共查询到20条相似文献,搜索用时 31 毫秒
1.
This paper presents a specially designed optical parametric oscillator (OPO) which achieved high-efficiency mid-infrared laser
of 2.83 μm. The cascaded nonlinear interactions of OPO and optical parametric amplifier (OPA) were simultaneously realized
in a single MgO:PPLN crystal. The signal oscillation of 1.70 μm was used to pump a secondary parametric process that resulted
in amplification of the idler laser of 2.83 μm. When the MgO:PPLN crystal with a grating period of 31.2 μm was pumped by a
1.064 μm laser and operated at 148°C, the quasi-phase-matching of both OPO and OPA could be simultaneously achieved. Average
output power of 7.68 W at 2.83 μm was obtained for 25 W of pump at 7 kHz. The power conversion efficiency of 2.83 μm laser
was 30.7%, which was evidently higher than common OPOs. 相似文献
2.
The experimental results of a high-power tunable mid-IR laser are presented. The optical parametric oscillator (OPO) with
a 3-mm-thick PPMgCLN crystal was pumped by a 1.064 μm pulse laser. When the pump power of the 1.064 μm laser was 151 W at
10 kHz, and the operating temperature of the PPMgCLN with 5% MgO doping was 100°C, average output power of 23.7 W at 3.91
μm was obtained with a slope efficiency of 18.2% for the idler resonant OPO. The variation of the 3.91 μm output power was
about ±4% in 10 min continuous operation. The beam quality factor M
2 was less than 2.6. The average output power of 27.4 W at 3.91 μm was also obtained with 151 W pump power and the slope efficiency
of 20.9% for the signal resonant OPO by changing the coating parameters of the OPO cavity mirrors. The mid-IR wavelength tunability
of 3.7–4.0 μm can be achieved by adjusting the temperature of a 29 μm period PPMgCLN crystal from 200 to 30°C. 相似文献
3.
We report a compact and viable source of high-efficiency, high-repetition-rate, temperature-tuning, mid-IR optical parametric
oscillator (OPO) based on periodically poled MgO-doped lithium niobate (PPMgOLN) pumped by a homemade high power AOM Q-switched
Nd:YVO4 laser centered at 1.064 μm. With an optimal plane-concave resonator configuration, average output power of 5.7 W at 2.73
μm was obtained when the pump power was 25 W at the repetition rate of 80 kHz. The conversion efficiency from the 1.064 μm
laser to the 2.73 μm laser was 22.8%. Temperature tuning of the OPO yielded a signal wavelength range from 1.67 to 1.75 μm
and an idler wavelength in the range of 2.72 to 2.92 μm. 相似文献
4.
We report a continuous-wave (CW) mid-infrared singly resonant optical parametric oscillator (SRO) based on periodically poled
MgO-doped LiNbO3 (PPMgLN) pumped by a high power, single frequency fiber laser in master oscillator-power amplifier (MOPA) configuration at
1.064 μm. Using four-mirror ring OPO cavities, at the PPMgLN’s grating period of 30.5 μm and the temperature of 23°C, we achieved
the maximum idler output power of 7.2 W at 3.4 μm when the pump power was 52.8 W. The total power-conversion efficiency from
the pump to the idler in this experiment is about 13.6%, and corresponds to ∼44% of quantum-limited performance. 相似文献
5.
We present a period-continuously-tunable optical parametric oscillator based on a fan-out MgO:PPLN with a grating period range
from 26.9 to 29.5 μm. The OPO was pumped by a Q-switched Nd:YAG laser with a repetition of 10 kHz. With a grating period of
29.3 μm and 22.0 W pump power, the idler output power at 3.78 μm arrived at 3.40 W. With a period of 27.1 μm and 13.5 W pump,
the idler output at 4.58 μm arrived at 0.36 W. This is, to our best knowledge, the highest average power for pulsed OPO operating
near 4.5 μm based on PPLN or MgO:PPLN. By translating the fan-out MgO:PPLN, the idler wavelength was tuned continuously from
3.78 to 4.62 μm. 相似文献
6.
P. Koch F. Ruebel M. Nittman T. Bauer J. Bartschke J. A. L’huillier 《Applied physics. B, Lasers and optics》2011,105(4):715-720
A degenerate optical parametric oscillator (OPO) using an MgO:PPLN crystal and a volume Bragg grating (VBG) output coupler
is presented. By changing the temperature of the VBG, the resonance of the OPO can be tuned exactly on the degeneracy point.
A single-longitudinal and a multi-longitudinal mode pump scheme as well as the performance of the optical parametric oscillator
on and off degeneracy are compared. It was found that the multi-longitudinal mode pump setup provides superior results with
respect to spectral width and stability at degeneracy. At 2128.4 nm, a spectral width of less than 0.7 nm, an output power
of 1.7 W with a slope efficiency of 31.8%, and low power fluctuation of 0.3% were achieved. 相似文献
7.
The effect of resonator length on ZnGeP2 doubly resonant optical parametric oscillator was reported in this letter. With the employment of a Tm,Ho:GdVO4 laser as the pump source at 2.05 μm, we have found that there are obvious peaks of the output power when the resonator lengths
are matched to the length of the pump source. The ZGP OPO can generate a maximum output power of 4.27 W at 3.80 μm signal
and 4.45 μm idler when the resonator length matches that of the pump source. 相似文献
8.
4 (KTA) optical parametric oscillator (OPO) synchronously pumped by a cw diode-pumped mode-locked Nd:YVO4 oscillator–amplifier system. The laser system (pumped by 84 W of cw 808-nm diode radiation) generates 7-ps-long pulses at
1.064 μm with a repetition rate of 83.4 MHz and an average power of 29 W. The OPO, synchronously pumped by the 1.064-μm laser
pulses, consists of a 15-mm-long KTA crystal (cut for type II noncritical phase-matching) in a folded signal resonant linear
resonator. The average powers of the 1.54-μm signal radiation and the 3.47-μm idler radiation are 14.6 W and 6.4 W, respectively.
The total OPO output of 21 W corresponds to an internal efficiency of 75%. The experimental investigations include measurements
of the OPO output power (and its dependence on the pump power, the transmission of the output coupler, and the resonator length)
and of the pulse properties (such as pulse duration and spectral width). The measured results are in good agreement with the
predictions of a numerical analysis based on a split-step Fourier method.
Received: 4 May 1998 相似文献
9.
M. Henriksson M. Tiihonen V. Pasiskevicius F. Laurell 《Applied physics. B, Lasers and optics》2007,88(1):37-41
The total pulse energy of the signal and idler in a near-degenerate type-I periodically poled KTiOPO4 (PPKTP) optical parametrical oscillator (OPO) was spectrally confined within a 2 nm spectral bandwidth at 2.13 μm. This was
achieved by using a volume Bragg grating as the output coupler. Both the signal and the idler from the PPKTP OPO were then
simultaneously used to pump a mid-infrared ZnGeP2 (ZGP) OPO. The 2 nm bandwidth was narrower than the ZGP crystal acceptance bandwidth and, thus, made efficient conversion
in the second OPO possible. A total slope efficiency of 10% from 1.06 μm to the 3.5–5 μm region was demonstrated, generating
250 μJ in the mid-IR with only 3.6 mJ of 1.06 μm pump energy. This corresponds to a Nd:YAG pump to mid-IR conversion efficiency
of 7%.
PACS 42.65.Yj; 42.72.Ai; 42.40.Eq 相似文献
10.
J.-M. Melkonian A. Godard M. Lefebvre E. Rosencher 《Applied physics. B, Lasers and optics》2007,86(4):633-642
It is known that the idler conversion efficiency of optical parametric oscillators (OPOs) can be increased by adding a second
nonlinear crystal in the cavity. This crystal is pumped by the signal and acts as an optical parametric amplifier (OPA) for
the idler. However, this technique unavoidably increases the oscillation threshold because of additional losses and increased
build-up time due to cavity lengthening. In this paper, we investigate both theoretically and experimentally the benefits
and drawbacks of this so called OPO–OPA configuration versus the singly resonant OPO (SRO) configuration. Calculations are
found to be in agreement with an experimental study of a SRO and an OPO–OPA operating near 3.4 μm both pumped by a 90-mJ 27-ns
Nd:YAG laser. Our study reveals that the OPO–OPA needs to be driven at least two times above threshold to produce more idler
energy than the SRO. In addition, near 3 μm the OPO–OPA is particularly efficient given that the difference frequency wave
generated in the second crystal is also output coupled.
PACS 42.65.Yj; 42.65.Sf 相似文献
11.
A continuous wave (CW), extra-cavity singly resonant optical parametric oscillator (SRO) has been demonstrated. The SRO is
based on 5% magnesium-oxide doped periodically-poled lithium niobate (MgO:PPLN) pumped by a CW Nd:YVO4/YVO4 ring laser centered at 1064.4 nm. The nonlinear crystal temperature is kept at 120.0 ± 0.1°C and a domain period of 30 μm
is used in this experiment. When the pump power is 11 W, an output power of 2.0 W at the idler wavelength of 3.479 μm has
been obtained from the OPO. The optical-optical conversion efficiency is about 18.2%, and the slope efficiency is about 20.8%. 相似文献
12.
Single axial mode operation (<200 MHz optical bandwidth) of a high repetition rate periodically poled lithium niobate optical
parametric oscillator (OPO) has been obtained at signal wavelengths between 1.46 μm and 1.64 μm. OPO signal slope efficiencies
of 35% have been measured for repetition rates of 5–20 kHz. Single mode operation required spectral narrowing of both the
pump laser and the OPO. A simple technique of prelase Q-switching was implemented to reduce the optical bandwidth of the cw diode-pumped Nd:YAG pump laser to <1 GHz. A single intracavity
étalon was then sufficient to ensure single frequency oscillation of the OPO signal. The OPO output was stable with a smooth
spatial profile and an M
2 value of 1.3.
Received: 29 September 1999 / Published online: 27 January 2000 相似文献
13.
A single resonator 8.30 μm ZnGeP2 (ZGP) optical parametric oscillators (OPO) was reported in the paper. The OPO was pumped by a 10.2-W Tm,Ho:GdVO4 laser at 8 kHz in a Q-switch mode, a 170-mW idler was obtained at 8.30 μm, and the output power of the idler and signal wave
was 1.0 W, corresponding to an optical-optical conversion efficiency of 10.3% and a slope efficiency of 20.9%. Tm,Ho:GdVO4 laser was pumped by a 30-W fiber-coupled laser diode (LD) at the center wavelength of 801 nm. The output wavelength of Tm,Ho:GdVO4 laser was at 2.05 μm, and the energy per pulse of 1.28 mJ in 18 ns was achieved at 8 kHz with the peak power of 71.1 kW. 相似文献
14.
We present in this paper a highly stable and efficient KTP-based intracavity optical parametric oscillator with a diode-end-pumped
Nd:YVO4/Cr:YAG passively Q-switched laser. At the incident diode pump power of 4 W, the signal (1.57 μm) and idler (3.29 μm) average
output powers up to 580 and 100 mW, respectively, have been achieved. The corresponding conversion efficiency from the input
diode pump power to the output signal power is 14.5%, while that to the total OPO output (signal+idler) reaches 17%. To the
best of our knowledge, these are the highest conversion efficiencies reported to date. After more than four hours of investigation,
the OPO power stability better than 2% has been obtained. In addition, efficient cavity dumping of the IOPO has inevitably
led to the short pulse duration (1.6 ns) and high peak power output (8.3 kW) at the signal wave. Additionally, the amplitude
and repetition rate fluctuations of the signal pulses are well within 5%.
PACS 42.55.Xi; 42.60.Gd; 42.60.Lh; 42.65.Yj 相似文献
15.
We present in this report an efficient KTP-based intracavity optical parametric oscillator driven by a diode-pumped Nd:GdVO4/Cr:YAG passively Q-switched laser. For the first time, a novel folded cavity configuration was employed to set the KTP and
Cr:YAG crystals separately at different fundamental beam waists. Based on the ABCD-matrix theory and by taking the thermal
lens effect into account, the laser cavity was well optimized to enhance the OPO performance. A diode pump threshold as low
as 1.2 W and a maximum signal (1.57 μm) average output power up to 560 mW have been achieved. Efficient energy transfer in
the IOPO leads to short pulse duration (1.8–2.6 ns) and high peak power (6.8 kW) output at 1.57 μm. Additionally, the correlation
dynamics between the pump laser and the OPO was analyzed in detail. 相似文献
16.
A CW seeded femtosecond optical parametric amplifier, a compromise between OPG/OPA and strongly seeded OPA configurations,
has been demonstrated. An independent CW Nd: YAG laser with sub-watt power decreases the pump threshold of the OPA and improves
the stability of the output pulses considerably. Output signal energies as high as 30 μJ with pulse durations less than 250
fs near 1 μm are reported. from this two-stage device. 相似文献
17.
Optical parametric oscillators for high pulse energy and high average power operation based on large aperture periodically poled KTP and RTA 总被引:3,自引:0,他引:3
M. Peltz U. Bäder A. Borsutzky R. Wallenstein J. Hellström H. Karlsson V. Pasiskevicius F. Laurell 《Applied physics. B, Lasers and optics》2001,73(7):663-670
We report on optical parametric oscillators (OPOs) based on large aperture periodically poled KTiOPO4 (PPKTP) and RbTiOAsO4 (PPRTA) pumped with high pulse energy and high average power Q-switched solid-state lasers. The OPOs were pumped with 1064-nm
pulses of a diode-pumped Nd:YVO4 laser at 20 kHz repetition rate. The emitted signal wavelengths were 1.72 μm and 1.58 μm and the idler wavelengths were 2.79 μm
and 3.26 μm, respectively. Pumping the PPKTP OPO with 7.2 W and the PPRTA OPO with 8 W average power, 2 W and 1.3 W total
OPO output powers were generated. Two-dimensional measurements of the total OPO output power, the signal wavelength and the
signal bandwidth in dependence on the crystal location indicated a good uniformity of the quasiphasematching structure over
the entire 3-mm-thick crystals. This allowed pumping with larger pump beams and therefore with pulse energies of tens of millijoules.
Pumping with different flash-lamp-pumped lasers, good OPO performance and high output pulse energies could be achieved for
all pump lasers. Maximum input pulse energies of 56 mJ gave output pulse energies of as much as 18 mJ. The temperature tuning
behaviors of both OPOs were measured, showing excellent agreement with calculated temperature tuning curves. New equations
for temperature dispersion in RTA are presented. These results show that large-aperture PPKTP and PPRTA crystals are well
suited for tunable nanosecond OPO operation with multi-watt average pump power and several tens of millijoules pump pulse
energies.
Received: 7 September 2001 / Published online: 7 November 2001 相似文献
18.
A method of generating 1.57 μm pulse-series eye-safe laser based on optical parametric oscillator (OPO) was developed. The
1.57 μm pulse-series OPO was pumped by a Q-switched Nd:YAG laser with a variable reflectivity unstable resonator. Every pulse-series
includes three micro-pulses, and the pulse repetition rates, pulse numbers and pulse intervals were adjustable. The maximum
output energy of the 3-micro-pulse-series was 274 mJ. The optical-optical efficiency of the OPO was about 40%. 相似文献
19.
High-power picosecond LiB3O5 optical parametric oscillators tunable in the blue spectral range 总被引:2,自引:0,他引:2
The paper reports on an experimental investigation and numerical analysis of noncritically and critically phasematched LiB3O5 (LBO) optical parametric oscillators (OPOs) synchronously pumped by the third harmonic of a cw diode-pumped mode-locked Nd:YVO4 oscillator–amplifier system. The laser system generates 9.0 W of 355-nm mode-locked radiation with a pulse duration of 7.5 ps
and a repetition rate of 84 MHz. The LBO OPO, synchronously pumped by the 355-nm pulses, generates a signal wave tunable in
the blue spectral range 457–479 nm. With a power of up to 5.0 W at 462 nm and 1.7 W at 1535 nm the conversion efficiency is
74%. The OPO is characterized experimentally by measuring the output power (and its dependence on the pump power, the transmission
of the output coupler and the resonator length) and the pulse properties (such as pulse duration and spectral width). Also
the beam quality of the resonant and nonresonant waves is investigated. The measured results are compared with the predictions
of a numerical analysis for Gaussian laser and OPO beams. In addition to the blue-signal output visible-red 629-nm radiation
is generated by sum-frequency mixing of the 1.535-μm infrared idler wave with the residual 1.064-μm laser radiation. A power
of 1.25 W of 1.535-μm idler radiation and 5.7 W of 1.064-μm laser light generated a red 629-nm output power of 2.25 W.
Received: 2 February 2000 / Revised version: 28 July 2000 / Published online: 22 November 2000 相似文献
20.
We report a continuous-wave singly resonant optical parametric oscillator (SRO) with more than 12 W of idler power at 3414
nm when it was operated at 30°C. The SRO was directly pumped by a single-frequency, ytterbium-doped fiber laser with 49 W
linear polarization pump powers, and based on 50 mm long periodically poled MgO:LiNbO3 crystal (PPMgLN) in two-mirror linear cavity with 30.5 μm grating period. It’s pump power at threshold was 5.4 W. The slope-efficiency
and quantum-limited performance reached 26 and 79.2%, respectively. The beam polarization matched the e → e + e interaction in crystal. The idler waves were temperature tuned in the range of 3654 to 3811 nm and 3248 to 3414 nm based
on two 50 mm long PPMgLN with 29.5 and 30.5 μm grating period. To the best of our knowledge, this is the highest continuouswave
mid-IR output obtained for a fiber laser pumped optical parametric oscillator (OPO). 相似文献