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All-optical phase modulation system of quantum cascade laser

A quantum cascade and phase modulation technology, which is applied in the field of infrared laser spectroscopy and free space infrared optical communication, can solve the problems of large phase modulation coefficient, difficulty in obtaining high modulation coefficient pure phase modulation technology, and difficulty in realizing phase modulation, etc., to achieve High phase modulation coefficient, avoiding the effect of laser output intensity variation

Active Publication Date: 2012-03-28
CHONGQING UNIV
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Problems solved by technology

However, due to the influence of the parasitic capacitance of the quantum cascade laser itself, the modulation speed is greatly limited, so it is difficult to achieve high-speed phase modulation with current modulation
[0003] Although the fast wavelength modulation of quantum cascade lasers has been reported by the method of all-optical modulation, however, the reported modulation method cannot achieve a large phase due to the limitation of the penetration depth of the modulated beam in the quantum cascade laser. Modulation factor
Moreover, this method cannot avoid changing the output light intensity of the quantum cascade laser while generating phase modulation, so it is difficult to achieve simple phase modulation
These make it difficult to obtain a pure phase modulation technology with high speed and high modulation coefficient in the infrared spectrum range, which greatly limits the development of infrared laser spectroscopy technology and free space infrared optical communication technology

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Embodiment Construction

[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] The all-optical phase modulation quantum cascade laser used in the present invention can be manufactured by using existing technologies, such as molecular beam epitaxy equipment or metal organic compound chemical vapor deposition equipment.

[0028] Such as Figure 1 (a) As shown, the all-optical phase modulation quantum cascade laser is the basic structure of the manufactured quantum cascade laser (including: laser optical waveguide cladding A2, laser gain medium A5 and substrate A3, where gain medium A5 is a number of pairs of injection regions Formed in series with the active area, see figure 2 ), cut the laser along the direction of the laser cavity (that is, the X direction in the figure), and the cutting surface is on the plane shown by the dotted line in Figure 1, so that the laser gain medium A5 is exposed to form a quantum cascade l...

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Abstract

The invention relates to an all-optical phase modulation system of a quantum cascade laser, wherein the system comprises a quantum cascade laser and an externally modulated light source. On the basis of a basic structure of a traditional quantum cascade laser, a quantum cascade laser working area, an all-optical phase modulation area of the quantum cascade laser, and an all-optical phase modulation optical window of the quantum cascade laser are manufactured. Besides, the externally modulated light source is utilized to generate a modulation light by modulating the light intensity; a free electron and a cavity are excited in a laser gain medium of the whole all-optical phase modulation area of the quantum cascade laser through the all-optical phase modulation optical window of the quantumcascade laser; and carrier concentrations of a conduction band (the electron) and a valence band (the cavity) are changed, so that an effective refractive index of an infrared laser in a resonant cavity of the quantum cascade laser is changed; and therefore, phase modulation on a high-speed and high-modulation coefficient of the quantum cascade laser is realized. According to the invention, the provided all-optical phase modulation system of the quantum cascade laser can be applied to a high-sensitive infrared laser spectrum technology and high speed frequency modulation infrared optical communication of free space.

Description

technical field [0001] The invention belongs to the field of infrared laser spectrum technology and free space infrared optical communication technology, and in particular relates to an all-optical phase modulation system based on an infrared quantum cascade laser. Modulation can be applied to high-sensitivity infrared laser spectroscopy technology and free space high-speed frequency modulation infrared optical communication. Background technique [0002] In the prior art, high-speed pure phase modulation of quantum cascade lasers cannot be realized yet. The current phase modulation usually uses a sinusoidal current to change the temperature or carrier (electron) concentration of the quantum cascade laser resonator, and then change the effective cavity length of the quantum cascade laser resonator, so as to realize the phase modulation of the laser output. However, due to the influence of the parasitic capacitance of the quantum cascade laser itself, the modulation speed is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/34H01S5/06
Inventor 陈刚赖纳·马汀尼温中泉彭琛
Owner CHONGQING UNIV
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