JPS5575280A - Gas laser device - Google Patents

Gas laser device

Info

Publication number
JPS5575280A
JPS5575280A JP14937878A JP14937878A JPS5575280A JP S5575280 A JPS5575280 A JP S5575280A JP 14937878 A JP14937878 A JP 14937878A JP 14937878 A JP14937878 A JP 14937878A JP S5575280 A JPS5575280 A JP S5575280A
Authority
JP
Japan
Prior art keywords
voltage
discharge current
output voltage
sharply
transistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14937878A
Other languages
Japanese (ja)
Other versions
JPS633476B2 (en
Inventor
Norio Takano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14937878A priority Critical patent/JPS5575280A/en
Publication of JPS5575280A publication Critical patent/JPS5575280A/en
Publication of JPS633476B2 publication Critical patent/JPS633476B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/097—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser
    • H01S3/09705—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser with particular means for stabilising the discharge

Abstract

PURPOSE:To prevent a laser tube from damage, causing to an overcurrent in an abnormal state, by providing a discharge current control feedback circuit with a bypass circuit for limiting a discharge current when laser light changes sharply. CONSTITUTION:When dust or the like enters into light resonators 7, 7' or a beam splitter 8 and laser light 13 decreases sharply, by photoelectric output voltage V1 of a light detector 6 falls drastically and the output voltage of a comparison amplifier 3 rises sharply. At that time, a transistor Tr2 is turned on and the discharge current of a laser tube 9 increases sharply. Since the current detection terminal voltage V2 of a resistor 18 rises due to the sharp increase in the discharge current, the difference between the voltage Vs2 of a reference power source 14 and the current detection terminal voltage V2 decreases and the output voltage of another comparison amplifier 19 drops. As a result, the output voltage of the former comparison amplifier 3 is applied to the latter 19 through a resistor 15 and diodes 16, 17, the base voltage of the transistor Tr2 falls and the discharge current of the laser tube 9 decreases. In an abnormal state as mentioned above, the difference between the voltage Vs2, V2 is amplified and then applied to the base of the transistor Tr2 and constant current control is effected to eliminate the difference.
JP14937878A 1978-12-01 1978-12-01 Gas laser device Granted JPS5575280A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14937878A JPS5575280A (en) 1978-12-01 1978-12-01 Gas laser device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14937878A JPS5575280A (en) 1978-12-01 1978-12-01 Gas laser device

Publications (2)

Publication Number Publication Date
JPS5575280A true JPS5575280A (en) 1980-06-06
JPS633476B2 JPS633476B2 (en) 1988-01-23

Family

ID=15473816

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14937878A Granted JPS5575280A (en) 1978-12-01 1978-12-01 Gas laser device

Country Status (1)

Country Link
JP (1) JPS5575280A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62130579A (en) * 1985-12-03 1987-06-12 Ricoh Co Ltd Semiconductor laser driving circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5265479U (en) * 1975-11-08 1977-05-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5265479U (en) * 1975-11-08 1977-05-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62130579A (en) * 1985-12-03 1987-06-12 Ricoh Co Ltd Semiconductor laser driving circuit

Also Published As

Publication number Publication date
JPS633476B2 (en) 1988-01-23

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