a new generation of table-top mid-infrared laser sources is presented, bringing cutting-edge laser diode technology and few-cycle Cr 2+ :ZnS/ZnSe solid-state oscillators together for the first time. Not only have these laser systems proven to reliably provide coherent radiation in the 2 µm to 3 µm region, the simultaneous reduction in size and complexity, accompanied by an improved overall efficiency and -most importantly -noise performance, renders this approach as pioneering for future MIR applications.In total, three laser systems are developed, each of them pushing the frontiers of directly diode-pumped laser technology. The first one is driven by a single-emitter indium phosphide laser diode and delivers more than 500 mW of output power combined with pulse durations as short as 45 fs. With this first ever directly diodepumped Kerr-lens mode-locked (KLM) Cr 2+ :ZnS/ZnSe oscillator, experimental results confirm a highly stable operation. In addition, amplitude noise measurements reveal an excellent low-noise performance of the mode-locked laser output.Driven by the desire to match and exceed the performance of more mature fiber-laser-pumped counterparts and also to boost the efficiency of the envisaged downstream applications, the output of two single-emitter pump laser diodes is carefully combined and implemented into a second-generation design. The achieved peak powers are almost three-times higher compared to before, while the low-noise performance of the KLM output is maintained.xii Typically, the design architecture of laser systems used for generating mid-infrared radiation up to several tens of microns includes a sophisticated chain of amplification, pulse compression and parametric conversion stages. Using a powerful few-cycle mid-infrared oscillator as driving laser source instead not only significantly improves the effectiveness of these nonlinear schemes, but could even supersede the need for initial amplification. The presented third-generation system brings the directly diode-pumped Cr 2+ :ZnS/ZnSe solid-state laser technology to a new level; with output peak powers reaching 1 MW and pulse durations as short as 28 fs, direct generation of CEP-stable mid-infrared pulses in a nonlinear optical cryst...

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Noise Analysis of Second‐Harmonic Generation in Undoped and MgO‐Doped Periodically Poled Lithium Niobate

Cited by 6 publications

References 17 publications

Intensity Noise Transfer Through a Diode-Pumped Titanium Sapphire Laser System

Intensity Noise Transfer Through a Diode-Pumped Titanium Sapphire Laser System

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

A New Generation of Ultrafast Oscillators for Mid-Infrared Applications

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