A KTA Optical Parametric Oscillator Pumped by a Q-Switched, Injection-seeded Nd:YAG Laser

Chuang, Ti; Kasinski, Jeff; Verdún, Horacio R.

doi:10.1364/assl.1996.op4

Cited by 6 publications

(8 citation statements)

References 3 publications

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“…For optimization of pulse energy of Q-switched laser by Cr:YAG absorber we have used theoretical model described in 34 . Analytical solutions for the optimized operation of passive Q-switched lasers described by equations (9,10,11). The model can easily determine the unsaturated absorber transmission T 0(opt) and the reflectivity of the output mirror R opt which maximizes the output energy of laser as a function of a initial gain coefficient k i .…”

Section: Free Running and Q-switching Experiments For Nd:ylf Lasermentioning

confidence: 99%

“…This bulk absorption greatly increases the optical damage threshold of the eye. Three types of eye safe lasers are of the practical importance: lasers with erbium (Er) doped media directly operated at 1.54 µm wavelength 1-6 , Raman lasers pumped by pulsed neodymium (Nd) lasers operating at the strongest 1064 nm or 1340 nm lines [7][8][9][10] , and optical parametric oscillators (OPO) pumped by high peak power Nd lasers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] . The best approach, in our opinion, nowadays for pulsed eye safe laser is application of OPO pumped by high peak power Nd laser.…”

Section: Introductionmentioning

confidence: 99%

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300-kW, eye-safe intracavity OPO with efficient pulse shortening

2008

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We report on a passively Q-switched end pumped Nd:YLF laser including a noncritically phase-matched KTP singly resonant intracavity optical parametric oscillator (IOPO-KTP). For the Q-switching operation we have used Cr:YAG saturable absorber. The optimized passively Q-switched Nd:YLF laser without IOPO generated linearly polarized pulses of 11.5 ns and 1.07 mJ at 1047 nm. The conversion efficiency of the optimized Q-switched pulse energy at 1047 nm to 1547 nm of signal approached about 47%. For optimizing both Nd:YLF laser and IOPO we have numerically solved theoretical model. We have achieved 1.6-ns duration pulses at 1547 nm with energy of 0.5 mJ and peak power above of 300 kW. The beam quality was excellent (M 2 ≈1).

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Section: Free Running and Q-switching Experiments For Nd:ylf Lasermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

300-kW, eye-safe intracavity OPO with efficient pulse shortening

2008

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“…This bulk absorption greatly increases the optical damage threshold of the eye. Three types of eye−safe lasers are of the practical importance, i.e., lasers with er− bium (Er) doped media directly operating at 1.54 µm wave− length [1][2][3][4][5][6], Raman lasers pumped by pulsed neodymium (Nd) lasers operating at the strongest 1064 nm or 1340 nm lines [7][8][9][10], and optical parametric oscillators (OPO) pum− ped by high peak power Nd lasers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Intracavity optical parametric oscillator pumped by passively Q-switched Nd:YLF laser

Żendzian

Jabczyński

Kwiatkowski

2009

Opto-Electronics Review

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We report on a passively Q-switched end pumped Nd:YLF laser including a noncritically phase-matched KTP singly resonant intracavity optical parametric oscillator (IOPO-KTP). For the Q-switching operation we have used Cr:YAG saturable absorber. The optimized passively Q-switched Nd:YLF laser without IOPO generated linearly polarized pulses of 11.5 ns and 1.07 mJ at 1047 nm. The conversion efficiency of the optimized Q-switched pulse energy at 1047 nm to 1547 nm of a signal approached about 47%. For optimizing both Nd:YLF laser and IOPO we have numerically solved a theoretical model. We have achieved 1.6-ns duration pulses at 1547 nm with energy of 0.5 mJ and peak power of above 300 kW. The beam quality was excellent (M2 ≈1).

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“…Because of the indicated properties, they make it possible to rather efficiently, using single-cavity OPOs, to convert the wavelength of emission from Nd lasers to the wavelength range 1.54-1.61 µm. Single-cavity OPOs based on crystals of the KTP family are constructed using Nd:YAG, Nd:YLiF, and Nd:YVO 4 lasers with lamp and diode pumping [1][2][3][4].With pumping by Q-switched Nd lasers, OPOs based on KTP crystals can generate nanosecond pulses with energies of tens and hundreds of millijoules [5-10]. Such good power characteristics make KTP OPOs promising for many practical applications.…”

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confidence: 99%

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confidence: 99%

Eye-safe radiation source based on an optical parametric oscillator

et al. 2006

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We have studied an optical parametric oscillator (OPO) with an unstable telescopic cavity, placed inside the cavity of an actively Q-switched multimode Nd 3+ :KGW pump laser. We used a KTP crystal as the nonlinear medium for the OPO. We have compared the emission characteristics of OPOs with unstable telescopic and planar cavities. We have established that compared with the planar cavity, the unstable cavity reduces the OPO beam divergence and improves the spatial distribution of the radiation energy in the far wave zone.Based on our investigations, we have designed a compact eye-safe (λ = 1.578 µm) laser source with natural cooling, emitting (for electrical pumping energy 7.3 J) pulses with pulse energy 22 mJ and pulse duration 6 nsec. The FWHM beam divergence for the source is no greater than 3.5 mrad.Introduction. One of the most effective methods for generating eye-safe radiation is based on an optical parametric oscillator using crystals in the KTP family, pumped by radiation from Nd 3+ -containing lasers. KTP and KTA crystals have high radiation resistance, high nonlinear optical coefficients, and ensure lasing under noncritical phase matching conditions. Because of the indicated properties, they make it possible to rather efficiently, using single-cavity OPOs, to convert the wavelength of emission from Nd lasers to the wavelength range 1.54-1.61 µm. Single-cavity OPOs based on crystals of the KTP family are constructed using Nd:YAG, Nd:YLiF, and Nd:YVO 4 lasers with lamp and diode pumping [1][2][3][4].With pumping by Q-switched Nd lasers, OPOs based on KTP crystals can generate nanosecond pulses with energies of tens and hundreds of millijoules [5-10]. Such good power characteristics make KTP OPOs promising for many practical applications. However, the OPO beam divergence and field structure are no less important characteristics of eye-safe radiation (for example, for detection and ranging). Previously, high-power OPOs were generally constructed using linear planar cavities which, when the pump beam is matched with an eigenmode of the OPO cavity, ensure a sufficiently large waist (a few millimeters) and thus make it possible to operate below the damage threshold of the crystals. However, the divergence of the radiation from an OPO with a planar cavity is relatively large, since for short cavities it is determined more by the geometric aperture of the pumped volume than by the pump beam quality, if the pump beam divergence exceeds the diffraction limit [11]. A decrease in the divergence of the OPO radiation is facilitated by use of a ring cavity [10]. However, in order to achieve high radiation energy, this approach requires using several KTP crystals in the OPO, which increases the cost of the source.As shown by recent theoretical [12] and experimental [13,14] investigations, the divergence of the OPO radiation can be reduced by using an unstable telescopic cavity. The advantage of such a cavity over a planar cavity has been demonstrated for extracavity OPOs, pumped by laser beams with divergence close to...

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A KTA Optical Parametric Oscillator Pumped by a Q-Switched, Injection-seeded Nd:YAG Laser

Cited by 6 publications

References 3 publications

300-kW, eye-safe intracavity OPO with efficient pulse shortening

300-kW, eye-safe intracavity OPO with efficient pulse shortening

Intracavity optical parametric oscillator pumped by passively Q-switched Nd:YLF laser

Eye-safe radiation source based on an optical parametric oscillator

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