Submillimeter-wave generation with ZnGeP 2 crystals

Andreev, Yu. M.; Appolonov, V. V.; Shakir, Yu. A.; Verozubova, G. A.; Gribenyukov, A. I.

doi:10.1117/12.311963

Cited by 10 publications

(7 citation statements)

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“…It must be noted that the maximal wavelength obtained with this type of conversion is up to 10 μm. This limitation of theoretical maximal wavelength (25 μm) is connected with high absorption of nonlinear crystal ZnGeP 2 at 10 μm and higher [17]. The model calculation of phase matching for collinear ee-o type sum frequency generation (SFG) of overtone and fundamental CO emission lines in ZnGeP 2 was also carried out.…”

Section: Experimental Techniques and Resultsmentioning

confidence: 99%

Mode-locked CO laser frequency doubling in ZnGeP2 with 25% efficiency

et al. 2011

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Frequency doubling of mode-locked frequencytunable CO laser emission in high quality 17-mm long ZnGeP2 nonlinear optical crystal was studied. The internal efficiency of frequency doubling exceeded 25%, which was obtained by stabilization of mode-locking regime and increasing peak power of pump radiation in the scheme "master oscillator -power amplifier". A feasibility of difference frequency conversion of both fundamental and first overtone CO laser lines to cover ∼ 4.0 -5.0 μm spectral range and a possibility of getting spectral range of ∼ 1.25 -10 μm by mixing of all CO laser lines were estimated. Internal efficiency of SHG in ZnGeP2 crystal versus pump energy when the nonlinear crystal after focal plate. CO Laser transition 9→8 P(10) (λ ≈ 5.274 μm)

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Section: Experimental Techniques and Resultsmentioning

confidence: 99%

Mode-locked CO laser frequency doubling in ZnGeP2 with 25% efficiency

et al. 2011

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“…The performance potential of GaSe, which belongs to the point group symmetry 6m2, can be attributed to its extreme physical properties. GaSe has a broadband transparency window over the range of 0.62-20 mm for non-polarized light continues at wavelengths o50 mm 2,3 . Other attractive physical properties of GaSe are its prodigious birefringence B 5 0.375 at l 5 10.6 mm and 0.79 at terahertz (THz) range 4 , and very high second-order nonlinear susceptibility d 22 5 54 pm V 21 at 10 mm 5 and 24.3 pm/V in the THz band 6 .…”

Section: Introductionmentioning

confidence: 99%

Doped GaSe crystals for laser frequency conversion

Guo

Xie

et al. 2015

Light Sci Appl

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In this review, we introduce the current state of the art of the growth technology of pure, lightly doped, and heavily doped (solid solution) nonlinear gallium selenide (GaSe) crystals that are able to generate broadband emission from the near infrared (IR) (0.8 mm) through the mid-and far-IR (terahertz (THz)) ranges and further into the millimeter wave (5.64 mm) range. For the first time, we show that appropriate doping is an efficient method controlling a range of the physical properties of GaSe crystals that are responsible for frequency conversion efficiency and exploitation parameters. After appropriate doping, uniform crystals grown by a modified technology with heat field rotation possess up to 3 times lower absorption coefficient in the main transparency window and THz range. Moreover, doping provides the following benefits: raises by up to 5 times the optical damage threshold; almost eliminates two-photon absorption; allows for dispersion control in the THz range independent of the mid-IR dispersion; and enables crystal processing in arbitrary directions due to the strengthened lattice. Finally, doped GaSe demonstrated better usefulness for processing compared with GaSe grown by the conventional technology and up to 15 times higher frequency conversion efficiency. INTRODUCTIONThe e-polytype of gallium selenide (hereinafter GaSe) has been known since 1934 1 and promises efficient optical frequency conversion and detection over a large range of wavelengths. The performance potential of GaSe, which belongs to the point group symmetry 6m2, can be attributed to its extreme physical properties. GaSe has a broadband transparency window over the range of 0.62-20 mm for non-polarized light continues at wavelengths o50 mm 2,3 . Other attractive physical properties of GaSe are its prodigious birefringence B 5 0.375 at l 5 10.6 mm and 0.79 at terahertz (THz) range 4 , and very high second-order nonlinear susceptibility d 22 5 54 pm V 21 at 10 mm 5 and 24.3 pm/V in the THz band 6 . Among the mid-infrared (IR) anisotropic nonlinear crystals, GaSe has the second highest optical damage threshold 7,8 and thermal conductivity in the plane of the (0001) A GaSe crystal was first used for laser frequency conversion in the mid-IR in 1972 9,10 . In subsequent years, GaSe was widely used for inlab mid-IR applications 5 . Over the past two decades, GaSe has been among the most promising nonlinear optical crystals for efficient generation of ultrabroadband radiation 0.8-5640 mm (with the

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“…(2) we obtain a scalar form of phase-matching: o,e are the main values of refractive indices for ith o-and e-waves, respectively, which are determined by Sellmeier dispersion equations, epm is phase-matching angle. From our experience, estimated phase-matching angles are in best agreement with experimental ones for ZnGeP2 if refractive indices are estimated with the following Sellmeier equations (oe)2 o,e B02 I (2 4C) + D'2 ,, ( X2 ge )(4) and using ofthe constants presented in…”

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confidence: 85%

<title>ZnGeP<formula><inf><roman>2</roman></inf></formula> crystal: applications for visualization or IR signals</title>

2004

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Up-conversion of long, 3-5O-ts, pulses imitating input signals of CO2 laser differential absorption lidars was investigated experimentally. Efficiency of 1 to 2% has been achieved when using 1.06-pm Nd:YAG pump emission and 3.9 mm ZnGeP2 crystal that is characterized by absorption coefficient equal to 2.0 cm' at this wavelength and 2.5cm' at up-converted 0.9548 m one. When using a silicon avalanche photodiode operating in photon counting mode operation, 450 times increase in signal-to-noise ratio can be realized in comparison with direct detection of the CO2 laser lidar signals by MCT photodiode.

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Submillimeter-wave generation with ZnGeP 2 crystals

Cited by 10 publications

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Mode-locked CO laser frequency doubling in ZnGeP2 with 25% efficiency

Mode-locked CO laser frequency doubling in ZnGeP2 with 25% efficiency

Doped GaSe crystals for laser frequency conversion

<title>ZnGeP<formula><inf><roman>2</roman></inf></formula> crystal: applications for visualization or IR signals</title>

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