Newport标准相位调制器

标准相位调制器

New Focus 标准相位调制器可用于各种波长范围、工作频率以及宽带或谐振模型，确保我们为您提供满足包括原子物理、激光频率稳定和高分辨率光谱在内的应用需求的解决方案。

工作频率覆盖范围很大，为 10 kHz 至 9.2 GHz

采用谐振设计，可提供极低驱动电压

宽波长范围

便于光学对准的机械孔径

对比	型号
	4002宽带相位调制器，DC-100 MHz，500-900 nm，8-32 和 M4
	4004宽带相位调制器，DC-100 MHz，900-1600 nm，8-32 和 M4
	4006Phase Modulator, Broadband, DC-100 MHz. 360-500 nm, 8-32 and M4

产品规格

型号	4002	4004	4006
类型	Broadband Phase Modulator	Broadband Phase Modulator	Broadband Phase Modulator
波长范围	500-900 nm	900-1600 nm	360-500 nm
工作频率	DC-100 MHz	DC-100 MHz	DC-100 MHz
材料	MgO:LiNbO3	MgO:LiNbO3	MgO:LiNbO3
孔径	Ø2 mm	Ø2 mm	Ø2 mm
VSWR	NA	NA	NA
输入功率	2 W/mm2 @ 532 nm	4 W/mm2 @ 1064 nm	0.1 W/mm2 @ 364 nm
电压	105 V @ 532 nm	210 V @ 1000 nm	79 V @ 364 nm
调制深度	30 mrad/V @ 532 nm	15 mrad/V @1000 nm	40 mrad/V @ 364 nm
射频功率	10 W	10 W	10 W
射频带宽	100 MHz	100 MHz	100 MHz
射频接头	SMA	SMA	SMA
输入阻抗	20 pF	20 pF	20 pF

特征

大工作频率范围覆盖

我们提供从直流到工作频率 9.2 GHz 的标准相位调制器。

Typical modulation depth of our resonant phase modulators plotted as a function of modulator frequency for three families of modulators.

采用谐振设计，可提供极低驱动电压

我们提供可用于宽频率范围的宽带调制器，以及在单一频率下工作同时驱动电压要求更低的谐振调制器。谐振调制器配有谐振槽路，以化从驱动器到晶体的功率传输，从而化晶体两端的电压，将所需驱动电压降低近 10 倍。每个谐振相位调制器都是根据您确切指定的频率构建的。

Typical RF drive power as a function of modulation depth. Phase shifts of 1, 2, 3, and 4 radians are represented by the dark blue, magenta, green and cyan, respectively.

Phase Modulator Bessel Functions

This spectrum of a phase-modulated electric field is given by Bessel functions. The optical intensity of each sideband is proportional to the square of the electric field amplitude.
The amplitude of the kth sideband is proportional to Jk(m), where Jk is the Bessel function of order k. The fraction of optical power transferred into each of the first-order sidebands is [J₁(m)]², and the fraction of optical power that remains in the carrier is [J₀(m)]².

典型 RF 驱动器功率与调制深度的函数关系图。1、2、3 和 4 弧度的相移分别由深蓝色、品红色、绿色和青色表示。

Phase Modulator Operation

图中所示为三个调制器系列中调制器频率和谐振相位调制器的典型调制深度之间的函数关系曲线。

When a phase modulator is used, the laser beam should be well collimated and its polarization should be oriented vertically to within 1°. For an unpolarized laser, the polarizer should have an extinction ratio greater than 100:1. We recommend our Glan-Thompson polarizers or our low-cost sheet polarizers.

便于光学对准的机械孔径

获得这种纯相位调制的关键是光束对晶体传播轴的良好光学对准以及激光器的电场与晶体的电光轴的精确取向。New Focus 使得准确对准更容易，只需简单地将光束穿过机械孔径。

Move Your Optical Isolator Instead of the Beam

Our multi-axis stages are designed for applications where precise positioning and high stability are required. Shown here is a typical application of aligning an optical modulator to a laser beam with our four-axis kinematic device alignment stage.

Observing Phase Modulation

A typical setup for observing phase modulation: a HeNe laser beam is sent through a Model 4001 resonant phase modulator operating at 29 MHz, and the beam is focused into an optical spectrum analyzer. The laser’s phase-modulated spectrum, with its characteristic frequency sidebands, is observed on an oscilloscope.

Laser Frequency Stabilization Application

A Model 4001/3 or 4061/3
resonant phase modulator is the ideal component to use in a Pound-Drever-Hall
laser frequency stabilization
system. This optical FM frequency discriminator technique* is used to lock the optical frequency of a laser to a stable Fabry-Perot reference cavity. The system consists of a single-frequency laser beam that is sinusoidally phase modulated and coupled into an axial mode of the Fabry-Perot resonator cavity. The stabilization signal is fed back to a high-voltage amplifier that drives a piezoelectric transducer (PZT). The frequency-stabilized light transmitted by the cavity is clean spatially as well as spectrally. *R.W.P. Drever, et al. “Laser Phase and Frequency Stabilization Using an Optical Resonator,” Appl. Phys. B31, pp. 97–105 (1983).

Diagram for a Pound-Drever-Hall laser-frequency-stabilization system.

配件

宽带模块驱动器

对比	描述
	3211高电压放大器，宽带调制器