JPH0248835U

JPH0248835U -

Info

Publication number: JPH0248835U
Application number: JP12895688U
Authority: JP
Priority date: 1988-09-30
Filing date: 1988-09-30
Publication date: 1990-04-04
Anticipated expiration: 2003-09-30
Also published as: JPH0723708Y2

Description

[Brief explanation of drawings]

第１図は本考案に係るレーザ周波数計の第１の
実施例を示す構成ブロツク図、第２図は第１図装
置の動作を示すタイムチヤート、第３図は第１図
装置の動作を説明するための説明図、第４図は第
１図装置の一変形例を示す要部構成ブロツク図、
第５図は本考案に係るレーザ周波数計の第２の実
施例を示すためのタイムチヤート、第６図および
第７図は従来のレーザ周波数計を示す原理図であ
る。１…参照レーザ、２…第１の光学手段、５…フ
アブリ・ペロー・エタロン、６…第２の光学手段
、７…第１の光検出器、８…第２の光検出器、９
…第１のメモリ回路、１０…第２のメモリ回路、
１１，１２…発振器、１３…切換スイツチ、１４
…周波数演算回路、５３…掃引手段、Ｔ，Ｔ_１〜
Ｔ_６…掃引区間。 Fig. 1 is a configuration block diagram showing a first embodiment of the laser frequency meter according to the present invention, Fig. 2 is a time chart showing the operation of the apparatus shown in Fig. 1, and Fig. 3 explains the operation of the apparatus shown in Fig. 1. FIG. 4 is a block diagram showing a modification of the device shown in FIG. 1;
FIG. 5 is a time chart showing a second embodiment of the laser frequency meter according to the present invention, and FIGS. 6 and 7 are principle diagrams showing a conventional laser frequency meter. DESCRIPTION OF SYMBOLS 1... Reference laser, 2... First optical means, 5... Fabry-Perot etalon, 6... Second optical means, 7... First photodetector, 8... Second photodetector, 9
...first memory circuit, 10...second memory circuit,
11, 12... Oscillator, 13... Changeover switch, 14
...Frequency calculation circuit, 53...Sweeping means, T, T ₁ ~
_T6 ...Sweep section.

Claims

[Scope of utility model registration request]

a reference laser whose oscillation frequency is known, a first beam that combines the laser beam to be measured and the output beam of the reference laser;
an optical means, a Fabry-Perot etalon into which the output light of the first optical means is incident, and a light that passes through the Fabry-Perot etalon is separated into the laser beam to be measured and the reference laser beam. a second optical means for detecting the measured laser beam output from the second optical means; a first photodetector for detecting the reference laser beam output from the second optical means; a second photodetector for storing the output of the first photodetector; a first memory circuit for storing the output of the first photodetector; and a second memory circuit for storing the output of the second photodetector.
a memory circuit, a sweep means for minutely changing the mirror spacing of the Fabry-Perot etalon, an oscillation means for driving the sweep means, and a memory circuit based on the first memory circuit output and the second memory circuit output. and a frequency calculation circuit that calculates the frequency of the laser beam to be measured, and the oscillation means is configured such that the mirror interval is swept at a lower sweep speed than other sweep periods in a sweep section in which the frequency calculation circuit measures a fraction of the sweep distance. A laser frequency meter characterized by the following configuration.