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A method of producing stable full-time low-noise laser output

A low-noise, laser technology, used in devices for controlling laser output parameters, lasers, phonon exciters, etc., can solve the problems of output spectrum dependence on operating temperature and power supply, failure to unify and stabilize the illumination area of ​​wide emission domain lasers, etc. , to achieve the effect of low optical noise

Active Publication Date: 2011-12-21
PAVILION INTEGRATION CORP SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additional challenges with GaN-based lasers come from their strong output spectrum dependence on operating temperature and power supply
Furthermore, prior art fails to unify and stabilize the illuminated area of ​​wide emission range lasers

Method used

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  • A method of producing stable full-time low-noise laser output
  • A method of producing stable full-time low-noise laser output
  • A method of producing stable full-time low-noise laser output

Examples

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Embodiment 1

[0086] This embodiment discloses a low-noise laser module, which realizes stability in time, frequency spectrum, and space by using a radio frequency modulation drive current and optical power control system of a front face photodiode outside the laser assembly.

[0087] Such as Figure 1A As shown, the flow chart of the method of the invention is introduced. The method of the invention includes the steps of adjusting and maintaining the operating temperature of the semiconductor laser through a semiconductor cooler fixed outside the laser; generating a direct current bias from a direct current generator, wherein the direct current The magnitude of the bias voltage is roughly based on the ratio of the required laser output power to the average slope of the semiconductor laser current power curve; an RF signal with adjustable amplitude is generated from the local oscillator; the RF signal is superimposed on the DC bias voltage to generate an amplitude The modulated drive current; in...

Embodiment 2

[0092] This example Figure 2A As shown, the method includes the steps of adjusting and maintaining the operating temperature of the semiconductor laser through a semiconductor cooler fixed on the laser, generating a direct current bias from a direct current generator; generating an adjustable amplitude radio frequency from a local oscillator Signal; superimpose the RF signal and DC bias voltage to generate an amplitude-modulated drive current; inject the amplitude-modulated drive current into the semiconductor laser through an input coupling equipped with matching impedance, and adjust the DC bias voltage through an automatic continuous current control loop; at the same time optimize the RF Signal amplitude.

[0093] Figure 2B Shows the steps of adjusting the DC bias voltage, and further includes sampling the DC current through the current sensing resistor, comparing the sampled current with the reference with a comparator, and adjusting the DC bias according to the comparison r...

Embodiment 3

[0095] In a solid-state laser system, the fluctuating intensity and / or the emission spectrum of the pump laser may shake the light output of the solid-state laser. Stable pump source with time, spectrum and space, reference reference Figure 3A , The solid-state laser system structure flow chart shown in the present invention, the specific method for the diode-pumped solid-state laser full-time low-noise steady-state operation includes the following steps, adjusting and maintaining the operating temperature of the diode, the solid-state laser through one or more The thermoelectric controller on the diode gains the medium. The direct current generator generates a direct current bias voltage, where the direct current bias voltage roughly depends on the ratio of the required laser output power to the average slope of the semiconductor laser current power curve. The local oscillator generates an adjustable amplitude radio frequency wireless telecommunication signal, and This freque...

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Abstract

The invention discloses a method for generating stable, full-time low noise laser output. The method includes the following steps: regulating and maintaining a semiconductor laser operating temperature by means of a thermoelectric controller (TEC) attached on the laser; generating a direct-current bias from a direct-current generator; generating an amplitude-modulatable radio frequency signal from a local oscillator; superposing the radio frequency signal onto the direct-current bias to generate amplitude-modulatable drive current; injecting the amplitude-modulatable drive current into the semiconductor laser by way of input-coupled impedance matching; regulating the direct-current bias by means of an automatic power control circuit; and optimizing the amplitude of the radio frequency signal. By modulating the driving of the semiconductor laser diode, the method effectively overcomes the mode hopping phenomenon, the method is applicable to laser diodes with various wavelengths, the generated laser output has the advantages of low coherence, low noise, little speckles, long-time stable output power and long-time uniform beam illumination, and the method is particularly suitable forbiomedicine and medical diagnosis and clinic.

Description

Technical field [0001] The invention relates to the field of semiconductor lasers, in particular to a semiconductor laser system that can effectively produce low coherence, low noise, low speckle, long-term stable output power and long-term uniform beam illumination, and is used in biomedicine and medical diagnosis and clinical medicine. The monochromatic or multi-color semiconductor laser system of various wavelengths produced in a single device in the application. Background technique [0002] Many applications of semiconductor laser systems in biomedicine and medical diagnosis and clinical applications are based on laser-induced fluorescence radiation. The structural properties of the substance are determined by the detection of the induced fluorescence. The laser-induced fluorescence process is a process of photon absorption and conversion. Irradiation of light excites the molecules and then emits longer wavelength light. Since the luminescence spectra of different molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042H01S5/06H01S5/0683
Inventor 罗宁一何克祥范辉季朝华刘理何骏
Owner PAVILION INTEGRATION CORP SUZHOU
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