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產(chǎn)品明細(xì)：

DPEM-460A光彈調(diào)制器是一種高速、大口徑、寬波段、高損傷閾值、大接受角度的調(diào)制器。其工作原理和電光調(diào)制器很像，也是控制快軸和慢軸之間的相位差的改變，從而控制透過(guò)光束的偏振的變化。光彈調(diào)制器（photoelastic modulators）可以通過(guò)對(duì)線偏振光添一定的相位差使輸出光在圓偏振、橢圓偏振、線偏振等狀態(tài)之間井進(jìn)行變化，同時(shí)光彈調(diào)制器（PEM）還可以使光在左旋、右旋兩種狀態(tài)之間進(jìn)行切換

DPEM-460A光彈調(diào)制器對(duì)比聲光調(diào)制器、電光調(diào)制器、液晶調(diào)制器的獨(dú)特之處包括：
大通光孔徑（15到30mm，標(biāo)準(zhǔn)），同時(shí)保持很高的調(diào)制器頻率
超大接受角度（市場(chǎng)角）范圍（+/- 20°）
波長(zhǎng)覆蓋范圍大（170nm~10um，F(xiàn)IR~THz）
高損傷閾值
可控制相位延遲
DPEM-460A通常對(duì)偏振態(tài)進(jìn)行測(cè)量時(shí)，如果只使用一個(gè)光彈調(diào)制器，則需要進(jìn)行兩次測(cè)量才能得到全部的信息，即在光彈調(diào)制完成第一測(cè)量后，需要旋轉(zhuǎn)45度在進(jìn)行一次同樣的測(cè)量。雙光彈調(diào)制器則只需一次測(cè)量即可得到所需信息，這就是實(shí)時(shí)測(cè)量成為可能。

Hinds Instruments提供多種雙光彈調(diào)制器的選項(xiàng)，型號(hào)如下：
PEM 100 I/FS50-60
PEM 100 II/FS20-23
PEM 100 II/FS42-47
PEM 100 II/ZS37-50

I/FS50-40（I/FS50-55, I/FS47-50）使用I系列光彈調(diào)制器。系列I的光學(xué)部件為八邊形，口徑有限，適用于較小光斑。因此，當(dāng)只有一束激光入射時(shí)，I系列光彈調(diào)制器一般可以滿足要求。
II/FS20-23和II/FS42-47系統(tǒng)同樣為熔融石英材料，在170nm到2.6um擁有高透射率。兩種型號(hào)在可見(jiàn)光和近紅外都適用。II/FS20-23系統(tǒng)擁有更大的口徑。如果光斑較大或者是多束光束時(shí)可以選擇II/FS20-23。雙光彈調(diào)制器通常用于測(cè)量斯托克斯量，用于測(cè)量氘原子發(fā)射到托卡馬克等離子體的光束的偏振態(tài)。II/42-47也可用于測(cè)量斯托克斯量并且擁有更加緊湊的光學(xué)頭。II/ZS37-50為光學(xué)頭材料為ZnSe，波長(zhǎng)范圍為2-18um，用于近紅外光譜，頁(yè)可用于寬帶光源或者近紅外激光，例如CO2激光器。

DPEM-460A

英語(yǔ)明細(xì):

The DPEM-460A photoelastic modulator is a kind of modulator with high speed, large aperture, wide band, high damage threshold and large acceptance Angle. It works much like an electro-optic modulator, controlling the change in the phase difference between the fast axis and the slow axis, thereby controlling the change in the polarization of the transmitted beam. photoelastic modulators can change the output light between circular polarization, elliptic polarization, linear polarization and other states by adding a certain phase difference to the linearly polarized light, and at the same time, the photoelastic modulators (PEM) can also switch the light between left and right rotation states

The unique features of the DPEM-460A photoelastic modulator compared to acousto-optic modulators, electro-optic modulators, and liquid crystal modulators include:
Large light aperture (15 to 30mm, standard) while maintaining a high modulator frequency
Large acceptance Angle (market Angle) range (+/ -20 °)
Large wavelength coverage (170nm~10um, FIR~THz)
High damage threshold
Phase delay can be controlled
Dpm-460a is usually used to measure the polarization state, if only one photoelastic modulator is used, two measurements are needed to get the full information, that is, after the photoelastic modulation is completed, the same measurement needs to be rotated 45 degrees. The dual photoelastic modulator only needs one measurement to obtain the required information, which makes real-time measurement possible.

Hinds Instruments offers several options for dual photoelastic modulators in the following models:
PEM 100 I/FS50-60
PEM 100 II/FS20-23
PEM 100 II/FS42-47
PEM 100 II/ZS37-50

I/FS50-40 (I/FS50-55, I/FS47-50) uses the I series photoelastic modulator. Series I optical components are octagonal, limited aperture, suitable for smaller light spots. Therefore, when only one laser beam incident, the I series photoelastic modulator can generally meet the requirements.
The II/FS20-23 and II/FS42-47 systems are also fused quartz materials with high transmittance from 170nm to 2.6um. Both models are suitable for visible light and near infrared. The II/FS20-23 system has a larger caliber. If the spot is large or there are multiple beams, II/FS20-23 can be selected. A dual photoelastic modulator is commonly used to measure the Stokes quantity, which is used to measure the polarization state of the beam emitted by the deuterium atom into the Tokamak plasma. The II/42-47 can also be used to measure Stokes quantities and has a more compact optical head. II/ZS37-50 is an optical head material ZnSe with a wavelength range of 2-18um for near infrared spectroscopy, and the page can be used for broadband light sources or near infrared lasers, such as CO2 lasers.

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