Investigation of terahertz generation from passively Q-switched dual-frequency laser pulses

Zhao, Pu; Ragam, Srinivasa; Ding, Yujie J.; Zotova, Ioulia B.

doi:10.1364/ol.36.004818

Cited by 57 publications

(20 citation statements)

References 12 publications

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“…A pioneering "hybrid" approach, generating far-IR radiation by mixing onto a MIM diode a frequencylocked CO 2 laser and a QCL emitting around 8-μm wavelength, allowed tunable spectroscopy of rotational lines of hydrogen bromide [109]. More recently, plenty of work has been done in order to develop high performance DFG setups [110][111][112][113][114][115][116]. However, the aforementioned setups were generally bulky and unreliable and emitted low output powers (in the nW to μW range).…”

Section: Far-ir Domainmentioning

confidence: 99%

QCL-based frequency metrology from the mid-infrared to the THz range: a review

et al. 2018

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Quantum cascade lasers (QCLs) are becoming a key tool for plenty of applications, from the mid-infrared (mid-IR) to the THz range. Progress in related areas, such as the development of ultra-low-loss crystalline microresonators, optical frequency standards, and optical fiber networks for time and frequency dissemination, is paving the way for unprecedented applications in many fields. For most demanding applications, a thorough control of QCLs emission must be achieved. In the last few years, QCLs' unique spectral features have been unveiled, while multifrequency QCLs have been demonstrated. Ultra-narrow frequency linewidths are necessary for metrological applications, ranging from cold molecules interaction and ultra-high sensitivity spectroscopy to infrared/THz metrology. A review of the present status of research in this field is presented, with a view of perspectives and future applications.

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Section: Far-ir Domainmentioning

confidence: 99%

QCL-based frequency metrology from the mid-infrared to the THz range: a review

et al. 2018

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“…Many methods have been reported to achieve multi-wavelength emission such as: inserting optical selective elements (OSE) inside a cavity like etalon [7] or birefringent filter [8], by two inequivalent emitting centers coexisting inside the laser crystal [9], by angle tuning for a laser crystal [10], pumping two distinct crystals separately [11], and pumping two different crystals simultaneously [12]. For single gain medium based multi wavelength emissions their lasing wavelengths generally share the same upper energy level which makes their mode competition serious [13], thus, the approach of end pumping series crystals [12] is considered to be a solution.…”

Section: Introductionmentioning

confidence: 99%

Efficient Dual-Wavelengths Continuous Mode Lasers by End-Pumping of Series Nd:YVO4 and Nd:GdVO4 Crystals and Speckle Reduction Study

Mohamed

Zhang

et al. 2019

Photonics

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In this paper, diode pumped solid state (DPSS) lasers based on end-pumping series N d : Y V O 4 and N d : G d V O 4 crystals were studied. Dual-, tri-, and quad-wavelength emissions were achieved. In the dual-wavelength emission operation, an optical-to-optical efficiency (O-O) of 48.9% and the power instability was 0.4% were obtained. These are the most efficient and compact lasers operating in continuous wave mode reported to date with series crystals. Besides this, the effect of changing power ratio between the output laser powers on speckle reduction was investigated for the first time. In addition, tri and quad wavelength emissions were achieved with a reasonable efficiency simply by optimizing the cavity parameters.

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“…In addition, lasers operated at 1123 nm can be found to have important applications in the field of remote sensing [15]. In the dual-wavelength lasers which were used to generate the THz wave, the 1123 nm wave can also be used as one perhaps wavelength to generate new THz wave [16][17][18]. Till date, Nd:YAG lasers operating in Stark component of the 4 F 3/2 -4 I 11/2 transition have been proved to be a practical approach to generate 1123 nm lasers [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%