Abstract
In this paper, we report on a wavelength modulation He-Ne gas laser with stable output intensity. Wavelength modulation of the laser is achieved by modulating the length of the resonator cavity. And photon tunneling is used to change the loss of the cavity, namely, to modulate the laser output intensity. Then, the closed-loop feedback control technique is adopted to ensure the output intensity is stable when the laser wavelength is being modulated. Photon tunneling shows a significant control effect on the output light intensity of the laser. Finally, compared to a laser without feed-back control, the output stability of the wavelength modulation laser with feed-back control is an order higher in magnitude than that of the former, as average standard deviation of the output intensity decreases to a thirtieth of the original. In addition longitudinal mode characteristics and beam quality of the laser is measured. The measuring results show that it has two longitudinal modes and an excellent beam quality as the value of M2 factor is 1.029.
Highlights
IntroductionAND THEORIESDue to their excellent optical quality, He-Ne gas lasers are widely used in scientific research, high precision measurement, information transmission and processing, medicine, etc.[1,2,3,4,5,6] In some practical applications, for example, absorption spectroscopy, the wavelength and intensity modulations of lasers are needed.[7,8,9,10] Our designed laser has the potential to be applied in this field and may inspire researchers to use this intensity modulation method in other lasers.The laser modulation is categorized into the internal modulation and the external modulation.He-Ne gas lasers have a relatively low gain
From the laser resonance conditions in the cavities, we know this piezoelectric transducers (PZTs) can modulate the wavelength of the output laser
The other PZT is used to push and pull the quartz plate on the prism to modulate the tunneling gap. It can adjust the loss in the process of laser oscillation, which means the output intensity of the laser can be modulated by PZT-1
Summary
AND THEORIESDue to their excellent optical quality, He-Ne gas lasers are widely used in scientific research, high precision measurement, information transmission and processing, medicine, etc.[1,2,3,4,5,6] In some practical applications, for example, absorption spectroscopy, the wavelength and intensity modulations of lasers are needed.[7,8,9,10] Our designed laser has the potential to be applied in this field and may inspire researchers to use this intensity modulation method in other lasers.The laser modulation is categorized into the internal modulation and the external modulation.He-Ne gas lasers have a relatively low gain. Due to their excellent optical quality, He-Ne gas lasers are widely used in scientific research, high precision measurement, information transmission and processing, medicine, etc.[1,2,3,4,5,6] In some practical applications, for example, absorption spectroscopy, the wavelength and intensity modulations of lasers are needed.[7,8,9,10] Our designed laser has the potential to be applied in this field and may inspire researchers to use this intensity modulation method in other lasers. The laser modulation is categorized into the internal modulation and the external modulation. He-Ne gas lasers have a relatively low gain. In most cases, the external modulation is adopted in
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