共查询到20条相似文献,搜索用时 625 毫秒
1.
J. G. Rarity P. R. Tapster J. A. Levenson J. C. Garreau I. Abram J. Mertz T. Debuisschert A. Heidmann C. Fabre E. Giacobino 《Applied physics. B, Lasers and optics》1992,55(3):250-257
We discuss recent progress in the study of the non-classical properties of light beams generated by non-degenerate parametric splitting in (2) nonlinear birefringent crystals, with special emphasis on their quantum correlation (twin beams). We describe experimental results using successively pure parametric fluorescence, parametric amplification of a weak signal beam pumped by a pulsed laser, and parametric oscillation in a cavity pumped by a cw laser. In this review, we compare the respective advantages and drawbacks of the different approaches. 相似文献
2.
Nearly transform limited femtosecond pulses tunable between 2.56 and 3.16 m have been generated by optical parametric amplification. The single stage parametric amplifier is pumped by a tunable high power femtosecond Ti:sapphire laser system at 1 kHz repetition rate and seeded by quasi-continuous wave (cw) radiation from the Q-switched Nd:YLF laser used to pump the regenerative amplifier. The 100 fs idler pulses are shorter than the pump pulses. The mechanism of the achieved pulse compression is discussed and experimental results are compared with numerical simulations. 相似文献
3.
High-efficiency mid-infrared ZnGeP2 optical parametric oscillator directly pumped by a lamp-pumped, Q-switched CrTmHo:YAG laser 总被引:1,自引:0,他引:1
We report a singly resonant optical parametric oscillator (SRO) based on a ZnGeP(2) crystal directly pumped by a lamp-pumped Q-switched CrTmHo:YAG laser. The IR was tunable from 4.7 to 7.8 microm via crystal angle tuning. A maximum optical to optical efficiency of 56% was obtained from the pump (2.09 microm) to total IR at a pump energy of 6.5 mJ. The corresponding idler energy was 1.45 mJ. The SRO was measured to have a slope efficiency of 64% and a threshold of 1 mJ. The spatial beam quality of the idler, characterized by the M(2) parameter, was 1.38 when the SRO was pumped at 2.5 times threshold. These results show that ZnGeP(2) optical parametric oscillators directly pumped by a CrTmHo:YAG laser can be operated efficiently, while maintaining good IR beam quality. 相似文献
4.
We present a synchronously pumped optical parametric oscillator (OPO) based on a single MgO-doped periodically poled lithium
niobate crystal (MgO:PPLN) delivering high-repetition-rate picosecond idler output in the mid-infrared. At high power levels,
cascaded optical parametric oscillations are observed, from which the forward and backward idler waves are generated in the
terahertz (THz) spectral region. We demonstrate the cascaded processes involving THz-wave generation and make explanations
for the highorder cascaded optical parametric processes. The cascaded terahertz optical parametric oscillations in a synchronously
pumped optical parametric oscillator are reported for the first time to the best of our knowledge. 相似文献
5.
根据信号波和闲频波所满足的耦合非线性薛定谔方程,导出了双抽运参量放大增益系数g、信号波的放大因子和闲频波转换效率,并在输入总抽运功率不变的情况下,仅改变双抽运功率P1,P2的比值s,对参量放大增益系数g、信号波的放大因子和闲频波转换效率理论研究和数值模拟;数值模拟结果表明:相位匹配条件下,通过改变双抽运功率的比值 ,可获得适当的放大的信号波和一定转换效率的闲频波。 相似文献
6.
根据信号波和闲频波所满足的耦合非线性薛定谔方程,导出了双抽运参量放大增益系数g、信号波的放大因子和闲频波转换效率,并在输入总抽运功率不变的情况下,仅改变双抽运功率P1,P2的比值s,对参量放大增益系数g、信号波的放大因子和闲频波转换效率理论研究和数值模拟;数值模拟结果表明:相位匹配条件下,通过改变双抽运功率的比值 ,可获得适当的放大的信号波和一定转换效率的闲频波。 相似文献
7.
8.
Hajime Okada Hiromitsu Kiriyama Michiaki Mori Yoshiki Nakai Takuya Shimomura Manabu Tanoue Shuji Kondo Shuhei Kanazawa Hiroyuki Daido Toyoaki Kimura Toshiki Tajima 《Optical Review》2009,16(1):1-3
We have demonstrated highly efficient broadband amplification by an optical parametric chirped pulse amplifier (OPCPA) system
that uses high energy seed pulses. The OPCPA consists of three type I B-barium borate (BBO) crystals pumped by a Q-switched
Nd:YAG laser. We successfully amplified the microjoule level seed pulses to 78 mJ with a pump-to-signal optical conversion
efficiency of 26% at a 10 Hz repetition rate. To our knowledge these results represent the most optically efficient OPCPA
to date pumped by a typical Q-switched laser. 相似文献
9.
We report a synchronously pumped intracavity frequency-doubled optical parametric oscillator that employs a single KTiOPO(4) crystal for both parametric generation and frequency doubling. Both nonlinear processes are phase matched for the same direction of propagation in the crystal. The parametric oscillator, pumped by a femtosecond Ti:sapphire laser at a wavelength of 745 nm, generates a green output beam at 540 nm with a 29% power conversion efficiency. Angle tuning in conjunction with pump wavelength tuning provides output tunability in the 530-585-nm range. 相似文献
10.
Simultaneous frequency up and down conversion using a biharmonically pumped parametric Raman laser (PRL) based on a KGd(WO4)2 (KGW) crystal has been demonstrated experimentally. Collimated beams have been generated for both the 1st anti-Stokes (1AS) at 511 nm and 2nd Stokes (2S) at 579 nm by four-wave parametric Raman interaction. To excite PRL biharmonically, we pumped the KGW crystal with 20 ps pulses at the fundamental 530 nm and its 1st Stokes component at 555 nm. The 1st Stokes pump beam was generated using stimulated Raman scattering in a separate KGW Raman oscillator. The energy conversion efficiencies reached experimentally were 10% for the 2S and 4% for the 1AS. 相似文献
11.
H. Zaidi N. C. Menicucci S. T. Flammia R. Bloomer M. Pysher O. Pfister 《Laser Physics》2008,18(5):659-666
We report on our research effort to generate large-scale multipartite optical-mode entanglement using as few physical resources as possible. We have previously shown that cluster-and GHZ-type N-partite continuous-variable entanglement can be obtained in an optical resonator that contains a suitably designed second-order nonlinear optical medium, pumped by at most \(\mathcal{O}\)(N 2) fields. In this paper, we show that the frequency comb of such a resonator can be entangled in an arbitrary number of independent 2 × 2 and 2 × 3 continuousvariable cluster states by a single optical parametric oscillator pumped by just a few optical modes. 相似文献
12.
A. Velten A. Zavadilová V. Kube?ek J.-C. Diels 《Applied physics. B, Lasers and optics》2010,98(1):13-25
A high conversion efficiency and stability are the anticipated advantages of intracavity pumped parametric oscillators, as
opposed to the traditional externally pumped ones. The dynamics of the coupled pump and signal cavities, however, is very
complex and poses a considerable design challenge. In this paper we present a simulation of an optical parametric oscillator,
pumped intracavity by a mode-locked solid-state laser. Different unstable modes of operation are identified in an experimental
setup and the simulation is used to reproduce and analyze them. Based on this analysis we present techniques to amplitude
stabilize the system. 相似文献
13.
Yasuo Horiuchi Yoshio Nishi Noburu Sokabe Akira Murai 《International Journal of Infrared and Millimeter Waves》1985,6(9):929-946
Sixty and three absorption transitions in D2CO and H2CO, respectively, have produced a number of far infrared laser lines when they are pumped by an etalon-tuned TE-CO2 laser. Almost all the absorption transitions pumped previously by a free runing TE-CO2 laser have been efficiently pumped by the etalon tuned CO2 laser and found to have offset within ±500 MHz from the line-center of the relevant CO2 pump lines. 22 (1) absorption and 63 (4) emission lines of D2CO (H2CO) are assigned. Some of these lines have generated superfluorescence. In paticular, the D2CO 319-m line pumped by CO2-9P(32) delivered an output energy of approximately one half that of the well-known D2O 66-m. It is shown that a large electric dipole moment and an appreciable amount of fractional population in the lower level of the pump transition of this line are responsible to the superfluorescence. 相似文献
14.
Generation of accurately synchronized pump source for optical parametric chirped pulse amplification
We demonstrate the generation of ultra-short pulses at 1064 nm by continuous-wave seeded non-collinear optical parametric amplification in a -barium borate crystal pumped by the second harmonics of a femtosecond Ti:sapphire laser. After two stages of seeded parametric amplifiers, the generated pulses at 1064 nm were accurately synchronized with the fundamental pump pulses, which could be used as seeding pulses for further amplification and then frequency doubling to produce an accurately synchronized pump source for optical parametric amplification of chirped pulses from the same Ti:sapphire laser. PACS 42.65.Re; 42.65.-k; 52.35.Mw 相似文献
15.
A repetition-rate-stabilized frequency comb ranging from the violet to the mid-infrared (0.4-2.4 microm) is obtained by phase locking a femtosecond Ti:sapphire laser and a synchronously pumped optical parametric oscillator to a common supercontinuum reference. The locking results have bandwidths lower than 3 kHz. By changing the locking frequencies, different relative and absolute offsets of the constituent frequency combs are achievable. 相似文献
16.
Coherent mid-IR sources based on orientation-patterned GaAs (OPGaAs) are of significant interest in diverse scientific, medical, and military applications. The generation of long-wavelength mid-IR beams in OPGaAs using optical parametric oscillation exhibits limitations in the obtainable pulse energy and peak power. The master oscillator power amplifier concept is demonstrated in OPGaAs, by which a mid-IR source based on optical parametric oscillation can be scaled to high energy by amplification of the output of the optical parametric oscillator in an optical parametric amplifier (OPA). A fivefold increase in the pulse energy is obtained using this method by amplifying 3.85μm pulses in an OPGaAs OPA pumped by a Th,Ho:YLF Q-switched laser. 相似文献
17.
The resonator length of an optical parametric oscillator (OPO) is normally made a short as possible to minimize the signal-buildup time and maximize the output energy. We have found that, when a doubly resonant OPO is pumped by a multilongitudinal-mode beam, its output energy has a significant maximum when its optical length matches that of the pump source, even if this length is much greater than the shortest possible for the OPO. We have observed this effect in a ZnGeP>(2)-based OPO and reproduced it in numerical simulations. 相似文献
18.
Renk KF Stahl BI Rogl A Janzen T Pavel'ev DG Koshurinov YI Ustinov V Zhukov A 《Physical review letters》2005,95(12):126801
We report a superlattice parametric oscillator (SPO), with a GaAs/AlAs superlattice as the active element. The SPO was pumped by a microwave field (power 4 mW) and produced third harmonic radiation at subterahertz frequencies (near 300 GHz; 0.1 mW). We attribute the parametric gain to the nonlinearity of the miniband transport. 相似文献
19.
Fuji T Ishii N Teisset CY Gu X Metzger T Baltuska A Forget N Kaplan D Galvanauskas A Krausz F 《Optics letters》2006,31(8):1103-1105
We demonstrate an optical parametric chirped-pulse amplifier producing infrared 20 fs (3-optical-cycle) pulses with a stable carrier-envelope phase. The amplifier is seeded with self-phase-stabilized pulses obtained by optical rectification of the output of an ultrabroadband Ti:sapphire oscillator. Energies of -80 microJ with a well-suppressed background of parametric superfluorescence and up to 400 microJ with a superfluorescence background are obtained from a two-stage parametric amplifier based on periodically poled LiNbO3 and LiTaO3 crystals. The parametric amplifier is pumped by an optically synchronized 1 kHz, 30 ps, 1053 nm Nd:YLF amplifier seeded by the same Ti:sapphire oscillator. 相似文献