Compact 21-W 2-µm intracavity optical parametric oscillator

Wu, Rongbo; Phua, P. B.; Lai, Kin Seng; Lim, Yuan Liang; Lau, Ernest; Chng, Audrey; Bonnin, C.; Lupinski, Dominique

doi:10.1364/ol.25.001460

Cited by 36 publications

(13 citation statements)

References 9 publications

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“…At the maximum output power, the efficiency of the power conversion of diode power to 2 μm power is about 5% for our intracavity PPMgLN OPO. It is larger by a factor of 1.3 than the intracavity KTP reported in [2]. However, obvious crystal temperature rising is found when the pump current is larger than 19 A.…”

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confidence: 69%

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High average power 2 μm generation using an intracavity PPMgLN optical parametric oscillator

Jiao¹,

He²,

Guo³

et al. 2011

Opt. Lett.

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An intracavity quasi-phase-matched optical parametric oscillator (OPO) has been developed for the purpose of generating radiation with high average power and high repetition rate in the 2 μm regime. The device is a degenerate OPO based on a 3 mm thick MgO-doped periodically poled LiNbO(3) (PPMgLN) crystal, which is pumped in turn within the cavity by a diode side-pumped, Q-switched 1 μm Nd:YAG laser operating at 10 kHz. Up to 20 W broadband 2 μm radiation can be generated with a compact configuration under the crystal temperature of 115 °C. The beam profile is close to circularly symmetric with M(2) ~ 10.

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confidence: 69%

“…Intracavity degenerate OPOs, based on birefringent materials such as KTiOPO 4 (KTP) employing type II phase matching, have been investigated by Wu and coworkers. [2][3][4]. They achieved over 20 W output at 2 μm from a walk-off compensated intracavity KTP OPO.…”

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confidence: 99%

High average power 2 μm generation using an intracavity PPMgLN optical parametric oscillator

Jiao¹,

He²,

Guo³

et al. 2011

Opt. Lett.

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“…Dual-wavelength ns optical parametric oscillators (OPOs) operating around 1.06 μm, 1.55 μm, 2 μm, and 10 μm have been applied into the DFG process to achieve THz sources, and in consideration of the compactness, high quantum efficiency, high average power, wide tuning range and low cost, 2 μm OPO is the best choice. In 2000, Wu et al [6] demonstrated a compact 21-W 2 μm doubly resonant intracavity KTP optical parametric oscillator pumped by a linearly polarized Nd:YALO laser with a beam quality factor of M 2~1 8 and the efficiency from 1 μm to 2 μm of 0.037%. In 2014, Qianjin Cui et al [7] reported a high-power intracavity pumped doubly resonant OPO at A dichromatic mirror DM (HR at 1.06 μm and AR at 2.0-2.3μm) was used to filter the residual fundamental laser, and the dual-wavelength laser was incident into QPM-GaAs/GaSe crystals for DFG without focusing.…”

Section: Introductionmentioning

confidence: 99%

Compact high-repetition-rate terahertz source based on difference frequency generation from an efficient 2-μm dual-wavelength KTP OPO

et al. 2016

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A compact optical terahertz (THz) source was demonstrated based on an efficient high-repetition-rate doubly resonant optical parametric oscillator (OPO) around 2 μm with two type-II phase-matched KTP crystals in the walk-off compensated configuration. The KTP OPO was intracavity pumped by an acousto-optical (AO) Q-switched Nd:YVO4 laser and emitted two tunable wavelengths near degeneracy. The tuning range extended continuously from 2.068 μm to 2.191 μm with a maximum output power of 3.29 W at 24 kHz, corresponding to an optical-optical conversion efficiency (from 808 nm to 2 μm) of 20.69%. The stable pulsed dual-wavelength operation provided an ideal pump source for generating terahertz wave of micro-watt level by the difference frequency generation (DFG) method. A 7.84-mm-long periodically inverted quasi-phase-matched (QPM) GaAs crystal with 6 periods was used to generate a terahertz wave, the maximum voltage of 180 mV at 1.244 THz was acquired by a 4.2-K Si bolometer, corresponding to average output power of 0.6 μW and DFG conversion efficiency of 4.32×10 -7 . The acceptance bandwidth was found to be larger than 0.35 THz (FWHM). As to the 15-mm-long GaSe crystal used in the type-II collinear DFG, a tunable THz source ranging from 0.503 THz to 3.63 THz with the maximum output voltage of 268 mV at 1.65 THz had been achieved, and the corresponding average output power and DFG conversion efficiency were 0.9 μW and 5.86×10 -7 respectively. This provides a potential practical palm-top tunable THz sources for portable applications.

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“…At present, there are few reports on OPOs at 2 lm, and the output power is usually below 50 W from the intra-cavity-pumped doubly resonant OPOs. In 2000, Wu et al [15] reported a doubly resonant KTP OPO with an output power of 21 W at 2 lm which was pumped by a linearly polarized Nd:YALO laser with a beam quality factor of M 2 * 18. In 2007, Xie Gang et al [16] reported an intra-cavity-pumped doubly resonant OPO with an output power of 23.6 W pumped by the Nd:YAG laser at 1.06 lm, and in 2009, the average output power at 2 lm was increased to 46.5 W by the same group with a similar OPO [17].…”

Section: Introductionmentioning

confidence: 99%

70-W average-power doubly resonant optical parametric oscillator at 2 μm with single KTP

Cui

Shu

et al. 2014

Appl. Phys. B

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We have demonstrated a high-power intracavity-pumped doubly resonant optical parametric oscillator (OPO) at 2 lm with single-type II phase-matched KTP. A linearly polarized Q-switched solid-state Nd:YAG laser was used as the intra-cavity pump source, of which the output power and beam quality were improved by cascading two laser rods for compensating the thermal birefringence as well as by placing double acoustic-optical Q-switches orthogonally, and the output power of the doubly resonant OPO was studied versus the temperature of KTP and the repetition rate of the Q-switch. The output power was insensitive to the temperature of KTP in a wide range, and 70-W average power was obtained at 2 lm with the repetition rate of 5 kHz. The stability of the OPO laser was measured to be \3.5 % root mean square at the output power of 70 W for 400 s.

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Compact 21-W 2-µm intracavity optical parametric oscillator

Cited by 36 publications

References 9 publications

High average power 2 μm generation using an intracavity PPMgLN optical parametric oscillator

High average power 2 μm generation using an intracavity PPMgLN optical parametric oscillator

Compact high-repetition-rate terahertz source based on difference frequency generation from an efficient 2-μm dual-wavelength KTP OPO

70-W average-power doubly resonant optical parametric oscillator at 2 μm with single KTP

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