Noncritically phase matched mid-infrared generation in AgGaSe/sub 2/

Komine, H.; Fukumoto, Joseph M.; Long, W. H.; Stappaerts, E. A.

doi:10.1109/2944.468373

Cited by 35 publications

(6 citation statements)

References 9 publications

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“…This tuning range is currently limited by our choice of available KTA crystals and optics. The CdSe crystal used in the second-stage OPO has a relatively low surface-damage threshold, 60 MW/cm 2 for 50-ns pulses, but also a high nonlinear figure of merit, d 2 /n 3 = 2.4x10 -23 (m/V) 2 . The ability to operate with NCPM and use all the available crystal length for gain allows OPO operation at pump intensities well below the damage level.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…These crystals are semiconductors and have high absorption in the near-infrared region, which precludes direct pumping by well-developed, Nd-doped, 1-µm lasers. One alternative to direct Nd-laser pumping is a two-stage, or tandem OPO design, where the output of one OPO serves as the pump for another [1][2][3][4]. In references [1] and [2], AgGaSe 2 was used as a second-stage OPO material, with LiNbO 3 [1] and KNbO 3 [2] used in the first-stage, Nd-laser-pumped OPOs.…”

Section: Introductionmentioning

confidence: 99%

“…One alternative to direct Nd-laser pumping is a two-stage, or tandem OPO design, where the output of one OPO serves as the pump for another [1][2][3][4]. In references [1] and [2], AgGaSe 2 was used as a second-stage OPO material, with LiNbO 3 [1] and KNbO 3 [2] used in the first-stage, Nd-laser-pumped OPOs. The spectral range covered in [1] was between 2.6 and 6 µm with a maximum conversion efficiency of 1.75%.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Wavelength, 1.5-10-µm Tunable, Tandem OPO

Isyanova

Dergachev

Welford

et al. 2001

Advanced Solid State Lasers

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A systematic investigation of the tunability and efficiency of non-critically phase-matched (NCPM) and critically phase-matched (CPM) KTA OPOs using x-and ycut crystals orientations has been conducted for the first time. Using our previously developed tandem, KTA-CdSe, OPO technology, we demonstrate a multi-wavelength, mid-infrared source capable of simultaneously delivering tunable radiation in four broad bands covering the range from 1.5 to 10 µm with high conversion efficiency.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-Wavelength, 1.5-10-µm Tunable, Tandem OPO

Isyanova

Dergachev

Welford

et al. 2001

Advanced Solid State Lasers

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show abstract

“…However, for achieving optimal OPO efficiency, the limitations imposed by low angular acceptance and large walkoff parameters have to be carefully considered. The NPCM offers high angular acceptance and very low walkoff with limited wavelength tunability [23]. Phase matching can be either Type I or Type II depending on the polarization of three beams.…”

Section: Nonlinear Frequency Convertersmentioning

confidence: 99%

Optical communications in the mid-wave IR spectral band

Prasad

2005

J Optic Comm Rep

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The mid-wave IR (MWIR) spectral band extending from 3 to 5 microns is considered to be a low loss atmospheric window. The MWIR wavelengths are eye safe and are attractive for several free-space applications including remote sensing of chemical and biological species, hard target imaging, range finding, target illumination, and free-space communications. Due to the nature of light-matter interaction characteristics, MWIR wavelength based systems can provide unique advantages over other spectral bands for these applications. The MWIR wavelengths are found to effectively penetrate natural and anthropogenic obscurants. Consequently, MWIR systems offer increased range performance at reduced power levels. Free-space, line-of-sight optical communication links for terrestrial as well as space based platforms using MWIR wavelengths can be designed to operate under low visibility conditions. Combined with high-bandwidth, eye-safe, covert and jam proof features, a MWIR wavelength based optical communication link could play a vital role in hostile environments.A free-space optical communication link basically consists of a transmitter, a receiver and a scheme for directing the beam towards a target. Coherent radiation in the MWIR spectral band can be generated using various types of lasers and nonlinear optical devices. Traditional modulation techniques are applicable to these optical sources. Novel detector and other subcomponent technologies with enhanced characteristics for a MWIR based system are advancing. Depending on the transmitter beam characteristics, atmospheric conditions may adversely influence the beam propagation and thereby increasing the bit error rate. For satisfactory transmission over a given range, the influence of atmosphere on beam propagation has to be analyzed. In this chapter, salient features of atmospheric modeling required for wavelength selection and performance prediction is presented. Potential optical sources and detectors for building a practical MWIR communication link are surveyed. As an illustration, the design configuration and experimental results of a recently demonstrated free-space, Optical communications in the mid-wave IR spectral band 559 obscurant penetrating optical data communication link suitable for battlefield applications is discussed. In this case, the MWIR wavelength was derived using an all solid-state, compact, optical parametric oscillator device. With this device, weapon codes pertaining to small and large weapon platforms were transmitted over a range of 5 km. Furthermore, image transmission through light fog, accomplished using this hardware, is also presented.Advances in source and detector technologies are contributing to the development of cost effective systems compatible with various platforms requirements. In coming years, MWIR wavelengths are anticipated to play a vital role in various human endeavors.

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“…Approach of a cascaded two-stage optical parametric generation scheme is employed in this case [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In the first stage, the OPO incorporating the KTP, KTA, or LN crystals pumped by the Nd:YAG laser generates radiation in the near-infrared (NIR) spectral region.…”

Section: Opo Laser Sources For Ir Lidarsmentioning

confidence: 99%

Application of atmosphere sensing by infrared lidars for environmental protection and industry needs

Švedas¹,

Vaicikauskas²,

Kaucikas³

2010

Lithuanian J. Phys.

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The paper analyses some equipment and methodological aspects of atmospheric pollution monitoring by infrared lidars. Features of optical parametric oscillators (including our created two-stage system) operating in the spectral ranges of molecular fundamental vibrations are discussed. The environment protection and industry demands for this remote monitoring technology are considered. Despite the progress in the technology and low detection limits achieved, the reliable and fast identification of pollutants is far from perfection. Inner and outer factors worsening the lidar performance, i. e. stability of the transmitted pulse energy, atmospheric turbulence, and irregularity of the pollutant plume near the source, are examined. A lidaric measurement model implying pulse stability was developed and applied to the 8-14 µm and 0.5 mJ per pulse lidar operating in the topographic target mode with the 0.05 m 2 telescope and the mercury cadmium telluride detector. It has been found that the laser pulse energy instability (energy dispersion parameter D) essentially worsens the detection limit in shorter ranges (<2 km for D =1%). Adaptation of lidar technology to the fast varying irregular plumes was tested experimentally. Plume detection events were processed using the probabilistic model, and the probability of false alarm was evaluated.

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Noncritically phase matched mid-infrared generation in AgGaSe/sub 2/

Cited by 35 publications

References 9 publications

Multi-Wavelength, 1.5-10-µm Tunable, Tandem OPO

Multi-Wavelength, 1.5-10-µm Tunable, Tandem OPO

Optical communications in the mid-wave IR spectral band

Application of atmosphere sensing by infrared lidars for environmental protection and industry needs

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