CN1131580C - Frequency-stabilizing device of fiber-optical grating external cavity semiconductor laser and its frequency-stabilizing method - Google Patents

Frequency-stabilizing device of fiber-optical grating external cavity semiconductor laser and its frequency-stabilizing method Download PDF

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CN1131580C
CN1131580C CN 01136575 CN01136575A CN1131580C CN 1131580 C CN1131580 C CN 1131580C CN 01136575 CN01136575 CN 01136575 CN 01136575 A CN01136575 A CN 01136575A CN 1131580 C CN1131580 C CN 1131580C
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laser
frequency
fiber grating
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external cavity
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CN1341986A (en
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赵华凤
薛林
张汉一
钱进
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清华大学
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Abstract

本发明属于激光器光源的稳频技术领域,包括激光光源;乙炔气体吸收室;伺服反馈控制器;激光光源由量子阱FP型半导体激光管芯和一支光纤光栅构成的光纤光栅外腔半导体激光器,其中该半导体激光管芯与光纤光栅的耦合端面镀有增透膜,光纤光栅的另一端连有一准直器,该光纤光栅两端还连接有两块首尾相连的压电陶瓷;伺服反馈控制器中的锁相放大器的两个输入端和输出端分别与光探测器输出端、信号源和高压驱动源的一端相连,高压驱动源和信号源的另一端分别与两块压电陶瓷相连;在准直器与乙炔气体吸收室之间的光路上还设有一隔离器和一部分反射镜。 The present invention belongs to the laser source technical field of frequency stabilization, comprising a laser light source; acetylene gas absorption chamber; servo feedback controller; fiber grating external cavity semiconductor laser light source FP composed of a quantum well semiconductor laser and a fiber grating die, wherein the die and the semiconductor laser coupled to a fiber grating end surface is plated with anti-reflection coating, the other end of the fiber grating has a collimator connected, both ends of the fiber grating are also connected two end-connected to the piezoelectric ceramic; servo feedback controller two input terminals and output terminals, respectively, and lock-in amplifier output terminal end of the light detector, and a signal source connected to a high pressure drive source, the drive source and the other end of the high voltage source are connected to the two piezoceramic; in an optical path between the collimator and acetylene gas absorption chamber further provided with a spacer and a portion of the mirror. 本发明具有较高频率稳定性和极窄的激光线宽的优点,而且具有实现结构简单,机械稳定性高的特点。 The present invention has the advantage of high frequency stability and a very narrow linewidth laser and has the characteristics of simple structure, high mechanical stability.

Description

光纤光栅外腔半导体激光器的稳频装置及其稳频方法 Frequency stabilization means fiber grating external cavity semiconductor lasers, and frequency stabilization method

技术领域 FIELD

本发明属于激光器光源的稳频技术领域,特别涉及采用光纤光栅外腔半导体激光器的稳频方法。 Frequency stabilization Field The present invention belongs to the laser light source, particularly to a method of frequency stabilization using fiber grating external cavity semiconductor laser.

稳频技术的原理是:激光器输出的光送入鉴频器与参考频率比较,得到的频率误差信号送入伺服系统中,该系统通过反馈控制使激光频率锁定在参考频率上,实现激光器频率稳定。 Frequency stabilization principle is: a laser light output into the discriminator compared with the reference frequency, a frequency error signal is fed to the servo system, the system by feedback control of the laser frequency locked to the reference frequency, the laser frequency stability achieved . 目前稳频技术研究的热点是光通信窗口1.5μm通信波段。 Frequency stabilization technology research focus is the optical communication window 1.5μm band communication. 为了保证系统稳定工作和不同厂商设备互联,国际电信联盟组织(ITU-T)制定了该波段的信道频率标准。 To ensure system stability and network equipment from different manufacturers, the International Telecommunication Union (ITU-T) has developed the standard channel frequency band. 这就要求WDM通信光源频率必须严格工作在规定的频率上,这使得激光器的稳频十分必要。 This requires frequency sources must be strictly WDM communication on the predetermined working frequency so that the laser frequency stabilization is necessary. 现在已有采用法布里-珀罗腔(FP)、光纤法布里-珀罗腔(FFP)、波导光栅阵列(AWG)和光纤光栅(FBG)等人工器件作为鉴频器的稳频半导体激光器的报道,但由于人工器件的长期稳定度都不高,所以很难获得较高的频率稳定度;利用原子能级跃迁和分子振转谱线作为参考频率可以实现相当高的稳频精度,在1.5μm波段目前发现可利用的吸收谱线有铷(Ru)、氪(Kr)、氨气(NH3)、乙炔(C2H2)和氢化氰(HCN)等。 Now has Fabry - Perot (FP), Fabry - Perot (FFP), an array waveguide grating (AWG) and a fiber grating (FBG) and other artificial device as a frequency-stabilized semiconductor discriminator lasers reported, but the long-term stability of the artificial device is not high, it is difficult to obtain a high frequency stability; the use of atomic energy levels and transitions of vibrational or rotational line can achieve a very high frequency stabilization accuracy as a reference frequency, in 1.5μm band now been found that the absorption lines has available rubidium (Ru), krypton (Kr), ammonia (NH3), acetylene (the C2H2) and hydrogen cyanide (HCN) and the like. 国外已有若干利用这些谱线实现激光器稳频的报道:1989年M.Ohtsu和E.Ikegami利用二倍频信号锁定在Ru原子谱线实现1.56μmDFB激光器稳频;1988年YCChung和CBRoxlo报道利用气体放电下的Kr1.533μm原子跃迁谱线实现对DFB激光器的稳频;1989年日本NTT公司报道了利用12C2H2在1.53μm和13C2H2在1.55μm的吸收谱线实现分布反馈激光器(DFB)的稳频。 Several foreign countries have been achieved using a laser frequency stabilization of these lines reported: 1989 M.Ohtsu E.Ikegami and double frequency signal using Ru atomic line locked lasers to achieve frequency stabilization 1.56μmDFB; YCChung 1988 and reported by the gas CBRoxlo Kr1.533μm atomic transition line discharge at DFB lasers to achieve frequency stabilization; NTT company in Japan in 1989 reported using 12C2H2 in 1.53μm and achieve steady 13C2H2 absorption lines 1.55μm distributed feedback laser (DFB) frequency.

上述稳频方案中所用激光光源为DFB或体光栅外腔半导体激光器。 The above frequency stabilization scheme used in the laser light source is a DFB or volume grating external cavity semiconductor lasers.

已有的一种DFB激光器的典型稳频装置如图1所示,该装置为利用乙炔气体在1.53μm附近的吸收谱线实现DFB激光器稳频的示意图。 A typical DFB laser has a frequency stabilization apparatus shown in FIG. 1, a schematic diagram of the DFB laser frequency stabilization means is implemented using acetylene gas absorption lines in the vicinity of 1.53μm. 整个系统由激光光源、乙炔气体吸收室(鉴频器)和伺服反馈控制器三部分组成。 The system consists of three parts, a laser light source, acetylene gas absorption chamber (discriminator) and the servo feedback controller. 其中激光光源包括DFB激光器、激光电流源和温度控制器;伺服反馈控制器包括光探测器、锁相放大器和正弦信号源。 Wherein the laser source comprises a DFB laser, the laser current source and a temperature controller; servo feedback controller comprises a photodetector, lock-in amplifier, and a sinusoidal signal source. 该装置的稳频方法为:DFB激光器的输出光由于正弦信号源对激光器注入电流的调制而频率调制;激光器输出光经过乙炔气体吸收室后,激光器频率与乙炔吸收峰的频率偏差值转化为光强调制信号;该输出信号经探测器变为电信号锁相放大器处理后得到的反馈控制信号送入激光电流源,调整注入激光器电流大小,使激光器的工作频率调整到乙炔吸收峰中心上。 Frequency stabilization method of the device of: the output of the DFB laser light due to the sinusoidal signal source for the laser modulation current is injected and the frequency modulation; the laser output through the acetylene gas absorption cell, the laser frequency acetylene frequency deviation of the absorbing peak into light intensity modulation signal; the detector output signal becomes a feedback control signal obtained by processing the electric signal into the lock-in amplifier laser current source, a current injection laser to adjust the size, the working frequency of the laser is adjusted to the center of the peak absorption of acetylene. 由于DFB激光器的线宽较宽,频率随温度和电流漂移较严重,这些都影响到稳频系统的频率稳定度。 Since the DFB laser linewidth is wider frequency current drift with temperature and more severe, which affect the frequency stability of the frequency stabilization system.

体光栅外腔半导体激光器由于是外腔激光器,所以线宽窄,光源单模特性好,可用作稳频系统光源。 Volume grating external cavity semiconductor lasers is due to the external cavity laser, the line width, single mode light is good, it can be used as a light source frequency stabilization system. 已有的一种体光栅外腔半导体激光器的稳频装置的典型结构如图2所示。 A typical configuration of frequency stabilization means has a volume grating external cavity semiconductor laser shown in FIG. 该装置仍由激光光源11、气体吸收室(鉴频器)12和伺服反馈控制器三部分组成,其中激光光源采用体光栅外腔半导体激光器11,一般将外腔镜或体光栅装在压电陶瓷上。 The laser light source apparatus 11 still, the gas absorption chamber (discriminator) 12 and III servo feedback controller, wherein the laser light source body grating external cavity semiconductor laser 11, generally the outer mirror mounted on a piezoelectric or volume grating ceramic. 只是其稳频方法有两点不同:(1)激光器频率控制是通过改变激光器外腔长实现的,该伺服反馈控制器输出的电压信号加在压电陶瓷上,从而改变外腔激光器的腔长,也就改变了激光输出频率;(2)激光器的频率调制是用外调制器实现的,这是因为外腔激光器腔长较长,所以电流频率调制效果不好,只能用外调制器获得频率调制。 Except that there are two different frequency stabilization method: (1) the laser frequency is controlled by changing the laser external cavity length achieved, feedback voltage signal to the servo controller output is applied to the piezoelectric ceramic, thereby changing the cavity length of the external cavity laser , also changes the frequency of the laser output; frequency modulation (2) laser with an external modulator is achieved, since long external cavity laser cavity length, current frequency modulation so good effect, can only be obtained by an external modulator frequency modulation. 这种体光栅外腔半导体激光器一般结构包括激光器管芯、透镜、反射镜和体光栅,结构复杂,而且机械稳定性差,价格昂贵,这是该光源作为稳频系统光源的不足。 This volume grating external cavity semiconductor lasers typically comprise a laser die structure, a lens, a mirror and a grating body, complex structure, and poor mechanical stability, is expensive, which is insufficient as the light source of frequency stabilization system.

本发明提出的一种光纤光栅外腔半导体激光稳频装置,包括由激光器及其温度控制器和电流源组成的激光光源;由乙炔气体吸收室构成的鉴频器;由光探测器、锁相放大器、信号源和高压驱动源组成的伺服反馈控制器;其特征在于,所说的激光器由量子阱FP型半导体激光管芯和一支光纤光栅构成的光纤光栅外腔半导体激光器,其中该半导体激光管芯与光纤光栅的耦合端面镀有增透膜,光纤光栅的另一端连有一准直器,该光纤光栅两端还连接有两块首尾相连的压电陶瓷;所说的伺服反馈控制器中的锁相放大器的两个输入端分别与所说的光探测器输出端和所说的信号源的一端相连,该锁相放大器的输出端连于高压驱动源的一端,该高压驱动源和信号源的另一端分别与所说的两块压电陶瓷相连;在该准直器与乙炔气体吸收室之间的光路上还设有一隔离器 An optical fiber grating external cavity semiconductor laser of the present invention proposed frequency stabilization means, including a laser light source by a laser and a temperature controller and a current source thereof; discriminator composed of acetylene gas absorption chamber; a light detector, the phase lock amplifier, the signal source driving source and high voltage servo feedback control thereof; wherein the fiber grating external cavity semiconductor lasers of said quantum well laser made of die FP semiconductor laser and a fiber grating, wherein the semiconductor laser coupling end faces of the die and the fiber grating is antireflection coated and the other end of the fiber grating has a collimator connected, both ends of the fiber grating are also connected two end-connected to the piezoelectric ceramic; said servo feedback controller two input terminals of the respective lock-in amplifier with said one end of said light detector output and the signal source connected to the output of the lock-in amplifier connected to one end of the high pressure drive source, the drive source and a high voltage signal the other end of the source are connected to said two piezoelectric ceramic; optical path between the collimator and acetylene gas absorption chamber further provided with a separator 一部分反射镜。 A portion of the mirror.

本发明提出的上述光纤光栅外腔半导体激光器的稳频方法,包括以下步骤:1、接通激光器电源,调节激光器注入电流和激光器温度,使激光器工作在外腔激光器波长与相邻管芯内腔模式之间的波长间隔为内腔模式间隔的一半处的最佳工作点,以使激光器的输出功率和频率达到最稳定;2、接通伺服反馈控制器电源,并且使伺服反馈控制器处于开环工作状态;3、调节光纤光栅调谐器中压电陶瓷上的电压,也就是调谐激光器输出波长,进行乙炔吸收峰频率搜索,同时检测光探测器的输出信号和从中提取的2倍频信号;4、当检测到探测器输出交流信号最小而其2倍频信号最大时,让伺服反馈控制器处于闭环工作状态,即激光器就进入了稳频状态。 Frequency stabilization method of the optical fiber grating external cavity semiconductor laser proposed by the present invention, comprising the following steps: 1, the laser power is turned to adjust the laser injection current and the laser temperature, laser operating wavelength of the external cavity laser mode adjacent the die lumen a wavelength spacing between the optimum operating point is at half the lumen of the pattern interval, and that the output frequency of the laser power to achieve the most stable; 2, turning on the servo power feedback controller, the feedback controller and the servo loop is open working condition; 3, adjust the voltage on the piezoelectric ceramic fiber grating tuner, which is tunable laser output wavelength, the absorption peak of an output signal frequency search ethynyl, while the detection light detector 2 and the frequency signal extracted; 4 , the output AC signal when the detector detects minimum and the maximum signal frequency which is 2, so that a closed loop servo feedback control operating state, i.e., the laser frequency stabilization entered state.

本发明装置的特点在于:采用光纤光栅外腔半导体激光器为激光光源。 Feature of the invention apparatus is characterized in: using fiber grating external cavity semiconductor laser is a laser source. 该激光器与DFB激光器相比,较高频率稳定性和极窄的激光线宽;与体光栅外腔半导体激光器相比,结构简单,而且机械稳定性高。 Compared with the DFB laser of the laser, a high frequency stability and very narrow laser linewidth; compared with the volume grating external cavity semiconductor laser, a simple structure, and high mechanical stability. 所以光纤光栅外腔半导体激光器可作为稳频系统的优质光源。 Therefore, the fiber grating external cavity semiconductor laser as a light source high-frequency stabilization system.

本发明方法特点在于:(1)解决了光纤光栅外腔半导体激光器的波长调谐和交流调制,满足了稳频技术要求的波长信号的搜索、跟踪和鉴频信号的产生与提取,实现了闭环反馈控制。 The method of the present invention is characterized in that: (1) solves the wavelength tuning and AC modulation fiber grating external cavity semiconductor laser, satisfying the search wavelength of the signal frequency stabilization requirements, tracking and generating the extracted frequency discrimination signal to achieve a closed-loop feedback control. 因为光纤光栅外腔半导体激光器的激光波长由光纤光栅布拉格波长决定,所以改变激光器注入电流和改变外腔长度都不能有效的实现其的频率控制。 Because the laser wavelength fiber grating external cavity semiconductor lasers is determined by the fiber grating Bragg wavelength, varying the laser injection current and external cavity length can not change the effective frequency control thereof. 同样的道理,通过电流调制实现激光器频率调制对光纤光栅外腔半导体激光器也不适用。 Similarly, to achieve modulation of the laser frequency fiber grating external cavity semiconductor laser is modulated by a current does not apply. 因此要想实现这种优质光源的稳频,需要采取其它方法。 Therefore, in order to achieve such a high frequency stabilization of the light source, the need for other methods. 光纤光栅外腔半导体激光器的输出波长由光栅布拉格波长决定,本发明通过用压电陶瓷对光纤光栅调谐实现了光纤光栅外腔半导体激光光源的频率控制。 The output wavelength of the fiber grating external cavity semiconductor laser is determined by the Bragg wavelength of the grating, and a piezoelectric fiber grating tuning frequency control to achieve fiber grating external cavity semiconductor laser light source by the present invention. 另外为了获得鉴频误差信号,需要对激光器输出频率进行调制,采用在压电陶瓷上加载交流电压使光纤光栅产生振动,从而对光栅周期实现调制,使得激光频率获得频率调制的;(2)找到稳频激光器的最佳工作点,即外腔激光器波长与相邻管芯内腔模式之间的波长间隔为内腔模式间隔的一半。 Further in order to obtain an error signal discriminator, the need for frequency modulating the laser output using ac voltage applied on the optical fiber grating piezoelectric vibration, in order to achieve modulation of the grating period, so that the laser frequency to obtain the frequency modulation; (2) Found optimal operating point frequency stabilized laser, i.e., the external cavity laser wavelength between the wavelength and the core cavity mode spacing adjacent tubes half lumen mode interval. 通过调整激光器工作电流和温度获得最佳工作点,提高了系统的信噪比,使稳频激光器能够长期稳定运行。 Obtained by adjusting the operating current and the laser temperature optimum operating point, to improve the signal to noise ratio of the system, so that the laser frequency stabilized long-term stable operation.

本实施例选定的激光光源由量子阱FP型半导体激光管芯和一只长1厘米的光纤光栅1构成,其中半导体激光管芯与光纤光栅的耦合端面镀有90%的增透膜6,以消除内腔模式振荡,整个外腔激光器全长20cm;光纤光栅反射率应在10~12dB之间,3dB反射带宽约0.3nm,光纤光栅是利用Ar离子腔内倍频激光器产生的紫外激光照射,模板写入法获得的,装在调谐机构上的光纤光栅布拉格波长为1530.15nm,比稳频后的工作波长即乙炔在1530.37nm的吸收峰小0.2nm左右;光栅与管芯的耦合效率为50%。 Example laser light source is selected according to the present embodiment is constituted by a quantum well type semiconductor laser die FP 1 cm and a length of a fiber grating, wherein the semiconductor laser and the die end face of the fiber grating coupling is plated with 90% of the antireflection film 6, to remove the lumen-mode oscillation, the entire full-length 20cm external cavity laser; s reflectivity should be between 10 ~ 12dB, 3dB reflection bandwidth of about 0.3nm, the fiber grating is irradiated using an ultraviolet laser intracavity frequency doubled Ar-ion laser produced , the obtained template writing method, the tuning mechanism mounted on the Bragg wavelength of the FBG 1530.15nm, the operating wavelength than the frequency stabilization acetylene small absorption peak at approximately 1530.37nm 0.2nm; coupling efficiency of the grating and the die 50%.

本实施例的稳频方法的具体步骤为:(1)激光器工作电流设置为60mA,温度设置为20度,微调温度,使光纤光栅外腔半导体激光器工作在最佳工作点,这样做主要因为:激光器镀膜表面残余的反射率使激光器的荧光输出谱仍会有大约3~5dB的内腔膜,而内腔模的存在影响外腔激光器的功率输出稳定性,只有当外腔激光器波长与相邻管芯内腔模式之间的波长间隔为内腔模式间隔的一半时激光功率和频率才能最稳定,这就是光纤光栅外腔半导体激光器的最佳工作点,可以在其附近实现频率控制和调制,这时激光器输出功率为1mW,工作波长为1530.37nm。 DETAILED step frequency stabilization method of this embodiment are: (1) laser operating current is set to 60mA, the temperature is set to 20 degrees, the temperature fine adjustment, the optical fiber grating external cavity semiconductor lasers work at the optimum operating point, this is mainly due to: laser surface coating the phosphor the residual reflectivity of the laser output spectrum will still have a lumen of about 3 ~ 5dB film, and the presence of lumen modes affects the power output of the external cavity laser stability, only when the external cavity laser wavelength and the adjacent wavelengths between die inner cavity mode spacing pattern interval of half a lumen laser power and frequency to the most stable, this is the optimum operating point fiber grating external cavity semiconductor laser, and a modulation frequency control can be achieved in the vicinity thereof, In this case the laser output power of 1mW, the operating wavelength of 1530.37nm.

(2)接通反馈伺服系统电源,并打开开关7,使其工作在开环状态,即反馈控制信号不作用在光纤光栅调谐机构上。 (2) feedback servo power is turned on, and switch 7 to operate in open loop, i.e. a feedback control signal is not applied to the fiber grating tuning means. 伺服系统的信号源产生的1KHz交流信号作用在压电陶瓷3上,压电陶瓷3的振动作用在光纤光栅上,使激光器输出光得到频率调制。 1KHz AC signal is applied to the servo system signal source is generated in the piezoelectric ceramics 3, vibration acting on the piezoelectric ceramic fiber grating 3, the output of the laser light to obtain frequency modulation. 激光器输出光经准直器4后变为空间平行光。 The collimated laser output rear space 4 becomes parallel light. 为了防止其它地方的反射光进入外腔激光器,在光路中插入一个隔离器。 In order to prevent reflected light from entering the rest of the external cavity laser, an isolator is inserted in the optical path. 经过隔离器的光被部分反射镜5分为两束光,一束光作为稳频系统输出光,另一束光作为鉴频器输入光,该束光穿过乙炔吸收室。 After the optical isolator is partially reflecting mirror 5 into two beams, one beam frequency stabilization system as output light, a beam of light as the other input light frequency discriminator, the beam passes through the absorption chamber acetylene. 频率被调制的激光经乙炔吸收室后,激光与乙炔吸收峰中心频率的偏离量被转化为光强调制信号,该信号被光电探测器接收。 Deviation amount of the laser frequency is modulated by the absorption chamber acetylene, and acetylene absorption peak laser center frequency is converted to optical intensity modulation signal, which is received by the photodetector.

(3)进行乙炔吸收峰中心波长搜索。 (3) were acetylene absorption center wavelength search. 逐步改变压电陶瓷2上的电压,使激光器输出波长向已炔吸收峰移动,观测光探测器的输出信号和从中提取的2倍频信号;当检测到探测器输出交流信号最小而其2倍频信号最大,这时激光器输出波长正好在乙炔吸收峰中心波长处。 Gradually changing the voltage on the piezoelectric ceramic 2, the laser output wavelength peak shifts, the output signal of the photodetector and the observed frequency signal extracted from the 2 to the absorbent has alkynyl; output AC signal when the detector detects minimum and 2 times the maximum signal frequency, then the laser output wavelength exactly in the center of the peak at an absorption wavelength of acetylene.

(4)闭合开关7,让伺服反馈控制器处于闭环工作状态,即激光器就进入了稳频状态。 (4) closes the switch 7, so that a closed loop servo feedback control operating state, i.e., the laser frequency stabilization entered state. 探测器输出电信号和1KHz信号源输出信号送入锁相放大器,得到误差控制信号,该信号再经过高压驱动器放大,作用在压电陶瓷2上。 Electrical detector output signal and the 1KHz into the lock-in amplifier output signal source, to obtain a control error signal, the drive signal is then amplified through a high pressure acting on the piezoelectric ceramic 2. 光纤光栅在压电陶瓷2的伸缩下调整光栅周期,从而实现激光器的频率控制。 FBG grating period at the telescopic adjustment of the piezoelectric ceramic 2 to laser frequency control.

本发明可广泛用于各种参考频率的光纤光栅外腔半导体激光器的稳频技术,也可以单独用于单模、窄线宽、可调谐半导体激光器的光源。 The present invention can be widely used reference frequency fiber grating external cavity semiconductor laser frequency stabilization technique may be used to separate single-mode, narrow linewidth tunable semiconductor laser source.

Claims (2)

1.一种光纤光栅外腔半导体激光稳频装置,包括由激光器及其温度控制器和电流源组成的激光光源;由乙炔气体吸收室构成的鉴频器;由光探测器,锁相放大器和信号源和高压驱动源组成的伺服反馈控制器;其特征在于,所说的激光器由量子阱FP型半导体激光管芯和一支光纤光栅构成的光纤光栅外腔半导体激光器,其中该半导体激光管芯与光纤光栅的耦合端面镀有增透膜,光纤光栅的另一端连有一准直器,该光纤光栅两端还连接有两块首尾相连的压电陶瓷;所说的伺服反馈控制器中的锁相放大器的两个输入端分别与所说的光探测器输出端和所说的信号源的一端相连,该锁相放大器的输出端连于高压驱动源的一端,该高压驱动源和信号源的另一端分别与所说的两块压电陶瓷相连;在该准直器与乙炔气体吸收室之间的光路上还设有一隔离器和一部分反射 A fiber grating external cavity semiconductor laser frequency stabilization means comprise a laser light source by a laser and a temperature controller and a current source thereof; discriminator composed of acetylene gas absorption chamber; a photodetector, lock-in amplifier, and high voltage source and a drive source composed of a servo feedback controller; wherein the fiber grating external cavity semiconductor lasers of said quantum well laser made of die FP semiconductor laser and a fiber grating, wherein the semiconductor laser die coupling end faces of the fiber grating has an AR coating, the other end of the fiber grating has a collimator attached, the ends of the fiber grating are also connected two end-connected to the piezoelectric ceramic; said lock servo feedback controller two input terminal of the amplifier respectively with said photodetector output and an end of said signal source is connected to the output of the lock-in amplifier connected to one end of the high pressure drive source, the drive source and a high voltage signal source the other end coupled to said two piezoelectric ceramic; optical path between the collimator and acetylene gas absorption chamber further provided with a spacer and a portion of the reflective 镜。 mirror.
2.一种用于光纤光栅外腔半导体激光器的稳频方法,包括以下步骤:1)接通激光器电源,调节激光器注入电流和激光器温度,使激光器工作在外腔激光器波长与相邻管芯内腔模式之间的波长间隔为内腔模式间隔的一半处的最佳工作点,以使激光器的输出功率和频率达到最稳定;2)接通饲服反馈控制器电源,并且使饲服反馈控制器处于开环工作状态;3)调节光纤光栅调谐器中压电陶瓷上的电压,调谐激光器输出波长,进行乙炔吸收峰频率搜索,同时检测光探测器的输出信号和从中提取的2倍频信号;4)当检测到探测器输出交流信号最小而其2倍频信号最大时,让饲服反馈控制器处于闭环工作状态,即激光器进入稳频状态。 A frequency stabilization method of fiber grating external cavity semiconductor laser, comprising the steps of: 1) switching on the laser power, adjust the laser injection current and the laser temperature, laser operating wavelength of the external cavity laser with a core cavity adjacent tubes a wavelength spacing between the modes at the optimum operating point is half the pattern interval of the lumen, so that the frequency of the laser output power and to achieve the most stable; 2) Servo feedback controller power supply is turned on, and the feedback controller Servo in an open loop state; 3) adjusting the voltage on the piezoelectric ceramic fiber grating tuner, tuning the laser output wavelength, frequency search for acetylene absorption peak, while detection output signal 2 and the frequency of the photodetector signal is extracted therefrom; 4) when the output AC signal of the detector detects minimum and the maximum signal frequency which is 2, so that a closed loop feedback controller Servo operating state, i.e., into the laser frequency stabilization state.
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