High-brightness 138-W green laser based on an intracavity-frequency-doubled diode-side-pumped Q-switched Nd:YAG laser

Konno, Susumu; Kojima, Toshiharu; Fujikawa, Shuichi; Yasui, Koji

doi:10.1364/ol.25.000105

Cited by 103 publications

(34 citation statements)

References 7 publications

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“…The high stability was mainly owed to the precise control of the temperature of LBO. We estimated the beam quality factor with the method mentioned in [2]. The green beam diameter was measured with a laser beam analyzer from Spiricon Inc.…”

Section: Resultsmentioning

confidence: 99%

High electrical-to-green efficiency high stability intracavity-frequency-doubled Nd:YAG-LBO QCW 532 nm laser with a straight cavity

et al. 2010

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An electrical-to-green efficiency of more than 10% was demonstrated by intracavity-frequency-doubling a Q-switched diode-side-pumped Nd:YAG laser with a type II lithium triborate (LBO) crystal in a straight plano-concave cavity. An average power of 69.2 W at 532 nm was generated when electrical input power was 666 W. The corresponding electrical-to-green conversion efficiency is 10.4%. To the best of our knowledge, this is the highest electrical-to-green efficiency of second harmonic generation laser systems with sidepumped laser modules, ever reported. At about 66 W of green output power, the power fluctuation over 4 hours was better than ±0.86%. Width(1): 63 nsGreen laser pulse at diode current 30 A

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Section: Resultsmentioning

confidence: 99%

High electrical-to-green efficiency high stability intracavity-frequency-doubled Nd:YAG-LBO QCW 532 nm laser with a straight cavity

et al. 2010

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“…In some applications, particularly for pumping tunable lasers and optical parametric oscillators or amplifiers, a stable high-power short pulse green beam is desirable [1,2]. Intracavity frequency doubling using a KTP crystal of acousto-optic (AO) Q-switched Nd:YAG laser under diode laser pumping has proved to be an effective method in generating green laser beam at 532 nm with high average power and high efficiency [3]. But, intracavity frequency doubling suffers from power instabilities due to the thermal effects at the KTP crystal [4], Q-switching instabilities and long pulses due to the high finesse of the cavity.…”

Section: Introductionmentioning

confidence: 99%

Efficient and high-power green beam generation by frequency doubling of acousto-optic Q-switched diode-side pumped Nd:YAG rod laser in a coupled cavity

et al. 2010

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A 52-W green laser at 532 nm by extra-cavity second-harmonic generation in a coupled-cavity configuration is demonstrated. The fundamental laser is a diode-sidepumped acousto-optic (AO) Q-switched Nd:YAG rod laser producing 84 W of average power at 1064 nm at 8 kHz repetition rate. Type-II phase-matched polished KTP crystal is used as the nonlinear crystal for second-harmonic generation. The individual green pulse width is 50 ns and the fundamental to second harmonic conversion efficiency is 61.8%.

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“…A maximum output power of 82.3 W at CW 1 064 nm is achieved when the optical pump power increased to about 432 W. The corresponding optical-to-optical and electrical-to-optical efficiencies are 19.5% and 7.9%, respectively. The beam quality factor M 2 at the output power of 82.3 W is measured to be 1.38 by parabolic fitting [2] (Fig. 4).…”

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confidence: 99%

High-power near diffraction-limited 1 064-nm Nd:YAG rod laser and second harmonic generation by intracavity-frequency-doubling

Zhang¹,

Ge²,

Li³

et al. 2012

中国光学快报

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We present a near diffraction-limited 1 064-nm Nd:YAG rod laser with output power of 82.3 W (M 2 ≈1.38). The power fluctuation over two hours is better than ±1.1%. Pulsed 1 064-nm laser with an average power of 66.6 W and pulse width of 46 ns are achieved when the laser is Q-switched at a repetition rate of 10 kHz. The short pulse duration stems from the short cavity as well as the high-gain laser modules. Using intracavity-frequency-doubling, a 35.0-W near diffraction-limited 532-nm green laser (M 2 ≈1.32) is achieved with a pulse width of 43 ns.OCIS codes: 140.0140, 140.3580, 140.3410, 140.3515. doi: 10.3788/COL201210.071401. Due to their varied applications, high-power green lasers with side-pumped Nd:YAG rod lasers have developed rapidly in the last decade [1−9] . The output power of the green laser exceeds 400 W [7] . However, the reported green lasers [1−9] suffer from low beam quality (M 2 >10), because the side-pumped Nd:YAG rod is influenced by severe thermal effects, such as thermal lensing and thermal birefringence. Moreover, it is very difficult to achieve a good match between the TEM 00 mode and the pumping volume. Few studies have reported high-power green lasers with high beam quality and side-pumped Nd:YAG modules, which are usually obtained by extracavity-frequency-doubling with a complex end-pumped master-oscillator power amplifier (MOPA) system [10−12] or a complex injection seeded system [13] . However, Hirano et al. have reported an output power of 208-W TEM 00 1 064-nm laser with two specially designed side-pumped Nd:YAG modules [14] , which has the potential to obtain high-power high-beamquality second harmonic generation (SHG) with a compact intracavity-frequency-doubling system.In this letter, we report a high-power high-beamquality 1 064-nm Nd:YAG rod laser and SHG by intracavity-frequency-doubling. We used a short symmetrical cavity with two concave mirrors compensating for the thermal focal effect of the Nd:YAG rod. Compared with the complex end-pumped MOPA or injection seeded system, the symmetric cavity is compact and can easily achieve a hundred-watt level near the diffractionlimited laser beam. Moreover, in comparison with the conventional unstable resonators, the plane-parallel cavity has a wider thermal stability region according to the theoretical calculation with the standard ABCD ray propagation matrix. The configuration of the cavity is demonstrated to have a good scheme for high-power TEM 00 1 064-nm laser generation [14] . With two common side-pumped Nd:YAG rod modules in the short cavity, we achieved an 82.3 W near diffraction-limited continuous wave (CW) 1 064-nm laser (M 2 ≈1.38) with a good power stability of ±1.1% for over two hours. The output power and pulse duration with different Q-switched frequencies of 10, 15, and 20 kHz are also studied. A pulsed 1 064-nm laser beam with pulse width of 46 ns is achieved at a Q-switched frequency of 10 kHz and an average output power of 66.6 W. Finally, a 35.2-W pulsed green laser with a pulse width of 43 ns in a near di...

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High-brightness 138-W green laser based on an intracavity-frequency-doubled diode-side-pumped Q-switched Nd:YAG laser

Abstract: Green power of 138 W was generated at an estimated beam quality of M(2) = 11 by intracavity frequency doubling of a diode-pumped Nd:YAG laser. The laser employs a diffusive close-coupled diode-pumping design and a bifocusing-compensation resonator design to ensure stable operation.

Cited by 103 publications

References 7 publications

High electrical-to-green efficiency high stability intracavity-frequency-doubled Nd:YAG-LBO QCW 532 nm laser with a straight cavity

High electrical-to-green efficiency high stability intracavity-frequency-doubled Nd:YAG-LBO QCW 532 nm laser with a straight cavity

Efficient and high-power green beam generation by frequency doubling of acousto-optic Q-switched diode-side pumped Nd:YAG rod laser in a coupled cavity

High-power near diffraction-limited 1 064-nm Nd:YAG rod laser and second harmonic generation by intracavity-frequency-doubling

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