We analytically find an approximate Bloch-Messiah reduction of a noncollinear parametric amplifier pumped with a focused monochromatic beam. We consider type I phase matching. The results are obtained using a perturbative expansion and scaled to a high gain regime. They allow a straightforward maximization of the signal gain and minimization of the parametric fluorescence noise. We find the fundamental mode of the amplifier, which is an elliptic Gaussian defining the optimal seed beam shape. We conclude that the output of the amplifier should be stripped of higher order modes, which are approximately Hermite-Gaussian beams. Alternatively, the pump waist can be adjusted such that the amount of noise produced in the higher order modes is minimized.
We report parametric gain by utilizing $ χ^{(2)} $ non-linearities in a semiconductor Bragg Reflection Waveguide (BRW) waveguide chip. Under the two-mode degenerate type II phase matching, it can be shown that more than 18 dBs of parametric gain for both TE and TM modes is tenable in 100s of micrometers of device length. Polarization insensitive parametric gain can be attained within the 1550 nm region of the spectrum. These AlGaAs BRW waveguides exhibit sub-photon per pulse sensitivity. This is in sharp contrast to other types of parametric gain devices which utilize $ χ^{(3)} $, where the pu…
The ability to amplify optical signals is of pivotal importance across science and technology. The development of optical amplifiers has revolutionized optical communications, which are today pervasively used in virtually all sensing and communication applications of coherent laser sources. In the telecommunication bands, optical amplifiers typically utilize gain media based on III-V semiconductors or rare-earth-doped fibers. Another way to amplify optical signals is to utilize the Kerr nonlinearity of optical fibers or waveguides via parametric processes. Such parametric amplifiers of travell…
Sub 100-fs, 5.2-$μ$m ZGP Parametric Amplifier Driven by a ps Ho:YAG Chirped Pulse Amplifier and its application to high harmonic generation
Vienna University of Technology（维也纳工业大学）；The University of Tokyo（东京大学）；Menlo Systems GmbH（Menlo Systems有限公司）；University of Erlangen-Nuremberg（埃尔朗根-纽伦堡大学）；Center for Physical Sciences & Technology（物理科学和技术中心）
Quantum Battery Enhancement via Degenerate Optical Parametric Amplifier and Common Reservoirs
Northeast Normal University（东北师范大学）；Shenyang Normal University（沈阳师范大学）；RIKEN Center for Quantum Computing (RQC)（理化学研究所量子计算中心）；Ludong University（鲁东大学）；Shangrao Normal University（上饶师范学院）
We report on a μJ-scale mid-infrared optical parametric amplifier (OPA) based on the recently developed wide-bandgap orthorhombic crystal, BaGa4S7 (BGS), and directly compare its performance to that of LiGaS2 (LGS) in the same OPA setup. The source is based on a single OPA stage amplifying supercontinuum seed pulses with a quantum efficiency of 29{\%} at an idler wavelength of 10 μm, featuring nominally carrier-envelope phase-stable pulses. As a result of pumping the OPA directly at 1 μm, the overall conversion efficiency far exceeds that of traditional schemes based on OPA's followed by diffe…
Photon Blockade Mediated by Two-Photon Absorption in an Optical Parametric Amplifier
School of Optical and Electronic Information, Huazhong University of Science and Technology（华中科技大学光学与电子信息学院）；Synopsys, Inc.（新思科技）；Elmore Family School of Electrical and Computer Engineering, Purdue University（普渡大学埃尔莫电气与计算机工程学院）
