CN1101609C - Quick-tuned optical parametric oscillator - Google Patents

Quick-tuned optical parametric oscillator Download PDF

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Publication number
CN1101609C
CN1101609C CN 97123362 CN97123362A CN1101609C CN 1101609 C CN1101609 C CN 1101609C CN 97123362 CN97123362 CN 97123362 CN 97123362 A CN97123362 A CN 97123362A CN 1101609 C CN1101609 C CN 1101609C
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positive lens
spherical reflector
beam deflector
parametric oscillator
optical parametric
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CN 97123362
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CN1195213A (en
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张雨东
毛宏伟
谢发利
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Fujian Institute of Research on the Structure of Matter of CAS
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Fujian Institute of Research on the Structure of Matter of CAS
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Priority claimed from CN96122191A external-priority patent/CN1186364A/en
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  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The present invention relates to a quick optical parameter tuning oscillator. The pumping light beam (1) of the present invention firstly passes through a light beam deflector (2) with an adjustable angle; after the pumping light beam (1) passes through a telescopic system which is composed of a positive lens (3) and a positive lens (4) or a spherical reflector (9) and a spherical reflector (10), the pumping light beam (1) penetrates through an OPO cavity mirror (5) to be projected on a nonlinear optical crystal (6), and then, the tuning lasers of the OPO cavity mirror (5) are output from a cavity mirror (7). An acoustooptic deflector, an electrooptical deflector or a PZT vibration mirror is used as a pumping light beam deflector; thus, the deflection angle of pumping light can be accurately controlled, and the deflection angle of the pumping light can be quickly changed. Thereby, the wavelength of an optical parametric oscillator (OPO) can be accurately and quickly tuned, and the tuning speed is improved by more than two orders of magnitude.

Description

Quick-tuned optical parametric oscillator
The present invention relates to field of optoelectronic devices, relate in particular to the solid tuned laser.
Optical parametric oscillator (OPO) is the present the wideest a kind of solid state laser of tuning range in the world, because of its compact conformation, plurality of advantages such as easy to use and power is high, and the wavelength coverage is wide has been widely used in each scientific research field (new material, biological, chemistry, resonance spectrum etc.), optical parametric oscillator (OPO) mainly adopts crystal angle tuning and two kinds of methods of thermal tuning in the world at present, their major defect is that the speed of wavelength shift is very slow, and is general all below 1Hz.Carried out the research of voltage tuning in the world, this method tuned speed is very fast, but because of limited by existing material property, the broadness of tuning of realization is very narrow, than the little several magnitude of optical parametric oscillator (OPO) of angle tuning and two kinds of methods of thermal tuning.Document " Stabilization and tuning of a doubly resonant optical parametericoscillator " (author: D.Lee and N.C.Wong, periodical: Journal of OpticalSociety of America. (B), Vol.10 No.10/Sept.1993) has all done research to these three kinds of methods.Particularly adopt the OPO of continuous locking mold laser as pumping source, be present broad tuning psec (ps) and femtosecond (fs) the coherent source----psec and the femtosecond synchronous pump OPO of extensive use in the world, it has pulse width, output covers spectral region wide (from near-infrared～ultraviolet), full characteristics of solidifying, the wavelength tuning of this OPO mainly is to realize by angle tuning (stepper motor driving) and pump light source wavelength tuning in the world at present, the tuned speed of these two kinds of methods very low (1Hz is following), can't give full play to the high advantage of continuous locking mold laser repetition rate (as Ti:sapphire self mode locked fs laser, repetition rate is～80MHz).(author: hair is grand for document " angle tuning femtosecond synchronous pump KTP infrared light parametric oscillator ", periodical: Chinese laser, Vol.A22, No.12, Dec.1995, P902.) and " synchronous pump intracavity frequency doubling femtosecond KTP optical parametric oscillator " (author: hair is grand, periodical: Chinese laser, Vol.16, No.4, April 1996, P465.) introduced this two kinds of tuning methods.
The objective of the invention is to make a kind of new optical wavelength quick-tuned optical parametric oscillator, under the prerequisite that broadness of tuning is reduced significantly, realize that the optical parametric oscillator optical wavelength is tuning fast.
Realize that technical scheme of the present invention is, the pump beam of optical parametric oscillator OPO (1), earlier through an adjustable angle beam deflector (2), behind the telescopic system via lens (3) and (4) or spherical reflector (9) and (10) composition, see through OPO chamber mirror (5), be projeced on the nonlinear optical crystal (6), the tuning laser of OPO is exported by chamber mirror (7); Perhaps pump beam (1) projects on the nonlinear optical crystal (6) but pass through coupled mirrors (8) without chamber mirror (5); Perhaps with optical parametric oscillator OPO vibration chamber mirror deielectric-coating, directly be plated on two the logical light face A and B of crystal (6), two of crystal (6) logical light faces have just constituted the required resonant cavity of laser generation like this, pump beam (1), earlier through an adjustable angle beam deflector (2), via lens (3), behind the telescopic system that (4) or spherical reflector (9) and (10) are formed, logical light face A through crystal (6) projects on the nonlinear optical crystal (6).For synchronous pump optical parametric oscillator OPO, its chamber type adopts by level crossing (5) and (7), the four mirror refrative cavities that spherical mirror (11) and (12) are formed, the pump beam of optical parametric oscillator OPO (1), earlier through an adjustable angle beam deflector (2), behind the telescopic system via lens (3) and (4) or spherical reflector (9) and (10) composition, from by level crossing (5) and (7), a side outside spherical mirror (11) in the four mirror refrative cavities that spherical mirror (11) and (12) are formed or (12) chamber, project on the nonlinear optical crystal (6), one of level crossing (5) and (7) can be used as the output cavity mirror, can also compensate group velocity dispersion with a pair of dispersion compensation prism (13) and (14) in the chamber.
The OPO of this programme is configured to non-colinear coupling, and beam deflector (2) makes pump beam different with the angle of nonlinear optical crystal (6) optical axis among the OPO, the coherent light wavelength difference of OPO output then, thereby realization wavelength tuning.In other words, this programme is by beam deflector (2), change the angle of pump light and nonlinear optical crystal (6) optical axis, realizes wavelength tuning.Because beam deflector (2) can change the angle of pump light and nonlinear optical crystal (6) optical axis fast, like this, the OPO optical wavelength of exporting from the logical light face B of output cavity mirror (7) or crystal (6) just can realize tuning fast.
The beam deflector of adjustable angle (2) can be an acousto-optic deflection device, electro-optic deflector, and piezoelectric ceramic (PZT) galvanometer.Acousto-optic deflection device is a kind of light deflector spare that utilizes the photoelastic effect manufacturing of optical material, add a ultrasonic wave at acousto-optic crystal and light beam through on the perpendicular direction, the acousto-optic crystal body is inherent will to produce a refractive-index grating with light beam through perpendicular direction, thereby the Bragg diffraction that causes light makes direction of beam propagation deflection, added ultrasonic frequency difference, then light deflection angle difference; Electro-optic deflector is a kind of light deflector spare that utilizes the electrooptic crystal electro optic effect to make, when this electrooptic crystal is applied in an electric field, the non-ordinary light of crystal and the refractive index of ordinary light can change with the applied field Strength Changes, the electro-optic deflector of being made by one or more pairs of leg-of-mutton electrooptic crystals, the beam deflection angle by electro-optic deflector is with the applied field Strength Changes.(list of references: fowler V.J.and J.Schlafer, " A survey of laser beam deflection techniques ", Proc.IEEE, 54,1437 (1966)).Piezoelectric ceramic (PZT) galvanometer is that a kind of piezoelectric ceramic (PZT) that utilizes has the light deflector spare that the field causes the flex effect manufacturing, with piezoelectric ceramic as one of three feets, be installed in a plane mirror back side, when institute's making alive on the piezoelectric ceramic changes, piezoelectric ceramic feet length changes, make the minute surface tilt variation, thereby make beam deflection angle through this direct reflection with the applied field Strength Changes.
Adopt acousto-optic deflection device, electro-optic deflector, or galvanometer has two advantages as the pump beam deflector, and one can accurately control the pump light deflection angle; Two can change the pump light deflection angle fast; Thereby the wavelength of realizing optical parametric oscillator (OPO) is accurately with tuning fast, and tuned speed improves two more than the order of magnitude.In addition, broadness of tuning is more smaller than crystal angle tuning and two kinds of methods of thermal tuning, but is same magnitude.This optical wavelength quick tuning laser device will be scientific research, and national defence and optical communication provide a kind of brand-new instrument.
Below drawing is made brief description, Fig. 1 is the quick-tuned optical parametric oscillator structural representation of pump beam through transmission-type telescope and chamber mirror; Fig. 2 is a pump beam through the transmission-type telescope, but without the quick-tuned optical parametric oscillator structural representation of chamber mirror; Fig. 3 is the quick-tuned optical parametric oscillator structural representation of pump beam through autocollimator and chamber mirror; Fig. 4 is with optical parametric oscillator OPO vibration chamber mirror deielectric-coating, directly is plated in two logical light face A of crystal (6) and the quick-tuned optical parametric oscillator structural representation on the B; Fig. 5 is quick tuning synchronous pump oscillator (OPO) structural representation; Fig. 6 is the quick-tuned optical parametric oscillator position matching curves that adopts bbo crystal.
Embodiment 1, and as shown in Figure 1, the pump beam of OPO (1) enters by positive lens (3) and (4) and forms a telescopic system behind beam deflector (2); Through the Effect of Back-Cavity Mirror (5) of optical parametric oscillator (OPO), be projeced on the nonlinear optical crystal (6), (7) are the output cavity mirrors of OPO; F1 is a bit of lens (3) front, and F2 is the back focus of lens (3) and the front focus of lens (4), and F3 is a bit of lens (4) back, and F1 and F3 are a pair of conjugation picture points that telescopic system is formed in positive lens (3) and (4); Beam deflector (2) is positioned at a F1 place, and nonlinear optical crystal BBO (6) overlaps with some F3; Change the deflection angle of pump light (1) fast and accurately with beam deflector (2),, just can realize fast and accurately tuning from the OPO optical wavelength of output cavity mirror (7) output.Fig. 6 has provided quick-tuned optical parametric oscillator position matching curves, θ among the figure 1Be the cutting angle of crystal, θ 3Be the angle of the pump light and the optical axis of crystal, curve is that pump light is 532 nanometers shown in the circle real point, and second-order non-linear optical crystal (6) is a cutting angle when being 22.8 ° bbo crystal, the curve of OPO output light-wave personal attendant pump light variable angle; Curve shown in the Fang Shidian is that pump light is 354.7 nanometers, and second-order non-linear optical crystal (6) is a cutting angle when being 28 ° bbo crystal, the curve of OPO output light-wave personal attendant pump light variable angle.
Embodiment 2, as shown in Figure 2, the pump beam of OPO (1) is behind beam deflector (2), enter a telescopic system of forming by positive lens (3) and (4), Effect of Back-Cavity Mirror (5) without optical parametric oscillator (OPO), and directly through pump beam coupled mirrors (8), be projeced on the nonlinear optical crystal (6), (7) are the output cavity mirrors of OPO; F1 be lens (3) front a bit, F2 is the back focus of lens (3) and the front focus of lens (4), F3 be lens (4) back a bit, F1 and F3 are a pair of conjugation picture points of the telescopic system formed of positive lens (3) and (4); Beam deflector (2) is positioned at a F1 place, and nonlinear optical crystal BBO (6) overlaps with some F3; Change the deflection angle of pump light (1) fast and accurately with beam deflector (2),, just can realize fast and accurately tuning from the OPO optical wavelength of output cavity mirror (7) output.
Embodiment 3, and as shown in Figure 3, the pump beam of OPO (1) enters a telescopic system of being made up of spherical reflector (9) and (10) behind beam deflector (2); Through the Effect of Back-Cavity Mirror (5) of optical parametric oscillator (OPO), be projeced on the nonlinear optical crystal (6), (7) are the output cavity mirrors of OPO; Along the pump light direction of propagation, F1 is a bit of spherical reflector (9) front, and F2 is the back focus of spherical reflector (9) and the front focus of spherical reflector (10), and F3 is a bit of spherical reflector (10) back; F1 and F3 are a pair of conjugation picture points of the telescopic system formed of spherical reflector (9) and (10); Beam deflector (2) is positioned at a F1 place, and nonlinear optical crystal BBO (6) overlaps with some F3; Change the deflection angle of pump light (1) fast and accurately with beam deflector (2),, just can realize fast and accurately tuning from the OPO optical wavelength of output cavity mirror (7) output.
Embodiment 4, and as shown in Figure 4, the pump beam of OPO (1) enters a telescopic system of being made up of positive lens (3) and (4) [or spherical reflector (9) and (10)] behind beam deflector (2); Logical light face A through crystal (6) projects on the nonlinear optical crystal (6), and the logical light face A plating of crystal (6) is deielectric-coating anti-reflection and that oscillation light is all-trans to pump light (1), as the Effect of Back-Cavity Mirror of optical parametric oscillator; The deielectric-coating that the logical light face B plating of crystal (6) partly sees through the partial reflection to oscillation light is as the outgoing mirror of optical parametric oscillator; F1 is a bit of lens (3) [or spherical reflector (9)] front, F2 is the back focus of lens (3) [or spherical reflector (9)] and the front focus of lens (4) [or spherical reflector (10)], F3 be lens (4) [or spherical reflector (10)] back a bit, F1 and F3 are a pair of conjugation picture points of the telescopic system formed of positive lens (3) and (4) [or spherical reflector (9) and (10)]; Beam deflector (2) is positioned at a F1 place, and nonlinear optical crystal BBO (6) overlaps with some F3; Change the deflection angle of pump light (1) fast and accurately with beam deflector (2), from the output cavity mirror, i.e. the OPO optical wavelength of nonlinear optical crystal (6) B face output just can realize fast and accurately tuning.The oscillation threshold of this OPO is very low, and does not have chamber mirror mismatch and longitudinal mode problem of unstable, and the structure of OPO is very compact small and exquisite, can realize fast with accurately tuning wavelength simultaneously.
Embodiment 5, as shown in Figure 5, the pump beam (1) of quick tuning synchronous pump optical parametric oscillator (OPO) is behind beam deflector (2), enter a telescopic system of forming by positive lens (3) and (4) [or spherical reflector (9) and (10)], the chamber type of synchronous pump optical parametric oscillator (OPO) adopts by level crossing (5) and (7), the four mirror refrative cavities that spherical mirror (11) and (12) are formed, pump beam (1) from four mirror refrative cavities spherical mirror (11) or (12) chamber outside a side, project on the nonlinear optical crystal (6), the deielectric-coating anti-reflection and that oscillation light is all-trans to pump light will be plated in spherical mirror (11) or (12), and level crossing (5) or (7) are as the output cavity mirror.F1 is a bit of lens (3) [or spherical reflector (9)] front, F2 is the back focus of lens (3) [or spherical reflector (9)] and the front focus of lens (4) [or spherical reflector (10)], F3 be lens (4) [or spherical reflector (10)] back a bit, F1 and F3 are a pair of conjugation picture points of the telescopic system formed of positive lens (3) and (4) [or spherical reflector (9) and (10)] and spherical mirror (11) or (12); Beam deflector (2) is positioned at a F1 place, and nonlinear optical crystal BBO (6) overlaps with some F3; Change the deflection angle of pump light (1) fast and accurately with beam deflector (2), OPO optical wavelength from output cavity mirror (5) or (7) output, just can realize fast and accurately tuning, compensate group velocity dispersion with a pair of dispersion compensation prism (13) and (14) in the chamber in.

Claims (8)

1. quick-tuned optical parametric oscillator, it is characterized in that, this optical parametric oscillator is by pump light beam deflector (2), first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10), the first chamber mirror (5) and the second chamber mirror (7), nonlinear optical crystal (6) is formed, and its beam deflector (2) and nonlinear optical crystal (6) lay respectively at a pair of conjugation picture point of the telescopic system that first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10) formed.
2. quick-tuned optical parametric oscillator, it is characterized in that, this optical parametric oscillator is by pump light beam deflector (2), first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10), the first chamber mirror (5) and the second chamber mirror (7), pump light coupled mirrors (8), nonlinear optical crystal (6) is formed, and its beam deflector (2) and nonlinear optical crystal (6) lay respectively at a pair of conjugation picture point of the telescopic system that first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10) formed.
3. quick-tuned optical parametric oscillator, it is characterized in that, this optical parametric oscillator is by pump light beam deflector (2), first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10), the nonlinear optical crystal (6) of preceding logical optical surface (A) and the logical required deielectric-coating of optical surface (B) light-plated parametric oscillator resonant cavity in back is formed, and preceding logical optical surface (A) plating to pump light (1) deielectric-coating anti-reflection and that oscillation light is all-trans, logical optical surface (B) plating in the back deielectric-coating that partial reflection partly sees through to oscillation light; Its beam deflector (2) and nonlinear optical crystal (6) lay respectively at a pair of conjugation picture point of the telescopic system that first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10) formed.
4. quick-tuned optical parametric oscillator, it is characterized in that, this optical parametric oscillator is by pump light beam deflector (2), first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10), the first planar cavity mirror (5) and the second planar cavity mirror (7), the first sphere chamber mirror (11) and the second sphere chamber mirror (12), the first dispersion compensation prism (13) and the second dispersion compensation prism (14), nonlinear optical crystal (6) is formed, and its beam deflector (2) and nonlinear optical crystal (6) lay respectively at a pair of conjugation picture point of the telescopic system that first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10) and the first sphere chamber mirror (11) or the second sphere chamber mirror (12) formed.
5. as claim 1 or 2 or 3 or 4 described quick-tuned optical parametric oscillators, it is characterized in that said beam deflector (2) is an acousto-optic deflection device.
6. as claim 1 or 2 or 3 or 4 described quick-tuned optical parametric oscillators, it is characterized in that said beam deflector (2) is an electro-optic deflector.
7. as claim 1 or 2 or 3 or 4 described quick-tuned optical parametric oscillators, it is characterized in that said beam deflector (2) is a piezoelectric ceramic (PZT) galvanometer.
8. as claim 1 or 2 or 3 or 4 described quick-tuned optical parametric oscillators, it is characterized in that said first positive lens (3) and second positive lens (4) or first spherical reflector (9) and second spherical reflector (10) are telescopic systems.
CN 97123362 1996-12-21 1997-12-08 Quick-tuned optical parametric oscillator Expired - Fee Related CN1101609C (en)

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CN96122191.7 1996-12-21
CN96122191A CN1186364A (en) 1996-12-21 1996-12-21 Quick tuning optical parametric oscillator
CN 97123362 CN1101609C (en) 1996-12-21 1997-12-08 Quick-tuned optical parametric oscillator

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