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Method for generating stable, full-time low noise laser output

A low-noise, laser-based technology, which is applied to devices for controlling laser output parameters, lasers, phonon exciters, etc., can solve the problem that the output spectrum depends on operating temperature and power supply, and cannot unify and stabilize the illumination area of ​​a wide emission range laser. , to achieve the effect of low optical noise

Active Publication Date: 2013-02-06
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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  • Method for generating stable, full-time low noise laser output
  • Method for generating stable, full-time low noise laser output
  • Method for generating stable, full-time low noise laser output

Examples

Experimental program
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Embodiment 1

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

[0087] Such as Figure 1A As shown, the introduction of the flow chart of the inventive method includes the steps of adjusting and maintaining the operating temperature of the semiconductor laser through a semiconductor refrigerator fixed outside the laser; generating a DC bias voltage from a DC generator, wherein the DC The size of the bias voltage is roughly based on the ratio of the required laser output power to the average slope of the current power curve of the semiconductor laser; a radio frequency signal with adjustable amplitude is generated from the local oscillator; the radio frequency signal is superimposed on the DC bias voltage to generate an amplitude that has been Modulated drive current; inject the mod...

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 refrigerator fixed on the laser, generating a DC bias voltage from a DC generator; generating a radio frequency with adjustable amplitude from a local oscillator signal; overlap RF signal and DC bias to generate amplitude-modulated drive current; inject the drive current after amplitude modulation into the semiconductor laser through the input coupling with matching impedance, and adjust the DC bias through the automatic flow control loop; optimize the RF at the same time signal amplitude.

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

Embodiment 3

[0095] In solid-state laser systems, fluctuating intensity and / or the emission spectrum of the pump laser can shake the light output of the solid-state laser. Pump source with temporal, spectral and spatial stabilization, base reference Figure 3A, the solid-state laser system construction flow chart shown in the present invention, the specific method for making 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 passes through one or more Thermoelectric controllers on diodes to gain medium. A DC generator generates a DC bias voltage, where the DC bias voltage is approximately determined by the ratio of the desired laser output power to the average slope of the semiconductor laser current power curve, from a local oscillator to generate an RF wireless signal of adjustable amplitude, and This frequency is substantially higher than the ...

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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 capable of effectively producing low coherence, low noise, low speckle, long-term stable output power, and long-term uniform beam illumination, and is used in biomedicine, medical diagnosis and clinical Semiconductor laser systems of various wavelengths that produce monochromatic or polychromatic colors required in an application from a single device. Background technique [0002] Many applications of semiconductor laser systems in biomedicine and medical diagnostics and clinically are based on laser-induced fluorescence radiation. The structural properties of the substance are determined by detection of the induced fluorescence. The laser-induced fluorescence process is a photon absorption and conversion process. Irradiating light excites the molecules which then emit longer wavelength light. Since the luminescence spectra of different molecule...

Claims

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Application Information

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Patent Type & Authority Patents(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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