Miniaturized Widely Tunable MgO∶PPLN Nanosecond Optical Parametric Oscillator

Fig. 2. Wavelength tunable capability of MgO∶PPLN OPO. (a) Signal light spectrum of 29 μm period at 40 ℃; (b) signal light spectrum of 31.6 μm period at 180 ℃; (c) wavelength tunable range

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Fig. 3. Laser output characteristics at 9.95 W pump power. (a) Average output power at different wavelength; (b) pulse profile at 4014.4 nm and residual 1064.2 nm; (c) pulse profile at 2370.8 nm and residual 1064.2 nm

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Fig. 4. 2.4, 2.7, 3.8, and 4.0 μm average output power variation curves with pump power

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Fig. 5. Beam quality at maximum power. (a) 2.4 μm; (b) 2.7 μm; (c)3.8 μm; (d)4.0 μm

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Fig. 6. Stability at maximum average power of 2.4, 2.7, 3.8, and 4.0 μm

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Table 1. OPO cavity mirror coating parameters

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Table 1. OPO cavity mirror coating parameters

OPO cavity mirror	Period Λ=29--31 μm	Period Λ=31.6 μm
M1	HT@1.06 μm;HR@1.4--1.6 μm, 3.29--3.9 μm	HT@1.06 μm;HR@1.7--2.0 μm, 2.4--2.9 μm
M2	HR@1.06 μm, 1.4--1.6 μm;HT@3.29--3.9 μm	HR@1.06 μm, 1.7--2.0 μm;HT@2.4--2.9 μm

Table 2. Parameter values in Sellmeier equation
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Table 2. Parameter values in Sellmeier equation
Parameter Value Parameter Value
a₁ 5.756 a₆ 0.0132
a₂ 0.0983 b₁ 2.86×10^-6
a₃ 0.202 b₂ 4.7×10^-8
a₄ 189.32 b₃ 6.113×10^-8
a₅ 12.52 b₄ 1.516×10^-4

Table 3. Research progresses of MIR PPLN OPO pumped by fiber laser

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Table 3. Research progresses of MIR PPLN OPO pumped by fiber laser

Pump source parameter	Crystal parameter	MIR laser output characteristic	Reference
Yb fiber laser@1064 nm,20 W, 81.1 MHz	MgO∶PPLN, 50 mm,28.5--30.5 μm period	3.06--4.16 μm, 4.6 W@3.33 μm,optical-optical efficiency 28.7%	[26]
Yb fiber optic amplifier, 10 W	MgO∶PPLN, 40 mm,29.98 μm period	0.9 W@2900 nm, M²~1.1	[27]
Yb fiber laser @1064 nm,20 W, 20 ps, 80 MHz	MgO∶PPLN, 50 mm, 30.5 μm period	3118--3393 nm, 290 mW@3393 nm,optical-optical efficiency ~3.8%	[28]
Yb fiber laser @1064 nm, 20 W	MgO∶PPLN, 50 mm, 28.5--31.5 μm, 6 period	3.0--3.9 μm, 1.73 W@3.0 μm,1.03 W@3.7 μm	[24]
Yb fiber laser @1064 nm,20 W, 20 ps, 9.4 MHz	MgO∶PPLN, 35 mm, 28 μm period, angle from 0°--30°	2418--4307 nm, 1.7 W@2950 nm	[29]
Nanosecond Yb/Er fiber opticamplifier @1065 nm, 29 W	MgO∶PPLN, 40 mm, 29.98 μm period	3.31--3.48 nm, 6 W@3.35 μm,M²~1.4	[30]
Yb fiber laser @1064 nm, 14 W	MgO∶PPLN, 40 mm;29.52--31.59 μm period	2260--3573 nm, 2.4 W@2991.5 nm(peak power~30 W);	[31]
Yb fiber laser @1064 nm, 20 W	MgO∶PPLN, 50 mm,29--31.6 μm, 6 period	2370.8--4014.4 nm,3.68 W@3.4 μm	Proposed

Table 4. 2.4, 2.7, 3.8, and 4.0 μm output power analysis

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Table 4. 2.4, 2.7, 3.8, and 4.0 μm output power analysis

Wavelength /μm	Input power /W	Maximum outputpower /W	Optical-opticalefficiency /%	Single pulseenergy /μJ	Peak power /W
2.4	16.7	2.87	17.2	57.4	445.0
2.7	12.4	2.45	19.8	49.0	371.2
3.8	16.7	1.87	11.2	37.4	235.2
4.0	14.2	1.22	8.6	24.4	144.4

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Feifei Wang, Hongkun Nie, Junting Liu, Kejian Yang, Baitao Zhang, Jingliang He. Miniaturized Widely Tunable MgO∶PPLN Nanosecond Optical Parametric Oscillator[J]. Chinese Journal of Lasers, 2021, 48(5): 0501015

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